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/tags/2.8/wp-includes/comment.php

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PHP | 1642 lines | 823 code | 235 blank | 584 comment | 232 complexity | e1b4fa811cd039653d9f14f56eb252a5 MD5 | raw file

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   1<?php
   2/**
   3 * Manages WordPress comments
   4 *
   5 * @package WordPress
   6 * @subpackage Comment
   7 */
   8
   9/**
  10 * Checks whether a comment passes internal checks to be allowed to add.
  11 *
  12 * If comment moderation is set in the administration, then all comments,
  13 * regardless of their type and whitelist will be set to false. If the number of
  14 * links exceeds the amount in the administration, then the check fails. If any
  15 * of the parameter contents match the blacklist of words, then the check fails.
  16 *
  17 * If the number of links exceeds the amount in the administration, then the
  18 * check fails. If any of the parameter contents match the blacklist of words,
  19 * then the check fails.
  20 *
  21 * If the comment is a trackback and part of the blogroll, then the trackback is
  22 * automatically whitelisted. If the comment author was approved before, then
  23 * the comment is automatically whitelisted.
  24 *
  25 * If none of the checks fail, then the failback is to set the check to pass
  26 * (return true).
  27 *
  28 * @since 1.2.0
  29 * @uses $wpdb
  30 *
  31 * @param string $author Comment Author's name
  32 * @param string $email Comment Author's email
  33 * @param string $url Comment Author's URL
  34 * @param string $comment Comment contents
  35 * @param string $user_ip Comment Author's IP address
  36 * @param string $user_agent Comment Author's User Agent
  37 * @param string $comment_type Comment type, either user submitted comment,
  38 *		trackback, or pingback
  39 * @return bool Whether the checks passed (true) and the comments should be
  40 *		displayed or set to moderated
  41 */
  42function check_comment($author, $email, $url, $comment, $user_ip, $user_agent, $comment_type) {
  43	global $wpdb;
  44
  45	if ( 1 == get_option('comment_moderation') )
  46		return false; // If moderation is set to manual
  47
  48	if ( get_option('comment_max_links') && preg_match_all("/<[Aa][^>]*[Hh][Rr][Ee][Ff]=['\"]([^\"'>]+)[^>]*>/", apply_filters('comment_text',$comment), $out) >= get_option('comment_max_links') )
  49		return false; // Check # of external links
  50
  51	$mod_keys = trim(get_option('moderation_keys'));
  52	if ( !empty($mod_keys) ) {
  53		$words = explode("\n", $mod_keys );
  54
  55		foreach ( (array) $words as $word) {
  56			$word = trim($word);
  57
  58			// Skip empty lines
  59			if ( empty($word) )
  60				continue;
  61
  62			// Do some escaping magic so that '#' chars in the
  63			// spam words don't break things:
  64			$word = preg_quote($word, '#');
  65
  66			$pattern = "#$word#i";
  67			if ( preg_match($pattern, $author) ) return false;
  68			if ( preg_match($pattern, $email) ) return false;
  69			if ( preg_match($pattern, $url) ) return false;
  70			if ( preg_match($pattern, $comment) ) return false;
  71			if ( preg_match($pattern, $user_ip) ) return false;
  72			if ( preg_match($pattern, $user_agent) ) return false;
  73		}
  74	}
  75
  76	// Comment whitelisting:
  77	if ( 1 == get_option('comment_whitelist')) {
  78		if ( 'trackback' == $comment_type || 'pingback' == $comment_type ) { // check if domain is in blogroll
  79			$uri = parse_url($url);
  80			$domain = $uri['host'];
  81			$uri = parse_url( get_option('home') );
  82			$home_domain = $uri['host'];
  83			if ( $wpdb->get_var($wpdb->prepare("SELECT link_id FROM $wpdb->links WHERE link_url LIKE (%s) LIMIT 1", '%'.$domain.'%')) || $domain == $home_domain )
  84				return true;
  85			else
  86				return false;
  87		} elseif ( $author != '' && $email != '' ) {
  88			// expected_slashed ($author, $email)
  89			$ok_to_comment = $wpdb->get_var("SELECT comment_approved FROM $wpdb->comments WHERE comment_author = '$author' AND comment_author_email = '$email' and comment_approved = '1' LIMIT 1");
  90			if ( ( 1 == $ok_to_comment ) &&
  91				( empty($mod_keys) || false === strpos( $email, $mod_keys) ) )
  92					return true;
  93			else
  94				return false;
  95		} else {
  96			return false;
  97		}
  98	}
  99	return true;
 100}
 101
 102/**
 103 * Retrieve the approved comments for post $post_id.
 104 *
 105 * @since 2.0.0
 106 * @uses $wpdb
 107 *
 108 * @param int $post_id The ID of the post
 109 * @return array $comments The approved comments
 110 */
 111function get_approved_comments($post_id) {
 112	global $wpdb;
 113	return $wpdb->get_results($wpdb->prepare("SELECT * FROM $wpdb->comments WHERE comment_post_ID = %d AND comment_approved = '1' ORDER BY comment_date", $post_id));
 114}
 115
 116/**
 117 * Retrieves comment data given a comment ID or comment object.
 118 *
 119 * If an object is passed then the comment data will be cached and then returned
 120 * after being passed through a filter. If the comment is empty, then the global
 121 * comment variable will be used, if it is set.
 122 *
 123 * If the comment is empty, then the global comment variable will be used, if it
 124 * is set.
 125 *
 126 * @since 2.0.0
 127 * @uses $wpdb
 128 *
 129 * @param object|string|int $comment Comment to retrieve.
 130 * @param string $output Optional. OBJECT or ARRAY_A or ARRAY_N constants.
 131 * @return object|array|null Depends on $output value.
 132 */
 133function &get_comment(&$comment, $output = OBJECT) {
 134	global $wpdb;
 135
 136	if ( empty($comment) ) {
 137		if ( isset($GLOBALS['comment']) )
 138			$_comment = & $GLOBALS['comment'];
 139		else
 140			$_comment = null;
 141	} elseif ( is_object($comment) ) {
 142		wp_cache_add($comment->comment_ID, $comment, 'comment');
 143		$_comment = $comment;
 144	} else {
 145		if ( isset($GLOBALS['comment']) && ($GLOBALS['comment']->comment_ID == $comment) ) {
 146			$_comment = & $GLOBALS['comment'];
 147		} elseif ( ! $_comment = wp_cache_get($comment, 'comment') ) {
 148			$_comment = $wpdb->get_row($wpdb->prepare("SELECT * FROM $wpdb->comments WHERE comment_ID = %d LIMIT 1", $comment));
 149			wp_cache_add($_comment->comment_ID, $_comment, 'comment');
 150		}
 151	}
 152
 153	$_comment = apply_filters('get_comment', $_comment);
 154
 155	if ( $output == OBJECT ) {
 156		return $_comment;
 157	} elseif ( $output == ARRAY_A ) {
 158		$__comment = get_object_vars($_comment);
 159		return $__comment;
 160	} elseif ( $output == ARRAY_N ) {
 161		$__comment = array_values(get_object_vars($_comment));
 162		return $__comment;
 163	} else {
 164		return $_comment;
 165	}
 166}
 167
 168/**
 169 * Retrieve a list of comments.
 170 *
 171 * The comment list can be for the blog as a whole or for an individual post.
 172 *
 173 * The list of comment arguments are 'status', 'orderby', 'comment_date_gmt',
 174 * 'order', 'number', 'offset', and 'post_id'.
 175 *
 176 * @since 2.7.0
 177 * @uses $wpdb
 178 *
 179 * @param mixed $args Optional. Array or string of options to override defaults.
 180 * @return array List of comments.
 181 */
 182function get_comments( $args = '' ) {
 183	global $wpdb;
 184
 185	$defaults = array('status' => '', 'orderby' => 'comment_date_gmt', 'order' => 'DESC', 'number' => '', 'offset' => '', 'post_id' => 0);
 186
 187	$args = wp_parse_args( $args, $defaults );
 188	extract( $args, EXTR_SKIP );
 189
 190	// $args can be whatever, only use the args defined in defaults to compute the key
 191	$key = md5( serialize( compact(array_keys($defaults)) )  );
 192	$last_changed = wp_cache_get('last_changed', 'comment');
 193	if ( !$last_changed ) {
 194		$last_changed = time();
 195		wp_cache_set('last_changed', $last_changed, 'comment');
 196	}
 197	$cache_key = "get_comments:$key:$last_changed";
 198
 199	if ( $cache = wp_cache_get( $cache_key, 'comment' ) ) {
 200		return $cache;
 201	}
 202
 203	$post_id = absint($post_id);
 204
 205	if ( 'hold' == $status )
 206		$approved = "comment_approved = '0'";
 207	elseif ( 'approve' == $status )
 208		$approved = "comment_approved = '1'";
 209	elseif ( 'spam' == $status )
 210		$approved = "comment_approved = 'spam'";
 211	else
 212		$approved = "( comment_approved = '0' OR comment_approved = '1' )";
 213
 214	$order = ( 'ASC' == $order ) ? 'ASC' : 'DESC';
 215
 216	$orderby = 'comment_date_gmt';  // Hard code for now
 217
 218	$number = absint($number);
 219	$offset = absint($offset);
 220
 221	if ( !empty($number) ) {
 222		if ( $offset )
 223			$number = 'LIMIT ' . $offset . ',' . $number;
 224		else
 225			$number = 'LIMIT ' . $number;
 226
 227	} else {
 228		$number = '';
 229	}
 230
 231	if ( ! empty($post_id) )
 232		$post_where = $wpdb->prepare( 'comment_post_ID = %d AND', $post_id );
 233	else
 234		$post_where = '';
 235
 236	$comments = $wpdb->get_results( "SELECT * FROM $wpdb->comments WHERE $post_where $approved ORDER BY $orderby $order $number" );
 237	wp_cache_add( $cache_key, $comments, 'comment' );
 238
 239	return $comments;
 240}
 241
 242/**
 243 * Retrieve all of the WordPress supported comment statuses.
 244 *
 245 * Comments have a limited set of valid status values, this provides the comment
 246 * status values and descriptions.
 247 *
 248 * @package WordPress
 249 * @subpackage Post
 250 * @since 2.7.0
 251 *
 252 * @return array List of comment statuses.
 253 */
 254function get_comment_statuses( ) {
 255	$status = array(
 256		'hold'		=> __('Unapproved'),
 257		/* translators: comment status  */
 258		'approve'	=> _x('Approved', 'adjective'),
 259		/* translators: comment status */
 260		'spam'		=> _x('Spam', 'adjective'),
 261	);
 262
 263	return $status;
 264}
 265
 266
 267/**
 268 * The date the last comment was modified.
 269 *
 270 * @since 1.5.0
 271 * @uses $wpdb
 272 * @global array $cache_lastcommentmodified
 273 *
 274 * @param string $timezone Which timezone to use in reference to 'gmt', 'blog',
 275 *		or 'server' locations.
 276 * @return string Last comment modified date.
 277 */
 278function get_lastcommentmodified($timezone = 'server') {
 279	global $cache_lastcommentmodified, $wpdb;
 280
 281	if ( isset($cache_lastcommentmodified[$timezone]) )
 282		return $cache_lastcommentmodified[$timezone];
 283
 284	$add_seconds_server = date('Z');
 285
 286	switch ( strtolower($timezone)) {
 287		case 'gmt':
 288			$lastcommentmodified = $wpdb->get_var("SELECT comment_date_gmt FROM $wpdb->comments WHERE comment_approved = '1' ORDER BY comment_date_gmt DESC LIMIT 1");
 289			break;
 290		case 'blog':
 291			$lastcommentmodified = $wpdb->get_var("SELECT comment_date FROM $wpdb->comments WHERE comment_approved = '1' ORDER BY comment_date_gmt DESC LIMIT 1");
 292			break;
 293		case 'server':
 294			$lastcommentmodified = $wpdb->get_var($wpdb->prepare("SELECT DATE_ADD(comment_date_gmt, INTERVAL %s SECOND) FROM $wpdb->comments WHERE comment_approved = '1' ORDER BY comment_date_gmt DESC LIMIT 1", $add_seconds_server));
 295			break;
 296	}
 297
 298	$cache_lastcommentmodified[$timezone] = $lastcommentmodified;
 299
 300	return $lastcommentmodified;
 301}
 302
 303/**
 304 * The amount of comments in a post or total comments.
 305 *
 306 * A lot like {@link wp_count_comments()}, in that they both return comment
 307 * stats (albeit with different types). The {@link wp_count_comments()} actual
 308 * caches, but this function does not.
 309 *
 310 * @since 2.0.0
 311 * @uses $wpdb
 312 *
 313 * @param int $post_id Optional. Comment amount in post if > 0, else total comments blog wide.
 314 * @return array The amount of spam, approved, awaiting moderation, and total comments.
 315 */
 316function get_comment_count( $post_id = 0 ) {
 317	global $wpdb;
 318
 319	$post_id = (int) $post_id;
 320
 321	$where = '';
 322	if ( $post_id > 0 ) {
 323		$where = $wpdb->prepare("WHERE comment_post_ID = %d", $post_id);
 324	}
 325
 326	$totals = (array) $wpdb->get_results("
 327		SELECT comment_approved, COUNT( * ) AS total
 328		FROM {$wpdb->comments}
 329		{$where}
 330		GROUP BY comment_approved
 331	", ARRAY_A);
 332
 333	$comment_count = array(
 334		"approved"              => 0,
 335		"awaiting_moderation"   => 0,
 336		"spam"                  => 0,
 337		"total_comments"        => 0
 338	);
 339
 340	foreach ( $totals as $row ) {
 341		switch ( $row['comment_approved'] ) {
 342			case 'spam':
 343				$comment_count['spam'] = $row['total'];
 344				$comment_count["total_comments"] += $row['total'];
 345				break;
 346			case 1:
 347				$comment_count['approved'] = $row['total'];
 348				$comment_count['total_comments'] += $row['total'];
 349				break;
 350			case 0:
 351				$comment_count['awaiting_moderation'] = $row['total'];
 352				$comment_count['total_comments'] += $row['total'];
 353				break;
 354			default:
 355				break;
 356		}
 357	}
 358
 359	return $comment_count;
 360}
 361
 362/**
 363 * Sanitizes the cookies sent to the user already.
 364 *
 365 * Will only do anything if the cookies have already been created for the user.
 366 * Mostly used after cookies had been sent to use elsewhere.
 367 *
 368 * @since 2.0.4
 369 */
 370function sanitize_comment_cookies() {
 371	if ( isset($_COOKIE['comment_author_'.COOKIEHASH]) ) {
 372		$comment_author = apply_filters('pre_comment_author_name', $_COOKIE['comment_author_'.COOKIEHASH]);
 373		$comment_author = stripslashes($comment_author);
 374		$comment_author = esc_attr($comment_author);
 375		$_COOKIE['comment_author_'.COOKIEHASH] = $comment_author;
 376	}
 377
 378	if ( isset($_COOKIE['comment_author_email_'.COOKIEHASH]) ) {
 379		$comment_author_email = apply_filters('pre_comment_author_email', $_COOKIE['comment_author_email_'.COOKIEHASH]);
 380		$comment_author_email = stripslashes($comment_author_email);
 381		$comment_author_email = esc_attr($comment_author_email);
 382		$_COOKIE['comment_author_email_'.COOKIEHASH] = $comment_author_email;
 383	}
 384
 385	if ( isset($_COOKIE['comment_author_url_'.COOKIEHASH]) ) {
 386		$comment_author_url = apply_filters('pre_comment_author_url', $_COOKIE['comment_author_url_'.COOKIEHASH]);
 387		$comment_author_url = stripslashes($comment_author_url);
 388		$_COOKIE['comment_author_url_'.COOKIEHASH] = $comment_author_url;
 389	}
 390}
 391
 392/**
 393 * Validates whether this comment is allowed to be made or not.
 394 *
 395 * @since 2.0.0
 396 * @uses $wpdb
 397 * @uses apply_filters() Calls 'pre_comment_approved' hook on the type of comment
 398 * @uses do_action() Calls 'check_comment_flood' hook on $comment_author_IP, $comment_author_email, and $comment_date_gmt
 399 *
 400 * @param array $commentdata Contains information on the comment
 401 * @return mixed Signifies the approval status (0|1|'spam')
 402 */
 403function wp_allow_comment($commentdata) {
 404	global $wpdb;
 405	extract($commentdata, EXTR_SKIP);
 406
 407	// Simple duplicate check
 408	// expected_slashed ($comment_post_ID, $comment_author, $comment_author_email, $comment_content)
 409	$dupe = "SELECT comment_ID FROM $wpdb->comments WHERE comment_post_ID = '$comment_post_ID' AND ( comment_author = '$comment_author' ";
 410	if ( $comment_author_email )
 411		$dupe .= "OR comment_author_email = '$comment_author_email' ";
 412	$dupe .= ") AND comment_content = '$comment_content' LIMIT 1";
 413	if ( $wpdb->get_var($dupe) ) {
 414		if ( defined('DOING_AJAX') )
 415			die( __('Duplicate comment detected; it looks as though you&#8217;ve already said that!') );
 416
 417		wp_die( __('Duplicate comment detected; it looks as though you&#8217;ve already said that!') );
 418	}
 419
 420	do_action( 'check_comment_flood', $comment_author_IP, $comment_author_email, $comment_date_gmt );
 421
 422	if ( $user_id ) {
 423		$userdata = get_userdata($user_id);
 424		$user = new WP_User($user_id);
 425		$post_author = $wpdb->get_var($wpdb->prepare("SELECT post_author FROM $wpdb->posts WHERE ID = %d LIMIT 1", $comment_post_ID));
 426	}
 427
 428	if ( isset($userdata) && ( $user_id == $post_author || $user->has_cap('moderate_comments') ) ) {
 429		// The author and the admins get respect.
 430		$approved = 1;
 431	 } else {
 432		// Everyone else's comments will be checked.
 433		if ( check_comment($comment_author, $comment_author_email, $comment_author_url, $comment_content, $comment_author_IP, $comment_agent, $comment_type) )
 434			$approved = 1;
 435		else
 436			$approved = 0;
 437		if ( wp_blacklist_check($comment_author, $comment_author_email, $comment_author_url, $comment_content, $comment_author_IP, $comment_agent) )
 438			$approved = 'spam';
 439	}
 440
 441	$approved = apply_filters('pre_comment_approved', $approved);
 442	return $approved;
 443}
 444
 445/**
 446 * Check whether comment flooding is occurring.
 447 *
 448 * Won't run, if current user can manage options, so to not block
 449 * administrators.
 450 *
 451 * @since 2.3.0
 452 * @uses $wpdb
 453 * @uses apply_filters() Calls 'comment_flood_filter' filter with first
 454 *		parameter false, last comment timestamp, new comment timestamp.
 455 * @uses do_action() Calls 'comment_flood_trigger' action with parameters with
 456 *		last comment timestamp and new comment timestamp.
 457 *
 458 * @param string $ip Comment IP.
 459 * @param string $email Comment author email address.
 460 * @param string $date MySQL time string.
 461 */
 462function check_comment_flood_db( $ip, $email, $date ) {
 463	global $wpdb;
 464	if ( current_user_can( 'manage_options' ) )
 465		return; // don't throttle admins
 466	if ( $lasttime = $wpdb->get_var( $wpdb->prepare("SELECT comment_date_gmt FROM $wpdb->comments WHERE comment_author_IP = %s OR comment_author_email = %s ORDER BY comment_date DESC LIMIT 1", $ip, $email) ) ) {
 467		$time_lastcomment = mysql2date('U', $lasttime, false);
 468		$time_newcomment  = mysql2date('U', $date, false);
 469		$flood_die = apply_filters('comment_flood_filter', false, $time_lastcomment, $time_newcomment);
 470		if ( $flood_die ) {
 471			do_action('comment_flood_trigger', $time_lastcomment, $time_newcomment);
 472
 473			if ( defined('DOING_AJAX') )
 474				die( __('You are posting comments too quickly.  Slow down.') );
 475
 476			wp_die( __('You are posting comments too quickly.  Slow down.'), '', array('response' => 403) );
 477		}
 478	}
 479}
 480
 481/**
 482 * Separates an array of comments into an array keyed by comment_type.
 483 *
 484 * @since 2.7.0
 485 *
 486 * @param array $comments Array of comments
 487 * @return array Array of comments keyed by comment_type.
 488 */
 489function &separate_comments(&$comments) {
 490	$comments_by_type = array('comment' => array(), 'trackback' => array(), 'pingback' => array(), 'pings' => array());
 491	$count = count($comments);
 492	for ( $i = 0; $i < $count; $i++ ) {
 493		$type = $comments[$i]->comment_type;
 494		if ( empty($type) )
 495			$type = 'comment';
 496		$comments_by_type[$type][] = &$comments[$i];
 497		if ( 'trackback' == $type || 'pingback' == $type )
 498			$comments_by_type['pings'][] = &$comments[$i];
 499	}
 500
 501	return $comments_by_type;
 502}
 503
 504/**
 505 * Calculate the total number of comment pages.
 506 *
 507 * @since 2.7.0
 508 * @uses get_query_var() Used to fill in the default for $per_page parameter.
 509 * @uses get_option() Used to fill in defaults for parameters.
 510 * @uses Walker_Comment
 511 *
 512 * @param array $comments Optional array of comment objects.  Defaults to $wp_query->comments
 513 * @param int $per_page Optional comments per page.
 514 * @param boolean $threaded Optional control over flat or threaded comments.
 515 * @return int Number of comment pages.
 516 */
 517function get_comment_pages_count( $comments = null, $per_page = null, $threaded = null ) {
 518	global $wp_query;
 519
 520	if ( null === $comments && null === $per_page && null === $threaded && !empty($wp_query->max_num_comment_pages) )
 521		return $wp_query->max_num_comment_pages;
 522
 523	if ( !$comments || !is_array($comments) )
 524		$comments = $wp_query->comments;
 525
 526	if ( empty($comments) )
 527		return 0;
 528
 529	if ( !isset($per_page) )
 530		$per_page = (int) get_query_var('comments_per_page');
 531	if ( 0 === $per_page )
 532		$per_page = (int) get_option('comments_per_page');
 533	if ( 0 === $per_page )
 534		return 1;
 535
 536	if ( !isset($threaded) )
 537		$threaded = get_option('thread_comments');
 538
 539	if ( $threaded ) {
 540		$walker = new Walker_Comment;
 541		$count = ceil( $walker->get_number_of_root_elements( $comments ) / $per_page );
 542	} else {
 543		$count = ceil( count( $comments ) / $per_page );
 544	}
 545
 546	return $count;
 547}
 548
 549/**
 550 * Calculate what page number a comment will appear on for comment paging.
 551 *
 552 * @since 2.7.0
 553 * @uses get_comment() Gets the full comment of the $comment_ID parameter.
 554 * @uses get_option() Get various settings to control function and defaults.
 555 * @uses get_page_of_comment() Used to loop up to top level comment.
 556 *
 557 * @param int $comment_ID Comment ID.
 558 * @param array $args Optional args.
 559 * @return int|null Comment page number or null on error.
 560 */
 561function get_page_of_comment( $comment_ID, $args = array() ) {
 562	global $wpdb;
 563
 564	if ( !$comment = get_comment( $comment_ID ) )
 565		return;
 566
 567	$defaults = array( 'type' => 'all', 'page' => '', 'per_page' => '', 'max_depth' => '' );
 568	$args = wp_parse_args( $args, $defaults );
 569
 570	if ( '' === $args['per_page'] && get_option('page_comments') )
 571		$args['per_page'] = get_query_var('comments_per_page');
 572	if ( empty($args['per_page']) ) {
 573		$args['per_page'] = 0;
 574		$args['page'] = 0;
 575	}
 576	if ( $args['per_page'] < 1 )
 577		return 1;
 578
 579	if ( '' === $args['max_depth'] ) {
 580		if ( get_option('thread_comments') )
 581			$args['max_depth'] = get_option('thread_comments_depth');
 582		else
 583			$args['max_depth'] = -1;
 584	}
 585
 586	// Find this comment's top level parent if threading is enabled
 587	if ( $args['max_depth'] > 1 && 0 != $comment->comment_parent )
 588		return get_page_of_comment( $comment->comment_parent, $args );
 589
 590	$allowedtypes = array(
 591		'comment' => '',
 592		'pingback' => 'pingback',
 593		'trackback' => 'trackback',
 594	);
 595
 596	$comtypewhere = ( 'all' != $args['type'] && isset($allowedtypes[$args['type']]) ) ? " AND comment_type = '" . $allowedtypes[$args['type']] . "'" : '';
 597
 598	// Count comments older than this one
 599	$oldercoms = $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(comment_ID) FROM $wpdb->comments WHERE comment_post_ID = %d AND comment_parent = 0 AND comment_approved = '1' AND comment_date_gmt < '%s'" . $comtypewhere, $comment->comment_post_ID, $comment->comment_date_gmt ) );
 600
 601	// No older comments? Then it's page #1.
 602	if ( 0 == $oldercoms )
 603		return 1;
 604
 605	// Divide comments older than this one by comments per page to get this comment's page number
 606	return ceil( ( $oldercoms + 1 ) / $args['per_page'] );
 607}
 608
 609/**
 610 * Does comment contain blacklisted characters or words.
 611 *
 612 * @since 1.5.0
 613 * @uses do_action() Calls 'wp_blacklist_check' hook for all parameters.
 614 *
 615 * @param string $author The author of the comment
 616 * @param string $email The email of the comment
 617 * @param string $url The url used in the comment
 618 * @param string $comment The comment content
 619 * @param string $user_ip The comment author IP address
 620 * @param string $user_agent The author's browser user agent
 621 * @return bool True if comment contains blacklisted content, false if comment does not
 622 */
 623function wp_blacklist_check($author, $email, $url, $comment, $user_ip, $user_agent) {
 624	do_action('wp_blacklist_check', $author, $email, $url, $comment, $user_ip, $user_agent);
 625
 626	if ( preg_match_all('/&#(\d+);/', $comment . $author . $url, $chars) ) {
 627		foreach ( (array) $chars[1] as $char ) {
 628			// If it's an encoded char in the normal ASCII set, reject
 629			if ( 38 == $char )
 630				continue; // Unless it's &
 631			if ( $char < 128 )
 632				return true;
 633		}
 634	}
 635
 636	$mod_keys = trim( get_option('blacklist_keys') );
 637	if ( '' == $mod_keys )
 638		return false; // If moderation keys are empty
 639	$words = explode("\n", $mod_keys );
 640
 641	foreach ( (array) $words as $word ) {
 642		$word = trim($word);
 643
 644		// Skip empty lines
 645		if ( empty($word) ) { continue; }
 646
 647		// Do some escaping magic so that '#' chars in the
 648		// spam words don't break things:
 649		$word = preg_quote($word, '#');
 650
 651		$pattern = "#$word#i";
 652		if (
 653			   preg_match($pattern, $author)
 654			|| preg_match($pattern, $email)
 655			|| preg_match($pattern, $url)
 656			|| preg_match($pattern, $comment)
 657			|| preg_match($pattern, $user_ip)
 658			|| preg_match($pattern, $user_agent)
 659		 )
 660			return true;
 661	}
 662	return false;
 663}
 664
 665/**
 666 * Retrieve total comments for blog or single post.
 667 *
 668 * The properties of the returned object contain the 'moderated', 'approved',
 669 * and spam comments for either the entire blog or single post. Those properties
 670 * contain the amount of comments that match the status. The 'total_comments'
 671 * property contains the integer of total comments.
 672 *
 673 * The comment stats are cached and then retrieved, if they already exist in the
 674 * cache.
 675 *
 676 * @since 2.5.0
 677 *
 678 * @param int $post_id Optional. Post ID.
 679 * @return object Comment stats.
 680 */
 681function wp_count_comments( $post_id = 0 ) {
 682	global $wpdb;
 683
 684	$post_id = (int) $post_id;
 685
 686	$stats = apply_filters('wp_count_comments', array(), $post_id);
 687	if ( !empty($stats) )
 688		return $stats;
 689
 690	$count = wp_cache_get("comments-{$post_id}", 'counts');
 691
 692	if ( false !== $count )
 693		return $count;
 694
 695	$where = '';
 696	if( $post_id > 0 )
 697		$where = $wpdb->prepare( "WHERE comment_post_ID = %d", $post_id );
 698
 699	$count = $wpdb->get_results( "SELECT comment_approved, COUNT( * ) AS num_comments FROM {$wpdb->comments} {$where} GROUP BY comment_approved", ARRAY_A );
 700
 701	$total = 0;
 702	$approved = array('0' => 'moderated', '1' => 'approved', 'spam' => 'spam');
 703	$known_types = array_keys( $approved );
 704	foreach( (array) $count as $row_num => $row ) {
 705		$total += $row['num_comments'];
 706		if ( in_array( $row['comment_approved'], $known_types ) )
 707			$stats[$approved[$row['comment_approved']]] = $row['num_comments'];
 708	}
 709
 710	$stats['total_comments'] = $total;
 711	foreach ( $approved as $key ) {
 712		if ( empty($stats[$key]) )
 713			$stats[$key] = 0;
 714	}
 715
 716	$stats = (object) $stats;
 717	wp_cache_set("comments-{$post_id}", $stats, 'counts');
 718
 719	return $stats;
 720}
 721
 722/**
 723 * Removes comment ID and maybe updates post comment count.
 724 *
 725 * The post comment count will be updated if the comment was approved and has a
 726 * post ID available.
 727 *
 728 * @since 2.0.0
 729 * @uses $wpdb
 730 * @uses do_action() Calls 'delete_comment' hook on comment ID
 731 * @uses do_action() Calls 'wp_set_comment_status' hook on comment ID with 'delete' set for the second parameter
 732 * @uses wp_transition_comment_status() Passes new and old comment status along with $comment object
 733 *
 734 * @param int $comment_id Comment ID
 735 * @return bool False if delete comment query failure, true on success.
 736 */
 737function wp_delete_comment($comment_id) {
 738	global $wpdb;
 739	do_action('delete_comment', $comment_id);
 740
 741	$comment = get_comment($comment_id);
 742
 743	if ( ! $wpdb->query( $wpdb->prepare("DELETE FROM $wpdb->comments WHERE comment_ID = %d LIMIT 1", $comment_id) ) )
 744		return false;
 745
 746	// Move children up a level.
 747	$children = $wpdb->get_col( $wpdb->prepare("SELECT comment_ID FROM $wpdb->comments WHERE comment_parent = %d", $comment_id) );
 748	if ( !empty($children) ) {
 749		$wpdb->update($wpdb->comments, array('comment_parent' => $comment->comment_parent), array('comment_parent' => $comment_id));
 750		clean_comment_cache($children);
 751	}
 752
 753	$post_id = $comment->comment_post_ID;
 754	if ( $post_id && $comment->comment_approved == 1 )
 755		wp_update_comment_count($post_id);
 756
 757	clean_comment_cache($comment_id);
 758
 759	do_action('wp_set_comment_status', $comment_id, 'delete');
 760	wp_transition_comment_status('delete', $comment->comment_approved, $comment);
 761	return true;
 762}
 763
 764/**
 765 * The status of a comment by ID.
 766 *
 767 * @since 1.0.0
 768 *
 769 * @param int $comment_id Comment ID
 770 * @return string|bool Status might be 'deleted', 'approved', 'unapproved', 'spam'. False on failure.
 771 */
 772function wp_get_comment_status($comment_id) {
 773	$comment = get_comment($comment_id);
 774	if ( !$comment )
 775		return false;
 776
 777	$approved = $comment->comment_approved;
 778
 779	if ( $approved == NULL )
 780		return 'deleted';
 781	elseif ( $approved == '1' )
 782		return 'approved';
 783	elseif ( $approved == '0' )
 784		return 'unapproved';
 785	elseif ( $approved == 'spam' )
 786		return 'spam';
 787	else
 788		return false;
 789}
 790
 791/**
 792 * Call hooks for when a comment status transition occurs.
 793 *
 794 * Calls hooks for comment status transitions. If the new comment status is not the same
 795 * as the previous comment status, then two hooks will be ran, the first is
 796 * 'transition_comment_status' with new status, old status, and comment data. The
 797 * next action called is 'comment_OLDSTATUS_to_NEWSTATUS' the NEWSTATUS is the
 798 * $new_status parameter and the OLDSTATUS is $old_status parameter; it has the
 799 * comment data.
 800 *
 801 * The final action will run whether or not the comment statuses are the same. The
 802 * action is named 'comment_NEWSTATUS_COMMENTTYPE', NEWSTATUS is from the $new_status
 803 * parameter and COMMENTTYPE is comment_type comment data.
 804 *
 805 * @since 2.7.0
 806 *
 807 * @param string $new_status New comment status.
 808 * @param string $old_status Previous comment status.
 809 * @param object $comment Comment data.
 810 */
 811function wp_transition_comment_status($new_status, $old_status, $comment) {
 812	// Translate raw statuses to human readable formats for the hooks
 813	// This is not a complete list of comment status, it's only the ones that need to be renamed
 814	$comment_statuses = array(
 815		0         => 'unapproved',
 816		'hold'    => 'unapproved', // wp_set_comment_status() uses "hold"
 817		1         => 'approved',
 818		'approve' => 'approved', // wp_set_comment_status() uses "approve"
 819	);
 820	if ( isset($comment_statuses[$new_status]) ) $new_status = $comment_statuses[$new_status];
 821	if ( isset($comment_statuses[$old_status]) ) $old_status = $comment_statuses[$old_status];
 822
 823	// Call the hooks
 824	if ( $new_status != $old_status ) {
 825		do_action('transition_comment_status', $new_status, $old_status, $comment);
 826		do_action("comment_${old_status}_to_$new_status", $comment);
 827	}
 828	do_action("comment_${new_status}_$comment->comment_type", $comment->comment_ID, $comment);
 829}
 830
 831/**
 832 * Get current commenter's name, email, and URL.
 833 *
 834 * Expects cookies content to already be sanitized. User of this function might
 835 * wish to recheck the returned array for validity.
 836 *
 837 * @see sanitize_comment_cookies() Use to sanitize cookies
 838 *
 839 * @since 2.0.4
 840 *
 841 * @return array Comment author, email, url respectively.
 842 */
 843function wp_get_current_commenter() {
 844	// Cookies should already be sanitized.
 845
 846	$comment_author = '';
 847	if ( isset($_COOKIE['comment_author_'.COOKIEHASH]) )
 848		$comment_author = $_COOKIE['comment_author_'.COOKIEHASH];
 849
 850	$comment_author_email = '';
 851	if ( isset($_COOKIE['comment_author_email_'.COOKIEHASH]) )
 852		$comment_author_email = $_COOKIE['comment_author_email_'.COOKIEHASH];
 853
 854	$comment_author_url = '';
 855	if ( isset($_COOKIE['comment_author_url_'.COOKIEHASH]) )
 856		$comment_author_url = $_COOKIE['comment_author_url_'.COOKIEHASH];
 857
 858	return compact('comment_author', 'comment_author_email', 'comment_author_url');
 859}
 860
 861/**
 862 * Inserts a comment to the database.
 863 *
 864 * The available comment data key names are 'comment_author_IP', 'comment_date',
 865 * 'comment_date_gmt', 'comment_parent', 'comment_approved', and 'user_id'.
 866 *
 867 * @since 2.0.0
 868 * @uses $wpdb
 869 *
 870 * @param array $commentdata Contains information on the comment.
 871 * @return int The new comment's ID.
 872 */
 873function wp_insert_comment($commentdata) {
 874	global $wpdb;
 875	extract(stripslashes_deep($commentdata), EXTR_SKIP);
 876
 877	if ( ! isset($comment_author_IP) )
 878		$comment_author_IP = '';
 879	if ( ! isset($comment_date) )
 880		$comment_date = current_time('mysql');
 881	if ( ! isset($comment_date_gmt) )
 882		$comment_date_gmt = get_gmt_from_date($comment_date);
 883	if ( ! isset($comment_parent) )
 884		$comment_parent = 0;
 885	if ( ! isset($comment_approved) )
 886		$comment_approved = 1;
 887	if ( ! isset($comment_karma) )
 888		$comment_karma = 0;
 889	if ( ! isset($user_id) )
 890		$user_id = 0;
 891	if ( ! isset($comment_type) )
 892		$comment_type = '';
 893
 894	$data = compact('comment_post_ID', 'comment_author', 'comment_author_email', 'comment_author_url', 'comment_author_IP', 'comment_date', 'comment_date_gmt', 'comment_content', 'comment_karma', 'comment_approved', 'comment_agent', 'comment_type', 'comment_parent', 'user_id');
 895	$wpdb->insert($wpdb->comments, $data);
 896
 897	$id = (int) $wpdb->insert_id;
 898
 899	if ( $comment_approved == 1 )
 900		wp_update_comment_count($comment_post_ID);
 901
 902	$comment = get_comment($id);
 903	do_action('wp_insert_comment', $id, $comment);
 904
 905	return $id;
 906}
 907
 908/**
 909 * Filters and sanitizes comment data.
 910 *
 911 * Sets the comment data 'filtered' field to true when finished. This can be
 912 * checked as to whether the comment should be filtered and to keep from
 913 * filtering the same comment more than once.
 914 *
 915 * @since 2.0.0
 916 * @uses apply_filters() Calls 'pre_user_id' hook on comment author's user ID
 917 * @uses apply_filters() Calls 'pre_comment_user_agent' hook on comment author's user agent
 918 * @uses apply_filters() Calls 'pre_comment_author_name' hook on comment author's name
 919 * @uses apply_filters() Calls 'pre_comment_content' hook on the comment's content
 920 * @uses apply_filters() Calls 'pre_comment_user_ip' hook on comment author's IP
 921 * @uses apply_filters() Calls 'pre_comment_author_url' hook on comment author's URL
 922 * @uses apply_filters() Calls 'pre_comment_author_email' hook on comment author's email address
 923 *
 924 * @param array $commentdata Contains information on the comment.
 925 * @return array Parsed comment information.
 926 */
 927function wp_filter_comment($commentdata) {
 928	$commentdata['user_id']              = apply_filters('pre_user_id', $commentdata['user_ID']);
 929	$commentdata['comment_agent']        = apply_filters('pre_comment_user_agent', $commentdata['comment_agent']);
 930	$commentdata['comment_author']       = apply_filters('pre_comment_author_name', $commentdata['comment_author']);
 931	$commentdata['comment_content']      = apply_filters('pre_comment_content', $commentdata['comment_content']);
 932	$commentdata['comment_author_IP']    = apply_filters('pre_comment_user_ip', $commentdata['comment_author_IP']);
 933	$commentdata['comment_author_url']   = apply_filters('pre_comment_author_url', $commentdata['comment_author_url']);
 934	$commentdata['comment_author_email'] = apply_filters('pre_comment_author_email', $commentdata['comment_author_email']);
 935	$commentdata['filtered'] = true;
 936	return $commentdata;
 937}
 938
 939/**
 940 * Whether comment should be blocked because of comment flood.
 941 *
 942 * @since 2.1.0
 943 *
 944 * @param bool $block Whether plugin has already blocked comment.
 945 * @param int $time_lastcomment Timestamp for last comment.
 946 * @param int $time_newcomment Timestamp for new comment.
 947 * @return bool Whether comment should be blocked.
 948 */
 949function wp_throttle_comment_flood($block, $time_lastcomment, $time_newcomment) {
 950	if ( $block ) // a plugin has already blocked... we'll let that decision stand
 951		return $block;
 952	if ( ($time_newcomment - $time_lastcomment) < 15 )
 953		return true;
 954	return false;
 955}
 956
 957/**
 958 * Adds a new comment to the database.
 959 *
 960 * Filters new comment to ensure that the fields are sanitized and valid before
 961 * inserting comment into database. Calls 'comment_post' action with comment ID
 962 * and whether comment is approved by WordPress. Also has 'preprocess_comment'
 963 * filter for processing the comment data before the function handles it.
 964 *
 965 * @since 1.5.0
 966 * @uses apply_filters() Calls 'preprocess_comment' hook on $commentdata parameter array before processing
 967 * @uses do_action() Calls 'comment_post' hook on $comment_ID returned from adding the comment and if the comment was approved.
 968 * @uses wp_filter_comment() Used to filter comment before adding comment.
 969 * @uses wp_allow_comment() checks to see if comment is approved.
 970 * @uses wp_insert_comment() Does the actual comment insertion to the database.
 971 *
 972 * @param array $commentdata Contains information on the comment.
 973 * @return int The ID of the comment after adding.
 974 */
 975function wp_new_comment( $commentdata ) {
 976	$commentdata = apply_filters('preprocess_comment', $commentdata);
 977
 978	$commentdata['comment_post_ID'] = (int) $commentdata['comment_post_ID'];
 979	$commentdata['user_ID']         = (int) $commentdata['user_ID'];
 980
 981	$commentdata['comment_parent'] = absint($commentdata['comment_parent']);
 982	$parent_status = ( 0 < $commentdata['comment_parent'] ) ? wp_get_comment_status($commentdata['comment_parent']) : '';
 983	$commentdata['comment_parent'] = ( 'approved' == $parent_status || 'unapproved' == $parent_status ) ? $commentdata['comment_parent'] : 0;
 984
 985	$commentdata['comment_author_IP'] = preg_replace( '/[^0-9a-fA-F:., ]/', '',$_SERVER['REMOTE_ADDR'] );
 986	$commentdata['comment_agent']     = $_SERVER['HTTP_USER_AGENT'];
 987
 988	$commentdata['comment_date']     = current_time('mysql');
 989	$commentdata['comment_date_gmt'] = current_time('mysql', 1);
 990
 991	$commentdata = wp_filter_comment($commentdata);
 992
 993	$commentdata['comment_approved'] = wp_allow_comment($commentdata);
 994
 995	$comment_ID = wp_insert_comment($commentdata);
 996
 997	do_action('comment_post', $comment_ID, $commentdata['comment_approved']);
 998
 999	if ( 'spam' !== $commentdata['comment_approved'] ) { // If it's spam save it silently for later crunching
1000		if ( '0' == $commentdata['comment_approved'] )
1001			wp_notify_moderator($comment_ID);
1002
1003		$post = &get_post($commentdata['comment_post_ID']); // Don't notify if it's your own comment
1004
1005		if ( get_option('comments_notify') && $commentdata['comment_approved'] && $post->post_author != $commentdata['user_ID'] )
1006			wp_notify_postauthor($comment_ID, $commentdata['comment_type']);
1007	}
1008
1009	return $comment_ID;
1010}
1011
1012/**
1013 * Sets the status of a comment.
1014 *
1015 * The 'wp_set_comment_status' action is called after the comment is handled and
1016 * will only be called, if the comment status is either 'hold', 'approve', or
1017 * 'spam'. If the comment status is not in the list, then false is returned and
1018 * if the status is 'delete', then the comment is deleted without calling the
1019 * action.
1020 *
1021 * @since 1.0.0
1022 * @uses wp_transition_comment_status() Passes new and old comment status along with $comment object
1023 *
1024 * @param int $comment_id Comment ID.
1025 * @param string $comment_status New comment status, either 'hold', 'approve', 'spam', or 'delete'.
1026 * @param bool $wp_error Whether to return a WP_Error object if there is a failure. Default is false.
1027 * @return bool False on failure or deletion and true on success.
1028 */
1029function wp_set_comment_status($comment_id, $comment_status, $wp_error = false) {
1030	global $wpdb;
1031
1032	$status = '0';
1033	switch ( $comment_status ) {
1034		case 'hold':
1035			$status = '0';
1036			break;
1037		case 'approve':
1038			$status = '1';
1039			if ( get_option('comments_notify') ) {
1040				$comment = get_comment($comment_id);
1041				wp_notify_postauthor($comment_id, $comment->comment_type);
1042			}
1043			break;
1044		case 'spam':
1045			$status = 'spam';
1046			break;
1047		case 'delete':
1048			return wp_delete_comment($comment_id);
1049			break;
1050		default:
1051			return false;
1052	}
1053
1054	if ( !$wpdb->update( $wpdb->comments, array('comment_approved' => $status), array('comment_ID' => $comment_id) ) ) {
1055		if ( $wp_error )
1056			return new WP_Error('db_update_error', __('Could not update comment status'), $wpdb->last_error);
1057		else
1058			return false;
1059	}
1060
1061	clean_comment_cache($comment_id);
1062
1063	$comment = get_comment($comment_id);
1064
1065	do_action('wp_set_comment_status', $comment_id, $comment_status);
1066	wp_transition_comment_status($comment_status, $comment->comment_approved, $comment);
1067
1068	wp_update_comment_count($comment->comment_post_ID);
1069
1070	return true;
1071}
1072
1073/**
1074 * Updates an existing comment in the database.
1075 *
1076 * Filters the comment and makes sure certain fields are valid before updating.
1077 *
1078 * @since 2.0.0
1079 * @uses $wpdb
1080 * @uses wp_transition_comment_status() Passes new and old comment status along with $comment object
1081 *
1082 * @param array $commentarr Contains information on the comment.
1083 * @return int Comment was updated if value is 1, or was not updated if value is 0.
1084 */
1085function wp_update_comment($commentarr) {
1086	global $wpdb;
1087
1088	// First, get all of the original fields
1089	$comment = get_comment($commentarr['comment_ID'], ARRAY_A);
1090
1091	// Escape data pulled from DB.
1092	$comment = $wpdb->escape($comment);
1093
1094	$old_status = $comment['comment_approved'];
1095
1096	// Merge old and new fields with new fields overwriting old ones.
1097	$commentarr = array_merge($comment, $commentarr);
1098
1099	$commentarr = wp_filter_comment( $commentarr );
1100
1101	// Now extract the merged array.
1102	extract(stripslashes_deep($commentarr), EXTR_SKIP);
1103
1104	$comment_content = apply_filters('comment_save_pre', $comment_content);
1105
1106	$comment_date_gmt = get_gmt_from_date($comment_date);
1107
1108	if ( !isset($comment_approved) )
1109		$comment_approved = 1;
1110	else if ( 'hold' == $comment_approved )
1111		$comment_approved = 0;
1112	else if ( 'approve' == $comment_approved )
1113		$comment_approved = 1;
1114
1115	$data = compact('comment_content', 'comment_author', 'comment_author_email', 'comment_approved', 'comment_karma', 'comment_author_url', 'comment_date', 'comment_date_gmt');
1116	$wpdb->update($wpdb->comments, $data, compact('comment_ID'));
1117
1118	$rval = $wpdb->rows_affected;
1119
1120	clean_comment_cache($comment_ID);
1121	wp_update_comment_count($comment_post_ID);
1122	do_action('edit_comment', $comment_ID);
1123	$comment = get_comment($comment_ID);
1124	wp_transition_comment_status($comment->comment_approved, $old_status, $comment);
1125	return $rval;
1126}
1127
1128/**
1129 * Whether to defer comment counting.
1130 *
1131 * When setting $defer to true, all post comment counts will not be updated
1132 * until $defer is set to false. When $defer is set to false, then all
1133 * previously deferred updated post comment counts will then be automatically
1134 * updated without having to call wp_update_comment_count() after.
1135 *
1136 * @since 2.5.0
1137 * @staticvar bool $_defer
1138 *
1139 * @param bool $defer
1140 * @return unknown
1141 */
1142function wp_defer_comment_counting($defer=null) {
1143	static $_defer = false;
1144
1145	if ( is_bool($defer) ) {
1146		$_defer = $defer;
1147		// flush any deferred counts
1148		if ( !$defer )
1149			wp_update_comment_count( null, true );
1150	}
1151
1152	return $_defer;
1153}
1154
1155/**
1156 * Updates the comment count for post(s).
1157 *
1158 * When $do_deferred is false (is by default) and the comments have been set to
1159 * be deferred, the post_id will be added to a queue, which will be updated at a
1160 * later date and only updated once per post ID.
1161 *
1162 * If the comments have not be set up to be deferred, then the post will be
1163 * updated. When $do_deferred is set to true, then all previous deferred post
1164 * IDs will be updated along with the current $post_id.
1165 *
1166 * @since 2.1.0
1167 * @see wp_update_comment_count_now() For what could cause a false return value
1168 *
1169 * @param int $post_id Post ID
1170 * @param bool $do_deferred Whether to process previously deferred post comment counts
1171 * @return bool True on success, false on failure
1172 */
1173function wp_update_comment_count($post_id, $do_deferred=false) {
1174	static $_deferred = array();
1175
1176	if ( $do_deferred ) {
1177		$_deferred = array_unique($_deferred);
1178		foreach ( $_deferred as $i => $_post_id ) {
1179			wp_update_comment_count_now($_post_id);
1180			unset( $_deferred[$i] ); /** @todo Move this outside of the foreach and reset $_deferred to an array instead */
1181		}
1182	}
1183
1184	if ( wp_defer_comment_counting() ) {
1185		$_deferred[] = $post_id;
1186		return true;
1187	}
1188	elseif ( $post_id ) {
1189		return wp_update_comment_count_now($post_id);
1190	}
1191
1192}
1193
1194/**
1195 * Updates the comment count for the post.
1196 *
1197 * @since 2.5.0
1198 * @uses $wpdb
1199 * @uses do_action() Calls 'wp_update_comment_count' hook on $post_id, $new, and $old
1200 * @uses do_action() Calls 'edit_posts' hook on $post_id and $post
1201 *
1202 * @param int $post_id Post ID
1203 * @return bool False on '0' $post_id or if post with ID does not exist. True on success.
1204 */
1205function wp_update_comment_count_now($post_id) {
1206	global $wpdb;
1207	$post_id = (int) $post_id;
1208	if ( !$post_id )
1209		return false;
1210	if ( !$post = get_post($post_id) )
1211		return false;
1212
1213	$old = (int) $post->comment_count;
1214	$new = (int) $wpdb->get_var( $wpdb->prepare("SELECT COUNT(*) FROM $wpdb->comments WHERE comment_post_ID = %d AND comment_approved = '1'", $post_id) );
1215	$wpdb->update( $wpdb->posts, array('comment_count' => $new), array('ID' => $post_id) );
1216
1217	if ( 'page' == $post->post_type )
1218		clean_page_cache( $post_id );
1219	else
1220		clean_post_cache( $post_id );
1221
1222	do_action('wp_update_comment_count', $post_id, $new, $old);
1223	do_action('edit_post', $post_id, $post);
1224
1225	return true;
1226}
1227
1228//
1229// Ping and trackback functions.
1230//
1231
1232/**
1233 * Finds a pingback server URI based on the given URL.
1234 *
1235 * Checks the HTML for the rel="pingback" link and x-pingback headers. It does
1236 * a check for the x-pingback headers first and returns that, if available. The
1237 * check for the rel="pingback" has more overhead than just the header.
1238 *
1239 * @since 1.5.0
1240 *
1241 * @param string $url URL to ping.
1242 * @param int $deprecated Not Used.
1243 * @return bool|string False on failure, string containing URI on success.
1244 */
1245function discover_pingback_server_uri($url, $deprecated = 2048) {
1246
1247	$pingback_str_dquote = 'rel="pingback"';
1248	$pingback_str_squote = 'rel=\'pingback\'';
1249
1250	/** @todo Should use Filter Extension or custom preg_match instead. */
1251	$parsed_url = parse_url($url);
1252
1253	if ( ! isset( $parsed_url['host'] ) ) // Not an URL. This should never happen.
1254		return false;
1255
1256	//Do not search for a pingback server on our own uploads
1257	$uploads_dir = wp_upload_dir();
1258	if ( 0 === strpos($url, $uploads_dir['baseurl']) )
1259		return false;
1260
1261	$response = wp_remote_head( $url, array( 'timeout' => 2, 'httpversion' => '1.0' ) );
1262
1263	if ( is_wp_error( $response ) )
1264		return false;
1265
1266	if ( isset( $response['headers']['x-pingback'] ) )
1267		return $response['headers']['x-pingback'];
1268
1269	// Not an (x)html, sgml, or xml page, no use going further.
1270	if ( isset( $response['headers']['content-type'] ) && preg_match('#(image|audio|video|model)/#is', $response['headers']['content-type']) )
1271		return false;
1272
1273	// Now do a GET since we're going to look in the html headers (and we're sure its not a binary file)
1274	$response = wp_remote_get( $url, array( 'timeout' => 2, 'httpversion' => '1.0' ) );
1275
1276	if ( is_wp_error( $response ) )
1277		return false;
1278
1279	$contents = $response['body'];
1280
1281	$pingback_link_offset_dquote = strpos($contents, $pingback_str_dquote);
1282	$pingback_link_offset_squote = strpos($contents, $pingback_str_squote);
1283	if ( $pingback_link_offset_dquote || $pingback_link_offset_squote ) {
1284		$quote = ($pingback_link_offset_dquote) ? '"' : '\'';
1285		$pingback_link_offset = ($quote=='"') ? $pingback_link_offset_dquote : $pingback_link_offset_squote;
1286		$pingback_href_pos = @strpos($contents, 'href=', $pingback_link_offset);
1287		$pingback_href_start = $pingback_href_pos+6;
1288		$pingback_href_end = @strpos($contents, $quote, $pingback_href_start);
1289		$pingback_server_url_len = $pingback_href_end - $pingback_href_start;
1290		$pingback_server_url = substr($contents, $pingback_href_start, $pingback_server_url_len);
1291
1292		// We may find rel="pingback" but an incomplete pingback URL
1293		if ( $pingback_server_url_len > 0 ) { // We got it!
1294			return $pingback_server_url;
1295		}
1296	}
1297
1298	return false;
1299}
1300
1301/**
1302 * Perform all pingbacks, enclosures, trackbacks, and send to pingback services.
1303 *
1304 * @since 2.1.0
1305 * @uses $wpdb
1306 */
1307function do_all_pings() {
1308	global $wpdb;
1309
1310	// Do pingbacks
1311	while ($ping = $wpdb->get_row("SELECT * FROM {$wpdb->posts}, {$wpdb->postmeta} WHERE {$wpdb->posts}.ID = {$wpdb->postmeta}.post_id AND {$wpdb->postmeta}.meta_key = '_pingme' LIMIT 1")) {
1312		$wpdb->query("DELETE FROM {$wpdb->postmeta} WHERE post_id = {$ping->ID} AND meta_key = '_pingme';");
1313		pingback($ping->post_content, $ping->ID);
1314	}
1315
1316	// Do Enclosures
1317	while ($enclosure = $wpdb->get_row("SELECT * FROM {$wpdb->posts}, {$wpdb->postmeta} WHERE {$wpdb->posts}.ID = {$wpdb->postmeta}.post_id AND {$wpdb->postmeta}.meta_key = '_encloseme' LIMIT 1")) {
1318		$wpdb->query( $wpdb->prepare("DELETE FROM {$wpdb->postmeta} WHERE post_id = %d AND meta_key = '_encloseme';", $enclosure->ID) );
1319		do_enclose($enclosure->post_content, $enclosure->ID);
1320	}
1321
1322	// Do Trackbacks
1323	$trackbacks = $wpdb->get_col("SELECT ID FROM $wpdb->posts WHERE to_ping <> '' AND post_status = 'publish'");
1324	if ( is_array($trackbacks) )
1325		foreach ( $trackbacks as $trackback )
1326			do_trackbacks($trackback);
1327}
1328
1329/**
1330 * Perform trackbacks.
1331 *
1332 * @since 1.5.0
1333 * @uses $wpdb
1334 *
1335 * @param int $post_id Post ID to do trackbacks on.
1336 */
1337function do_trackbacks($post_id) {
1338	global $wpdb;
1339
1340	$post = $wpdb->get_row( $wpdb->prepare("SELECT * FROM $wpdb->posts WHERE ID = %d", $post_id) );
1341	$to_ping = get_to_ping($post_id);
1342	$pinged  = get_pung($post_id);
1343	if ( empty($to_ping) ) {
1344		$wpdb->update($wpdb->posts, array('to_ping' => ''), array('ID' => $post_id) );
1345		return;
1346	}
1347
1348	if ( empty($post->post_excerpt) )
1349		$excerpt = apply_filters('the_content', $post->post_content);
1350	else
1351		$excerpt = apply_filters('the_excerpt', $post->post_excerpt);
1352	$excerpt = str_replace(']]>', ']]&gt;', $excerpt);
1353	$excerpt = wp_html_excerpt($excerpt, 252) . '...';
1354
1355	$post_title = apply_filters('the_title', $post->post_title);
1356	$post_title = strip_tags($post_title);
1357
1358	if ( $to_ping ) {
1359		foreach ( (array) $to_ping as $tb_ping ) {
1360			$tb_ping = trim($tb_ping);
1361			if ( !in_array($tb_ping, $pinged) ) {
1362				trackback($tb_ping, $post_title, $excerpt, $post_id);
1363				$pinged[] = $tb_ping;
1364			} else {
1365				$wpdb->query( $wpdb->prepare("UPDATE $wpdb->posts SET to_ping = TRIM(REPLACE(to_ping, '$tb_ping', '')) WHERE ID = %d", $post_id) );
1366			}
1367		}
1368	}
1369}
1370
1371/**
1372 * Sends pings to all of the ping site services.
1373 *
1374 * @since 1.2.0
1375 *
1376 * @param int $post_id Post ID. Not actually used.
1377 * @return int Same as Post ID from parameter
1378 */
1379function generic_ping($post_id = 0) {
1380	$services = get_option('ping_sites');
1381
1382	$services = explode("\n", $services);
1383	foreach ( (array) $services as $service ) {
1384		$service = trim($service);
1385		if ( '' != $service )
1386			weblog_ping($service);
1387	}
1388
1389	return $post_id;
1390}
1391
1392/**
1393 * Pings back the links found in a post.
1394 *
1395 * @since 0.71
1396 * @uses $wp_version
1397 * @uses IXR_Client
1398 *
1399 * @param string $content Post content to check for links.
1400 * @param int $post_ID Post ID.
1401 */
1402function pingback($content, $post_ID) {
1403	global $wp_version;
1404	include_once(ABSPATH . WPINC . '/class-IXR.php');
1405
1406	// original code by Mort (http://mort.mine.nu:8080)
1407	$post_links = array();
1408
1409	$pung = get_pung($post_ID);
1410
1411	// Variables
1412	$ltrs = '\w';
1413	$gunk = '/#~:.?+=&%@!\-';
1414	$punc = '.:?\-';
1415	$any = $ltrs . $gunk . $punc;
1416
1417	// Step 1
1418	// Parsing the post, external links (if any) are stored in the $post_links array
1419	// This regexp comes straight from phpfreaks.com
1420	// http://www.phpfreaks.com/quickcode/Extract_All_URLs_on_a_Page/15.php
1421	preg_match_all("{\b http : [$any] +? (?= [$punc] * [^$any] | $)}x", $content, $post_links_temp);
1422
1423	// Step 2.
1424	// Walking thru the links array
1425	// first we get rid of links pointing to sites, not to specific files
1426	// Example:
1427	// http://dummy-weblog.org
1428	// http://dummy-weblog.org/
1429	// http://dummy-weblog.org/post.php
1430	// We don't wanna ping first and second types, even if they have a valid <link/>
1431
1432	foreach ( (array) $post_links_temp[0] as $link_test ) :
1433		if ( !in_array($link_test, $pung) && (url_to_postid($link_test) != $post_ID) // If we haven't pung it already and it isn't a link to itself
1434				&& !is_local_attachment($link_test) ) : // Also, let's never ping local attachments.
1435			if ( $test = @parse_url($link_test) ) {
1436				if ( isset($test['query']) )
1437					$post_links[] = $link_test;
1438				elseif ( ($test['path'] != '/') && ($test['path'] != '') )
1439					$post_links[] = $link_test;
1440			}
1441		endif;
1442	endforeach;
1443
1444	do_action_ref_array('pre_ping', array(&$post_links, &$pung));
1445
1446	foreach ( (array) $post_links as $pagelinkedto ) {
1447		$pingback_server_url = discover_pingback_server_uri($pagelinkedto, 2048);
1448
1449		if ( $pingback_server_url ) {
1450			@ set_time_limit( 60 );
1451			 // Now, the RPC call
1452			$pagelinkedfrom = get_permalink($post_ID);
1453
1454			// using a timeout of 3 seconds should be enough to cover slow servers
1455			$client = new IXR_Client($pingback_server_url);
1456			$client->timeout = 3;
1457			$client->useragent .= ' -- WordPress/' . $wp_version;
1458
1459			// when set to true, this outputs debug messages by itself
1460			$client->debug = false;
1461
1462			if ( $client->query('pingback.ping', $pagelinkedfrom, $pagelinkedto) || ( isset($client->error->code) && 48 == $client->error->code ) ) // Already registered
1463				add_ping( $post_ID, $pagelinkedto );
1464		}
1465	}
1466}
1467
1468/**
1469 * Check whether blog is public before returning sites.
1470 *
1471 * @since 2.1.0
1472 *
1473 * @param mixed $sites Will return if blog is public, will not return if not public.
1474

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