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/wp-includes/load.php

https://github.com/dipakdotyadav/WordPress
PHP | 762 lines | 357 code | 90 blank | 315 comment | 114 complexity | 98d18350e2b66c58f87100cc06dd6557 MD5 | raw file
  1<?php
  2/**
  3 * These functions are needed to load WordPress.
  4 *
  5 * @internal This file must be parsable by PHP4.
  6 *
  7 * @package WordPress
  8 */
  9
 10/**
 11 * Turn register globals off.
 12 *
 13 * @access private
 14 * @since 2.1.0
 15 * @return null Will return null if register_globals PHP directive was disabled
 16 */
 17function wp_unregister_GLOBALS() {
 18	if ( !ini_get( 'register_globals' ) )
 19		return;
 20
 21	if ( isset( $_REQUEST['GLOBALS'] ) )
 22		die( 'GLOBALS overwrite attempt detected' );
 23
 24	// Variables that shouldn't be unset
 25	$no_unset = array( 'GLOBALS', '_GET', '_POST', '_COOKIE', '_REQUEST', '_SERVER', '_ENV', '_FILES', 'table_prefix' );
 26
 27	$input = array_merge( $_GET, $_POST, $_COOKIE, $_SERVER, $_ENV, $_FILES, isset( $_SESSION ) && is_array( $_SESSION ) ? $_SESSION : array() );
 28	foreach ( $input as $k => $v )
 29		if ( !in_array( $k, $no_unset ) && isset( $GLOBALS[$k] ) ) {
 30			$GLOBALS[$k] = null;
 31			unset( $GLOBALS[$k] );
 32		}
 33}
 34
 35/**
 36 * Fix $_SERVER variables for various setups.
 37 *
 38 * @access private
 39 * @since 3.0.0
 40 */
 41function wp_fix_server_vars() {
 42	global $PHP_SELF;
 43
 44	$default_server_values = array(
 45		'SERVER_SOFTWARE' => '',
 46		'REQUEST_URI' => '',
 47	);
 48
 49	$_SERVER = array_merge( $default_server_values, $_SERVER );
 50
 51	// Fix for IIS when running with PHP ISAPI
 52	if ( empty( $_SERVER['REQUEST_URI'] ) || ( php_sapi_name() != 'cgi-fcgi' && preg_match( '/^Microsoft-IIS\//', $_SERVER['SERVER_SOFTWARE'] ) ) ) {
 53
 54		// IIS Mod-Rewrite
 55		if ( isset( $_SERVER['HTTP_X_ORIGINAL_URL'] ) ) {
 56			$_SERVER['REQUEST_URI'] = $_SERVER['HTTP_X_ORIGINAL_URL'];
 57		}
 58		// IIS Isapi_Rewrite
 59		else if ( isset( $_SERVER['HTTP_X_REWRITE_URL'] ) ) {
 60			$_SERVER['REQUEST_URI'] = $_SERVER['HTTP_X_REWRITE_URL'];
 61		} else {
 62			// Use ORIG_PATH_INFO if there is no PATH_INFO
 63			if ( !isset( $_SERVER['PATH_INFO'] ) && isset( $_SERVER['ORIG_PATH_INFO'] ) )
 64				$_SERVER['PATH_INFO'] = $_SERVER['ORIG_PATH_INFO'];
 65
 66			// Some IIS + PHP configurations puts the script-name in the path-info (No need to append it twice)
 67			if ( isset( $_SERVER['PATH_INFO'] ) ) {
 68				if ( $_SERVER['PATH_INFO'] == $_SERVER['SCRIPT_NAME'] )
 69					$_SERVER['REQUEST_URI'] = $_SERVER['PATH_INFO'];
 70				else
 71					$_SERVER['REQUEST_URI'] = $_SERVER['SCRIPT_NAME'] . $_SERVER['PATH_INFO'];
 72			}
 73
 74			// Append the query string if it exists and isn't null
 75			if ( ! empty( $_SERVER['QUERY_STRING'] ) ) {
 76				$_SERVER['REQUEST_URI'] .= '?' . $_SERVER['QUERY_STRING'];
 77			}
 78		}
 79	}
 80
 81	// Fix for PHP as CGI hosts that set SCRIPT_FILENAME to something ending in php.cgi for all requests
 82	if ( isset( $_SERVER['SCRIPT_FILENAME'] ) && ( strpos( $_SERVER['SCRIPT_FILENAME'], 'php.cgi' ) == strlen( $_SERVER['SCRIPT_FILENAME'] ) - 7 ) )
 83		$_SERVER['SCRIPT_FILENAME'] = $_SERVER['PATH_TRANSLATED'];
 84
 85	// Fix for Dreamhost and other PHP as CGI hosts
 86	if ( strpos( $_SERVER['SCRIPT_NAME'], 'php.cgi' ) !== false )
 87		unset( $_SERVER['PATH_INFO'] );
 88
 89	// Fix empty PHP_SELF
 90	$PHP_SELF = $_SERVER['PHP_SELF'];
 91	if ( empty( $PHP_SELF ) )
 92		$_SERVER['PHP_SELF'] = $PHP_SELF = preg_replace( '/(\?.*)?$/', '', $_SERVER["REQUEST_URI"] );
 93}
 94
 95/**
 96 * Check for the required PHP version, and the MySQL extension or a database drop-in.
 97 *
 98 * Dies if requirements are not met.
 99 *
100 * @access private
101 * @since 3.0.0
102 */
103function wp_check_php_mysql_versions() {
104	global $required_php_version, $wp_version;
105	$php_version = phpversion();
106	if ( version_compare( $required_php_version, $php_version, '>' ) ) {
107		wp_load_translations_early();
108		die( sprintf( __( 'Your server is running PHP version %1$s but WordPress %2$s requires at least %3$s.' ), $php_version, $wp_version, $required_php_version ) );
109	}
110
111	if ( ! extension_loaded( 'mysql' ) && ! file_exists( WP_CONTENT_DIR . '/db.php' ) ) {
112		wp_load_translations_early();
113		die( __( 'Your PHP installation appears to be missing the MySQL extension which is required by WordPress.' ) );
114	}
115}
116
117/**
118 * Don't load all of WordPress when handling a favicon.ico request.
119 * Instead, send the headers for a zero-length favicon and bail.
120 *
121 * @since 3.0.0
122 */
123function wp_favicon_request() {
124	if ( '/favicon.ico' == $_SERVER['REQUEST_URI'] ) {
125		header('Content-Type: image/vnd.microsoft.icon');
126		header('Content-Length: 0');
127		exit;
128	}
129}
130
131/**
132 * Dies with a maintenance message when conditions are met.
133 *
134 * Checks for a file in the WordPress root directory named ".maintenance".
135 * This file will contain the variable $upgrading, set to the time the file
136 * was created. If the file was created less than 10 minutes ago, WordPress
137 * enters maintenance mode and displays a message.
138 *
139 * The default message can be replaced by using a drop-in (maintenance.php in
140 * the wp-content directory).
141 *
142 * @access private
143 * @since 3.0.0
144 */
145function wp_maintenance() {
146	if ( !file_exists( ABSPATH . '.maintenance' ) || defined( 'WP_INSTALLING' ) )
147		return;
148
149	global $upgrading;
150
151	include( ABSPATH . '.maintenance' );
152	// If the $upgrading timestamp is older than 10 minutes, don't die.
153	if ( ( time() - $upgrading ) >= 600 )
154		return;
155
156	if ( file_exists( WP_CONTENT_DIR . '/maintenance.php' ) ) {
157		require_once( WP_CONTENT_DIR . '/maintenance.php' );
158		die();
159	}
160
161	wp_load_translations_early();
162
163	$protocol = $_SERVER["SERVER_PROTOCOL"];
164	if ( 'HTTP/1.1' != $protocol && 'HTTP/1.0' != $protocol )
165		$protocol = 'HTTP/1.0';
166	header( "$protocol 503 Service Unavailable", true, 503 );
167	header( 'Content-Type: text/html; charset=utf-8' );
168	header( 'Retry-After: 600' );
169?>
170	<!DOCTYPE html>
171	<html xmlns="http://www.w3.org/1999/xhtml"<?php if ( is_rtl() ) echo ' dir="rtl"'; ?>>
172	<head>
173	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
174		<title><?php _e( 'Maintenance' ); ?></title>
175
176	</head>
177	<body>
178		<h1><?php _e( 'Briefly unavailable for scheduled maintenance. Check back in a minute.' ); ?></h1>
179	</body>
180	</html>
181<?php
182	die();
183}
184
185/**
186 * PHP 5 standard microtime start capture.
187 *
188 * @access private
189 * @since 0.71
190 * @global float $timestart Seconds from when function is called.
191 * @return bool Always returns true.
192 */
193function timer_start() {
194	global $timestart;
195	$timestart = microtime( true );
196	return true;
197}
198
199/**
200 * Return and/or display the time from the page start to when function is called.
201 *
202 * You can get the results and print them by doing:
203 * <code>
204 * $nTimePageTookToExecute = timer_stop();
205 * echo $nTimePageTookToExecute;
206 * </code>
207 *
208 * Or instead, you can do:
209 * <code>
210 * timer_stop(1);
211 * </code>
212 * which will do what the above does. If you need the result, you can assign it to a variable, but
213 * in most cases, you only need to echo it.
214 *
215 * @since 0.71
216 * @global float $timestart Seconds from when timer_start() is called
217 * @global float $timeend Seconds from when function is called
218 *
219 * @param int $display Use '0' or null to not echo anything and 1 to echo the total time
220 * @param int $precision The amount of digits from the right of the decimal to display. Default is 3.
221 * @return float The "second.microsecond" finished time calculation
222 */
223function timer_stop( $display = 0, $precision = 3 ) { // if called like timer_stop(1), will echo $timetotal
224	global $timestart, $timeend;
225	$timeend = microtime( true );
226	$timetotal = $timeend - $timestart;
227	$r = ( function_exists( 'number_format_i18n' ) ) ? number_format_i18n( $timetotal, $precision ) : number_format( $timetotal, $precision );
228	if ( $display )
229		echo $r;
230	return $r;
231}
232
233/**
234 * Sets PHP error handling and handles WordPress debug mode.
235 *
236 * Uses three constants: WP_DEBUG, WP_DEBUG_DISPLAY, and WP_DEBUG_LOG. All three can be
237 * defined in wp-config.php. Example: <code> define( 'WP_DEBUG', true ); </code>
238 *
239 * WP_DEBUG_DISPLAY and WP_DEBUG_LOG perform no function unless WP_DEBUG is true.
240 * WP_DEBUG defaults to false.
241 *
242 * When WP_DEBUG is true, all PHP notices are reported. WordPress will also display
243 * notices, including one when a deprecated WordPress function, function argument,
244 * or file is used. Deprecated code may be removed from a later version.
245 *
246 * It is strongly recommended that plugin and theme developers use WP_DEBUG in their
247 * development environments.
248 *
249 * When WP_DEBUG_DISPLAY is true, WordPress will force errors to be displayed.
250 * WP_DEBUG_DISPLAY defaults to true. Defining it as null prevents WordPress from
251 * changing the global configuration setting. Defining WP_DEBUG_DISPLAY as false
252 * will force errors to be hidden.
253 *
254 * When WP_DEBUG_LOG is true, errors will be logged to wp-content/debug.log.
255 * WP_DEBUG_LOG defaults to false.
256 *
257 * @access private
258 * @since 3.0.0
259 */
260function wp_debug_mode() {
261	if ( WP_DEBUG ) {
262		// E_DEPRECATED is a core PHP constant in PHP 5.3. Don't define this yourself.
263		// The two statements are equivalent, just one is for 5.3+ and for less than 5.3.
264		if ( defined( 'E_DEPRECATED' ) )
265			error_reporting( E_ALL & ~E_DEPRECATED & ~E_STRICT );
266		else
267			error_reporting( E_ALL );
268
269		if ( WP_DEBUG_DISPLAY )
270			ini_set( 'display_errors', 1 );
271		elseif ( null !== WP_DEBUG_DISPLAY )
272			ini_set( 'display_errors', 0 );
273
274		if ( WP_DEBUG_LOG ) {
275			ini_set( 'log_errors', 1 );
276			ini_set( 'error_log', WP_CONTENT_DIR . '/debug.log' );
277		}
278	} else {
279		error_reporting( E_CORE_ERROR | E_CORE_WARNING | E_COMPILE_ERROR | E_ERROR | E_WARNING | E_PARSE | E_USER_ERROR | E_USER_WARNING | E_RECOVERABLE_ERROR );
280	}
281}
282
283/**
284 * Sets the location of the language directory.
285 *
286 * To set directory manually, define <code>WP_LANG_DIR</code> in wp-config.php.
287 *
288 * If the language directory exists within WP_CONTENT_DIR, that is used.
289 * Otherwise if the language directory exists within WPINC, that's used.
290 * Finally, if neither of the preceding directories are found,
291 * WP_CONTENT_DIR/languages is used.
292 *
293 * The WP_LANG_DIR constant was introduced in 2.1.0.
294 *
295 * @access private
296 * @since 3.0.0
297 */
298function wp_set_lang_dir() {
299	if ( !defined( 'WP_LANG_DIR' ) ) {
300		if ( file_exists( WP_CONTENT_DIR . '/languages' ) && @is_dir( WP_CONTENT_DIR . '/languages' ) || !@is_dir(ABSPATH . WPINC . '/languages') ) {
301			define( 'WP_LANG_DIR', WP_CONTENT_DIR . '/languages' ); // no leading slash, no trailing slash, full path, not relative to ABSPATH
302			if ( !defined( 'LANGDIR' ) ) {
303				// Old static relative path maintained for limited backwards compatibility - won't work in some cases
304				define( 'LANGDIR', 'wp-content/languages' );
305			}
306		} else {
307			define( 'WP_LANG_DIR', ABSPATH . WPINC . '/languages' ); // no leading slash, no trailing slash, full path, not relative to ABSPATH
308			if ( !defined( 'LANGDIR' ) ) {
309				// Old relative path maintained for backwards compatibility
310				define( 'LANGDIR', WPINC . '/languages' );
311			}
312		}
313	}
314}
315
316/**
317 * Load the correct database class file.
318 *
319 * This function is used to load the database class file either at runtime or by
320 * wp-admin/setup-config.php. We must globalize $wpdb to ensure that it is
321 * defined globally by the inline code in wp-db.php.
322 *
323 * @since 2.5.0
324 * @global $wpdb WordPress Database Object
325 */
326function require_wp_db() {
327	global $wpdb;
328
329	require_once( ABSPATH . WPINC . '/wp-db.php' );
330	if ( file_exists( WP_CONTENT_DIR . '/db.php' ) )
331		require_once( WP_CONTENT_DIR . '/db.php' );
332
333	if ( isset( $wpdb ) )
334		return;
335
336	$wpdb = new wpdb( DB_USER, DB_PASSWORD, DB_NAME, DB_HOST );
337}
338
339/**
340 * Sets the database table prefix and the format specifiers for database table columns.
341 *
342 * Columns not listed here default to %s.
343 *
344 * @see wpdb::$field_types Since 2.8.0
345 * @see wpdb::prepare()
346 * @see wpdb::insert()
347 * @see wpdb::update()
348 * @see wpdb::set_prefix()
349 *
350 * @access private
351 * @since 3.0.0
352 */
353function wp_set_wpdb_vars() {
354	global $wpdb, $table_prefix;
355	if ( !empty( $wpdb->error ) )
356		dead_db();
357
358	$wpdb->field_types = array( 'post_author' => '%d', 'post_parent' => '%d', 'menu_order' => '%d', 'term_id' => '%d', 'term_group' => '%d', 'term_taxonomy_id' => '%d',
359		'parent' => '%d', 'count' => '%d','object_id' => '%d', 'term_order' => '%d', 'ID' => '%d', 'comment_ID' => '%d', 'comment_post_ID' => '%d', 'comment_parent' => '%d',
360		'user_id' => '%d', 'link_id' => '%d', 'link_owner' => '%d', 'link_rating' => '%d', 'option_id' => '%d', 'blog_id' => '%d', 'meta_id' => '%d', 'post_id' => '%d',
361		'user_status' => '%d', 'umeta_id' => '%d', 'comment_karma' => '%d', 'comment_count' => '%d',
362		// multisite:
363		'active' => '%d', 'cat_id' => '%d', 'deleted' => '%d', 'lang_id' => '%d', 'mature' => '%d', 'public' => '%d', 'site_id' => '%d', 'spam' => '%d',
364	);
365
366	$prefix = $wpdb->set_prefix( $table_prefix );
367
368	if ( is_wp_error( $prefix ) ) {
369		wp_load_translations_early();
370		wp_die( __( '<strong>ERROR</strong>: <code>$table_prefix</code> in <code>wp-config.php</code> can only contain numbers, letters, and underscores.' ) );
371	}
372}
373
374/**
375 * Starts the WordPress object cache.
376 *
377 * If an object-cache.php file exists in the wp-content directory,
378 * it uses that drop-in as an external object cache.
379 *
380 * @access private
381 * @since 3.0.0
382 */
383function wp_start_object_cache() {
384	global $_wp_using_ext_object_cache, $blog_id;
385
386	$first_init = false;
387 	if ( ! function_exists( 'wp_cache_init' ) ) {
388		if ( file_exists( WP_CONTENT_DIR . '/object-cache.php' ) ) {
389			require_once ( WP_CONTENT_DIR . '/object-cache.php' );
390			$_wp_using_ext_object_cache = true;
391		} else {
392			require_once ( ABSPATH . WPINC . '/cache.php' );
393			$_wp_using_ext_object_cache = false;
394		}
395		$first_init = true;
396	} else if ( !$_wp_using_ext_object_cache && file_exists( WP_CONTENT_DIR . '/object-cache.php' ) ) {
397		// Sometimes advanced-cache.php can load object-cache.php before it is loaded here.
398		// This breaks the function_exists check above and can result in $_wp_using_ext_object_cache
399		// being set incorrectly. Double check if an external cache exists.
400		$_wp_using_ext_object_cache = true;
401	}
402
403	// If cache supports reset, reset instead of init if already initialized.
404	// Reset signals to the cache that global IDs have changed and it may need to update keys
405	// and cleanup caches.
406	if ( ! $first_init && function_exists( 'wp_cache_switch_to_blog' ) )
407		wp_cache_switch_to_blog( $blog_id );
408	else
409		wp_cache_init();
410
411	if ( function_exists( 'wp_cache_add_global_groups' ) ) {
412		wp_cache_add_global_groups( array( 'users', 'userlogins', 'usermeta', 'user_meta', 'site-transient', 'site-options', 'site-lookup', 'blog-lookup', 'blog-details', 'rss', 'global-posts', 'blog-id-cache' ) );
413		wp_cache_add_non_persistent_groups( array( 'comment', 'counts', 'plugins' ) );
414	}
415}
416
417/**
418 * Redirects to the installer if WordPress is not installed.
419 *
420 * Dies with an error message when multisite is enabled.
421 *
422 * @access private
423 * @since 3.0.0
424 */
425function wp_not_installed() {
426	if ( is_multisite() ) {
427		if ( ! is_blog_installed() && ! defined( 'WP_INSTALLING' ) )
428			wp_die( __( 'The site you have requested is not installed properly. Please contact the system administrator.' ) );
429	} elseif ( ! is_blog_installed() && false === strpos( $_SERVER['PHP_SELF'], 'install.php' ) && !defined( 'WP_INSTALLING' ) ) {
430
431		$link = wp_guess_url() . '/wp-admin/install.php';
432
433		require( ABSPATH . WPINC . '/kses.php' );
434		require( ABSPATH . WPINC . '/pluggable.php' );
435		require( ABSPATH . WPINC . '/formatting.php' );
436		wp_redirect( $link );
437		die();
438	}
439}
440
441/**
442 * Returns array of must-use plugin files to be included in global scope.
443 *
444 * The default directory is wp-content/mu-plugins. To change the default directory
445 * manually, define <code>WPMU_PLUGIN_DIR</code> and <code>WPMU_PLUGIN_URL</code>
446 * in wp-config.php.
447 *
448 * @access private
449 * @since 3.0.0
450 * @return array Files to include
451 */
452function wp_get_mu_plugins() {
453	$mu_plugins = array();
454	if ( !is_dir( WPMU_PLUGIN_DIR ) )
455		return $mu_plugins;
456	if ( ! $dh = opendir( WPMU_PLUGIN_DIR ) )
457		return $mu_plugins;
458	while ( ( $plugin = readdir( $dh ) ) !== false ) {
459		if ( substr( $plugin, -4 ) == '.php' )
460			$mu_plugins[] = WPMU_PLUGIN_DIR . '/' . $plugin;
461	}
462	closedir( $dh );
463	sort( $mu_plugins );
464
465	return $mu_plugins;
466}
467
468/**
469 * Returns array of plugin files to be included in global scope.
470 *
471 * The default directory is wp-content/plugins. To change the default directory
472 * manually, define <code>WP_PLUGIN_DIR</code> and <code>WP_PLUGIN_URL</code>
473 * in wp-config.php.
474 *
475 * @access private
476 * @since 3.0.0
477 * @return array Files to include
478 */
479function wp_get_active_and_valid_plugins() {
480	$plugins = array();
481	$active_plugins = (array) get_option( 'active_plugins', array() );
482
483	// Check for hacks file if the option is enabled
484	if ( get_option( 'hack_file' ) && file_exists( ABSPATH . 'my-hacks.php' ) ) {
485		_deprecated_file( 'my-hacks.php', '1.5' );
486		array_unshift( $plugins, ABSPATH . 'my-hacks.php' );
487	}
488
489	if ( empty( $active_plugins ) || defined( 'WP_INSTALLING' ) )
490		return $plugins;
491
492	$network_plugins = is_multisite() ? wp_get_active_network_plugins() : false;
493
494	foreach ( $active_plugins as $plugin ) {
495		if ( ! validate_file( $plugin ) // $plugin must validate as file
496			&& '.php' == substr( $plugin, -4 ) // $plugin must end with '.php'
497			&& file_exists( WP_PLUGIN_DIR . '/' . $plugin ) // $plugin must exist
498			// not already included as a network plugin
499			&& ( ! $network_plugins || ! in_array( WP_PLUGIN_DIR . '/' . $plugin, $network_plugins ) )
500			)
501		$plugins[] = WP_PLUGIN_DIR . '/' . $plugin;
502	}
503	return $plugins;
504}
505
506/**
507 * Sets internal encoding using mb_internal_encoding().
508 *
509 * In most cases the default internal encoding is latin1, which is of no use,
510 * since we want to use the mb_ functions for utf-8 strings.
511 *
512 * @access private
513 * @since 3.0.0
514 */
515function wp_set_internal_encoding() {
516	if ( function_exists( 'mb_internal_encoding' ) ) {
517		$charset = get_option( 'blog_charset' );
518		if ( ! $charset || ! @mb_internal_encoding( $charset ) )
519			mb_internal_encoding( 'UTF-8' );
520	}
521}
522
523/**
524 * Add magic quotes to $_GET, $_POST, $_COOKIE, and $_SERVER.
525 *
526 * Also forces $_REQUEST to be $_GET + $_POST. If $_SERVER, $_COOKIE,
527 * or $_ENV are needed, use those superglobals directly.
528 *
529 * @access private
530 * @since 3.0.0
531 */
532function wp_magic_quotes() {
533	// If already slashed, strip.
534	if ( get_magic_quotes_gpc() ) {
535		$_GET    = stripslashes_deep( $_GET    );
536		$_POST   = stripslashes_deep( $_POST   );
537		$_COOKIE = stripslashes_deep( $_COOKIE );
538	}
539
540	// Escape with wpdb.
541	$_GET    = add_magic_quotes( $_GET    );
542	$_POST   = add_magic_quotes( $_POST   );
543	$_COOKIE = add_magic_quotes( $_COOKIE );
544	$_SERVER = add_magic_quotes( $_SERVER );
545
546	// Force REQUEST to be GET + POST.
547	$_REQUEST = array_merge( $_GET, $_POST );
548}
549
550/**
551 * Runs just before PHP shuts down execution.
552 *
553 * @access private
554 * @since 1.2.0
555 */
556function shutdown_action_hook() {
557	do_action( 'shutdown' );
558	wp_cache_close();
559}
560
561/**
562 * Copy an object.
563 *
564 * @since 2.7.0
565 * @deprecated 3.2
566 *
567 * @param object $object The object to clone
568 * @return object The cloned object
569 */
570
571function wp_clone( $object ) {
572	// Use parens for clone to accommodate PHP 4. See #17880
573	return clone( $object );
574}
575
576/**
577 * Whether the current request is for a network or blog admin page
578 *
579 * Does not inform on whether the user is an admin! Use capability checks to
580 * tell if the user should be accessing a section or not.
581 *
582 * @since 1.5.1
583 *
584 * @return bool True if inside WordPress administration pages.
585 */
586function is_admin() {
587	if ( isset( $GLOBALS['current_screen'] ) )
588		return $GLOBALS['current_screen']->in_admin();
589	elseif ( defined( 'WP_ADMIN' ) )
590		return WP_ADMIN;
591
592	return false;
593}
594
595/**
596 * Whether the current request is for a blog admin screen /wp-admin/
597 *
598 * Does not inform on whether the user is a blog admin! Use capability checks to
599 * tell if the user should be accessing a section or not.
600 *
601 * @since 3.1.0
602 *
603 * @return bool True if inside WordPress network administration pages.
604 */
605function is_blog_admin() {
606	if ( isset( $GLOBALS['current_screen'] ) )
607		return $GLOBALS['current_screen']->in_admin( 'site' );
608	elseif ( defined( 'WP_BLOG_ADMIN' ) )
609		return WP_BLOG_ADMIN;
610
611	return false;
612}
613
614/**
615 * Whether the current request is for a network admin screen /wp-admin/network/
616 *
617 * Does not inform on whether the user is a network admin! Use capability checks to
618 * tell if the user should be accessing a section or not.
619 *
620 * @since 3.1.0
621 *
622 * @return bool True if inside WordPress network administration pages.
623 */
624function is_network_admin() {
625	if ( isset( $GLOBALS['current_screen'] ) )
626		return $GLOBALS['current_screen']->in_admin( 'network' );
627	elseif ( defined( 'WP_NETWORK_ADMIN' ) )
628		return WP_NETWORK_ADMIN;
629
630	return false;
631}
632
633/**
634 * Whether the current request is for a user admin screen /wp-admin/user/
635 *
636 * Does not inform on whether the user is an admin! Use capability checks to
637 * tell if the user should be accessing a section or not.
638 *
639 * @since 3.1.0
640 *
641 * @return bool True if inside WordPress user administration pages.
642 */
643function is_user_admin() {
644	if ( isset( $GLOBALS['current_screen'] ) )
645		return $GLOBALS['current_screen']->in_admin( 'user' );
646	elseif ( defined( 'WP_USER_ADMIN' ) )
647		return WP_USER_ADMIN;
648
649	return false;
650}
651
652/**
653 * Whether Multisite support is enabled
654 *
655 * @since 3.0.0
656 *
657 * @return bool True if multisite is enabled, false otherwise.
658 */
659function is_multisite() {
660	if ( defined( 'MULTISITE' ) )
661		return MULTISITE;
662
663	if ( defined( 'SUBDOMAIN_INSTALL' ) || defined( 'VHOST' ) || defined( 'SUNRISE' ) )
664		return true;
665
666	return false;
667}
668
669/**
670 * Retrieve the current blog id
671 *
672 * @since 3.1.0
673 *
674 * @return int Blog id
675 */
676function get_current_blog_id() {
677	global $blog_id;
678	return absint($blog_id);
679}
680
681/**
682 * Attempts an early load of translations.
683 *
684 * Used for errors encountered during the initial loading process, before the locale has been
685 * properly detected and loaded.
686 *
687 * Designed for unusual load sequences (like setup-config.php) or for when the script will then
688 * terminate with an error, otherwise there is a risk that a file can be double-included.
689 *
690 * @since 3.4.0
691 * @access private
692 */
693function wp_load_translations_early() {
694	global $text_direction, $wp_locale;
695
696	static $loaded = false;
697	if ( $loaded )
698		return;
699	$loaded = true;
700
701	if ( function_exists( 'did_action' ) && did_action( 'init' ) )
702		return;
703
704	// We need $wp_local_package
705	require ABSPATH . WPINC . '/version.php';
706
707	// Translation and localization
708	require_once ABSPATH . WPINC . '/pomo/mo.php';
709	require_once ABSPATH . WPINC . '/l10n.php';
710	require_once ABSPATH . WPINC . '/locale.php';
711
712	// General libraries
713	require_once ABSPATH . WPINC . '/plugin.php';
714
715	$locales = $locations = array();
716
717	while ( true ) {
718		if ( defined( 'WPLANG' ) ) {
719			if ( '' == WPLANG )
720				break;
721			$locales[] = WPLANG;
722		}
723
724		if ( isset( $wp_local_package ) )
725			$locales[] = $wp_local_package;
726
727		if ( ! $locales )
728			break;
729
730		if ( defined( 'WP_LANG_DIR' ) && @is_dir( WP_LANG_DIR ) )
731			$locations[] = WP_LANG_DIR;
732
733		if ( defined( 'WP_CONTENT_DIR' ) && @is_dir( WP_CONTENT_DIR . '/languages' ) )
734			$locations[] = WP_CONTENT_DIR . '/languages';
735
736		if ( @is_dir( ABSPATH . 'wp-content/languages' ) )
737			$locations[] = ABSPATH . 'wp-content/languages';
738
739		if ( @is_dir( ABSPATH . WPINC . '/languages' ) )
740			$locations[] = ABSPATH . WPINC . '/languages';
741
742		if ( ! $locations )
743			break;
744
745		$locations = array_unique( $locations );
746
747		foreach ( $locales as $locale ) {
748			foreach ( $locations as $location ) {
749				if ( file_exists( $location . '/' . $locale . '.mo' ) ) {
750					load_textdomain( 'default', $location . '/' . $locale . '.mo' );
751					if ( defined( 'WP_SETUP_CONFIG' ) && file_exists( $location . '/admin-' . $locale . '.mo' ) )
752						load_textdomain( 'default', $location . '/admin-' . $locale . '.mo' );
753					break 2;
754				}
755			}
756		}
757
758		break;
759	}
760
761	$wp_locale = new WP_Locale();
762}