/wordpress/wp-admin/includes/media.php

<?php
/**
 * WordPress Administration Media API.
 *
 * @package WordPress
 * @subpackage Administration
 */

/**
 * Defines the default media upload tabs
 *
 * @since 2.5.0
 *
 * @return array default tabs
 */
function media_upload_tabs() {
	$_default_tabs = array(
		'type' => __('From Computer'), // handler action suffix => tab text
		'type_url' => __('From URL'),
		'gallery' => __('Gallery'),
		'library' => __('Media Library')
	);

	return apply_filters('media_upload_tabs', $_default_tabs);
}

/**
 * Adds the gallery tab back to the tabs array if post has image attachments
 *
 * @since 2.5.0
 *
 * @param array $tabs
 * @return array $tabs with gallery if post has image attachment
 */
function update_gallery_tab($tabs) {
	global $wpdb;

	if ( !isset($_REQUEST['post_id']) ) {
		unset($tabs['gallery']);
		return $tabs;
	}

	$post_id = intval($_REQUEST['post_id']);

	if ( $post_id )
		$attachments = intval( $wpdb->get_var( $wpdb->prepare( "SELECT count(*) FROM $wpdb->posts WHERE post_type = 'attachment' AND post_status != 'trash' AND post_parent = %d", $post_id ) ) );

	if ( empty($attachments) ) {
		unset($tabs['gallery']);
		return $tabs;
	}

	$tabs['gallery'] = sprintf(__('Gallery (%s)'), "<span id='attachments-count'>$attachments</span>");

	return $tabs;
}
add_filter('media_upload_tabs', 'update_gallery_tab');

/**
 * {@internal Missing Short Description}}
 *
 * @since 2.5.0
 */
function the_media_upload_tabs() {
	global $redir_tab;
	$tabs = media_upload_tabs();
	$default = 'type';

	if ( !empty($tabs) ) {
		echo "<ul id='sidemenu'>\n";
		if ( isset($redir_tab) && array_key_exists($redir_tab, $tabs) )
			$current = $redir_tab;
		elseif ( isset($_GET['tab']) && array_key_exists($_GET['tab'], $tabs) )
			$current = $_GET['tab'];
		else
			$current = apply_filters('media_upload_default_tab', $default);

		foreach ( $tabs as $callback => $text ) {
			$class = '';

			if ( $current == $callback )
				$class = " class='current'";

			$href = add_query_arg(array('tab' => $callback, 's' => false, 'paged' => false, 'post_mime_type' => false, 'm' => false));
			$link = "<a href='" . esc_url($href) . "'$class>$text</a>";
			echo "\t<li id='" . esc_attr("tab-$callback") . "'>$link</li>\n";
		}
		echo "</ul>\n";
	}
}

/**
 * {@internal Missing Short Description}}
 *
 * @since 2.5.0
 *
 * @param integer $id image attachment id
 * @param string $caption image caption
 * @param string $alt image alt attribute
 * @param string $title image title attribute
 * @param string $align image css alignment property
 * @param string $url image src url
 * @param string|bool $rel image rel attribute
 * @param string $size image size (thumbnail, medium, large, full or added  with add_image_size() )
 * @return string the html to insert into editor
 */
function get_image_send_to_editor($id, $caption, $title, $align, $url='', $rel = false, $size='medium', $alt = '') {

	$html = get_image_tag($id, $alt, '', $align, $size);

	$rel = $rel ? ' rel="attachment wp-att-' . esc_attr($id).'"' : '';

	if ( $url )
		$html = '<a href="' . esc_attr($url) . "\"$rel>$html</a>";

	$html = apply_filters( 'image_send_to_editor', $html, $id, $caption, $title, $align, $url, $size, $alt );

	return $html;
}

/**
 * Adds image shortcode with caption to editor
 *
 * @since 2.6.0
 *
 * @param string $html
 * @param integer $id
 * @param string $caption image caption
 * @param string $alt image alt attribute
 * @param string $title image title attribute
 * @param string $align image css alignment property
 * @param string $url image src url
 * @param string $size image size (thumbnail, medium, large, full or added with add_image_size() )
 * @return string
 */
function image_add_caption( $html, $id, $caption, $title, $align, $url, $size, $alt = '' ) {

	if ( empty($caption) || apply_filters( 'disable_captions', '' ) )
		return $html;

	$id = ( 0 < (int) $id ) ? 'attachment_' . $id : '';

	if ( ! preg_match( '/width=["\']([0-9]+)/', $html, $matches ) )
		return $html;

	$width = $matches[1];

	$caption = str_replace( array("\r\n", "\r"), "\n", $caption);
	$caption = preg_replace_callback( '/<[a-zA-Z0-9]+(?: [^<>]+>)*/', '_cleanup_image_add_caption', $caption );
	// convert any remaining line breaks to <br>
	$caption = preg_replace( '/[ \n\t]*\n[ \t]*/', '<br />', $caption );

	$html = preg_replace( '/(class=["\'][^\'"]*)align(none|left|right|center)\s?/', '$1', $html );
	if ( empty($align) )
		$align = 'none';

	$shcode = '[caption id="' . $id . '" align="align' . $align	. '" width="' . $width . '"]' . $html . ' ' . $caption . '[/caption]';

	return apply_filters( 'image_add_caption_shortcode', $shcode, $html );
}
add_filter( 'image_send_to_editor', 'image_add_caption', 20, 8 );

/**
 * Private preg_replace callback used in image_add_caption()
 *
 * @access private
 * @since 3.4.0
 */
function _cleanup_image_add_caption( $matches ) {
	// remove any line breaks from inside the tags
	return preg_replace( '/[\r\n\t]+/', ' ', $matches[0] );
}

/**
 * Adds image html to editor
 *
 * @since 2.5.0
 *
 * @param string $html
 */
function media_send_to_editor($html) {
?>
<script type="text/javascript">
/* <![CDATA[ */
var win = window.dialogArguments || opener || parent || top;
win.send_to_editor('<?php echo addslashes($html); ?>');
/* ]]> */
</script>
<?php
	exit;
}

/**
 * This handles the file upload POST itself, creating the attachment post.
 *
 * @since 2.5.0
 *
 * @param string $file_id Index into the {@link $_FILES} array of the upload
 * @param int $post_id The post ID the media is associated with
 * @param array $post_data allows you to overwrite some of the attachment
 * @param array $overrides allows you to override the {@link wp_handle_upload()} behavior
 * @return int the ID of the attachment
 */
function media_handle_upload($file_id, $post_id, $post_data = array(), $overrides = array( 'test_form' => false )) {

	$time = current_time('mysql');
	if ( $post = get_post($post_id) ) {
		if ( substr( $post->post_date, 0, 4 ) > 0 )
			$time = $post->post_date;
	}

	$name = $_FILES[$file_id]['name'];
	$file = wp_handle_upload($_FILES[$file_id], $overrides, $time);

	if ( isset($file['error']) )
		return new WP_Error( 'upload_error', $file['error'] );

	$name_parts = pathinfo($name);
	$name = trim( substr( $name, 0, -(1 + strlen($name_parts['extension'])) ) );

	$url = $file['url'];
	$type = $file['type'];
	$file = $file['file'];
	$title = $name;
	$content = '';

	if ( preg_match( '#^audio#', $type ) ) {
		$meta = wp_read_audio_metadata( $file );

		if ( ! empty( $meta['title'] ) )
			$title = $meta['title'];

		$content = '';

		if ( ! empty( $title ) ) {

			if ( ! empty( $meta['album'] ) && ! empty( $meta['artist'] ) ) {
				/* translators: 1: audio track title, 2: album title, 3: artist name */
				$content .= sprintf( __( '&#8220;%1$s&#8221; from %2$s by %3$s.' ), $title, $meta['album'], $meta['artist'] );
			} else if ( ! empty( $meta['album'] ) ) {
				/* translators: 1: audio track title, 2: album title */
				$content .= sprintf( __( '&#8220;%1$s&#8221; from %2$s.' ), $title, $meta['album'] );
			} else if ( ! empty( $meta['artist'] ) ) {
				/* translators: 1: audio track title, 2: artist name */
				$content .= sprintf( __( '&#8220;%1$s&#8221; by %2$s.' ), $title, $meta['artist'] );
			} else {
				$content .= sprintf( __( '&#8220;%s&#8221;.' ), $title );
			}

		} else if ( ! empty( $meta['album'] ) ) {

			if ( ! empty( $meta['artist'] ) ) {
				/* translators: 1: audio album title, 2: artist name */
				$content .= sprintf( __( '%1$s by %2$s.' ), $meta['album'], $meta['artist'] );
			} else {
				$content .= $meta['album'] . '.';
			}

		} else if ( ! empty( $meta['artist'] ) ) {

			$content .= $meta['artist'] . '.';

		}

		if ( ! empty( $meta['year'] ) )
			$content .= ' ' . sprintf( __( 'Released: %d.' ), $meta['year'] );

		if ( ! empty( $meta['track_number'] ) ) {
			$track_number = explode( '/', $meta['track_number'] );
			if ( isset( $track_number[1] ) )
				$content .= ' ' . sprintf( __( 'Track %1$s of %2$s.' ), number_format_i18n( $track_number[0] ), number_format_i18n( $track_number[1] ) );
			else
				$content .= ' ' . sprintf( __( 'Track %1$s.' ), number_format_i18n( $track_number[0] ) );
		}

		if ( ! empty( $meta['genre'] ) )
			$content .= ' ' . sprintf( __( 'Genre: %s.' ), $meta['genre'] );

	// use image exif/iptc data for title and caption defaults if possible
	} elseif ( $image_meta = @wp_read_image_metadata( $file ) ) {
		if ( trim( $image_meta['title'] ) && ! is_numeric( sanitize_title( $image_meta['title'] ) ) )
			$title = $image_meta['title'];
		if ( trim( $image_meta['caption'] ) )
			$content = $image_meta['caption'];
	}

	// Construct the attachment array
	$attachment = array_merge( array(
		'post_mime_type' => $type,
		'guid' => $url,
		'post_parent' => $post_id,
		'post_title' => $title,
		'post_content' => $content,
	), $post_data );

	// This should never be set as it would then overwrite an existing attachment.
	if ( isset( $attachment['ID'] ) )
		unset( $attachment['ID'] );

	// Save the data
	$id = wp_insert_attachment($attachment, $file, $post_id);
	if ( !is_wp_error($id) ) {
		wp_update_attachment_metadata( $id, wp_generate_attachment_metadata( $id, $file ) );
	}

	return $id;

}

/**
 * This handles a sideloaded file in the same way as an uploaded file is handled by {@link media_handle_upload()}
 *
 * @since 2.6.0
 *
 * @param array $file_array Array similar to a {@link $_FILES} upload array
 * @param int $post_id The post ID the media is associated with
 * @param string $desc Description of the sideloaded file
 * @param array $post_data allows you to overwrite some of the attachment
 * @return int|object The ID of the attachment or a WP_Error on failure
 */
function media_handle_sideload($file_array, $post_id, $desc = null, $post_data = array()) {
	$overrides = array('test_form'=>false);

	$time = current_time( 'mysql' );
	if ( $post = get_post( $post_id ) ) {
		if ( substr( $post->post_date, 0, 4 ) > 0 )
			$time = $post->post_date;
	}

	$file = wp_handle_sideload( $file_array, $overrides, $time );
	if ( isset($file['error']) )
		return new WP_Error( 'upload_error', $file['error'] );

	$url = $file['url'];
	$type = $file['type'];
	$file = $file['file'];
	$title = preg_replace('/\.[^.]+$/', '', basename($file));
	$content = '';

	// use image exif/iptc data for title and caption defaults if possible
	if ( $image_meta = @wp_read_image_metadata($file) ) {
		if ( trim( $image_meta['title'] ) && ! is_numeric( sanitize_title( $image_meta['title'] ) ) )
			$title = $image_meta['title'];
		if ( trim( $image_meta['caption'] ) )
			$content = $image_meta['caption'];
	}

	if ( isset( $desc ) )
		$title = $desc;

	// Construct the attachment array
	$attachment = array_merge( array(
		'post_mime_type' => $type,
		'guid' => $url,
		'post_parent' => $post_id,
		'post_title' => $title,
		'post_content' => $content,
	), $post_data );

	// This should never be set as it would then overwrite an existing attachment.
	if ( isset( $attachment['ID'] ) )
		unset( $attachment['ID'] );

	// Save the attachment metadata
	$id = wp_insert_attachment($attachment, $file, $post_id);
	if ( !is_wp_error($id) )
		wp_update_attachment_metadata( $id, wp_generate_attachment_metadata( $id, $file ) );

	return $id;
}

/**
 * Adds the iframe to display content for the media upload page
 *
 * @since 2.5.0
 *
 * @param array $content_func
 */
function wp_iframe($content_func /* ... */) {
	_wp_admin_html_begin();
?>
<title><?php bloginfo('name') ?> &rsaquo; <?php _e('Uploads'); ?> &#8212; <?php _e('WordPress'); ?></title>
<?php

wp_enqueue_style( 'colors' );
// Check callback name for 'media'
if ( ( is_array( $content_func ) && ! empty( $content_func[1] ) && 0 === strpos( (string) $content_func[1], 'media' ) )
	|| ( ! is_array( $content_func ) && 0 === strpos( $content_func, 'media' ) ) )
	wp_enqueue_style( 'media' );
wp_enqueue_style( 'ie' );
?>
<script type="text/javascript">
//<![CDATA[
addLoadEvent = function(func){if(typeof jQuery!="undefined")jQuery(document).ready(func);else if(typeof wpOnload!='function'){wpOnload=func;}else{var oldonload=wpOnload;wpOnload=function(){oldonload();func();}}};
var ajaxurl = '<?php echo admin_url( 'admin-ajax.php', 'relative' ); ?>', pagenow = 'media-upload-popup', adminpage = 'media-upload-popup',
isRtl = <?php echo (int) is_rtl(); ?>;
//]]>
</script>
<?php
do_action('admin_enqueue_scripts', 'media-upload-popup');
do_action('admin_print_styles-media-upload-popup');
do_action('admin_print_styles');
do_action('admin_print_scripts-media-upload-popup');
do_action('admin_print_scripts');
do_action('admin_head-media-upload-popup');
do_action('admin_head');

if ( is_string($content_func) )
	do_action( "admin_head_{$content_func}" );
?>
</head>
<body<?php if ( isset($GLOBALS['body_id']) ) echo ' id="' . $GLOBALS['body_id'] . '"'; ?> class="wp-core-ui no-js">
<script type="text/javascript">
document.body.className = document.body.className.replace('no-js', 'js');
</script>
<?php
	$args = func_get_args();
	$args = array_slice($args, 1);
	call_user_func_array($content_func, $args);

	do_action('admin_print_footer_scripts');
?>
<script type="text/javascript">if(typeof wpOnload=='function')wpOnload();</script>
</body>
</html>
<?php
}

/**
 * Adds the media button to the editor
 *
 * @since 2.5.0
 *
 * @param string $editor_id
 */
function media_buttons($editor_id = 'content') {
	$post = get_post();
	if ( ! $post && ! empty( $GLOBALS['post_ID'] ) )
		$post = $GLOBALS['post_ID'];

	wp_enqueue_media( array(
		'post' => $post
	) );

	$img = '<span class="wp-media-buttons-icon"></span> ';

	echo '<a href="#" id="insert-media-button" class="button insert-media add_media" data-editor="' . esc_attr( $editor_id ) . '" title="' . esc_attr__( 'Add Media' ) . '">' . $img . __( 'Add Media' ) . '</a>';

	// Don't use this filter. Want to add a button? Use the media_buttons action.
	$legacy_filter = apply_filters('media_buttons_context', ''); // deprecated

	if ( $legacy_filter ) {
		// #WP22559. Close <a> if a plugin started by closing <a> to open their own <a> tag.
		if ( 0 === stripos( trim( $legacy_filter ), '</a>' ) )
			$legacy_filter .= '</a>';
		echo $legacy_filter;
	}
}
add_action( 'media_buttons', 'media_buttons' );

function get_upload_iframe_src( $type = null, $post_id = null, $tab = null ) {
	global $post_ID;

	if ( empty( $post_id ) )
		$post_id = $post_ID;

	$upload_iframe_src = add_query_arg( 'post_id', (int) $post_id, admin_url('media-upload.php') );

	if ( $type && 'media' != $type )
		$upload_iframe_src = add_query_arg('type', $type, $upload_iframe_src);

	if ( ! empty( $tab ) )
		$upload_iframe_src = add_query_arg('tab', $tab, $upload_iframe_src);

	$upload_iframe_src = apply_filters($type . '_upload_iframe_src', $upload_iframe_src);

	return add_query_arg('TB_iframe', true, $upload_iframe_src);
}

/**
 * {@internal Missing Short Description}}
 *
 * @since 2.5.0
 *
 * @return mixed void|object WP_Error on failure
 */
function media_upload_form_handler() {
	check_admin_referer('media-form');

	$errors = null;

	if ( isset($_POST['send']) ) {
		$keys = array_keys($_POST['send']);
		$send_id = (int) array_shift($keys);
	}

	if ( !empty($_POST['attachments']) ) foreach ( $_POST['attachments'] as $attachment_id => $attachment ) {
		$post = $_post = get_post($attachment_id, ARRAY_A);

		if ( !current_user_can( 'edit_post', $attachment_id ) )
			continue;

		if ( isset($attachment['post_content']) )
			$post['post_content'] = $attachment['post_content'];
		if ( isset($attachment['post_title']) )
			$post['post_title'] = $attachment['post_title'];
		if ( isset($attachment['post_excerpt']) )
			$post['post_excerpt'] = $attachment['post_excerpt'];
		if ( isset($attachment['menu_order']) )
			$post['menu_order'] = $attachment['menu_order'];

		if ( isset($send_id) && $attachment_id == $send_id ) {
			if ( isset($attachment['post_parent']) )
				$post['post_parent'] = $attachment['post_parent'];
		}

		$post = apply_filters('attachment_fields_to_save', $post, $attachment);

		if ( isset($attachment['image_alt']) ) {
			$image_alt = wp_unslash( $attachment['image_alt'] );
			if ( $image_alt != get_post_meta($attachment_id, '_wp_attachment_image_alt', true) ) {
				$image_alt = wp_strip_all_tags( $image_alt, true );
				// update_meta expects slashed
				update_post_meta( $attachment_id, '_wp_attachment_image_alt', wp_slash( $image_alt ) );
			}
		}

		if ( isset($post['errors']) ) {
			$errors[$attachment_id] = $post['errors'];
			unset($post['errors']);
		}

		if ( $post != $_post )
			wp_update_post($post);

		foreach ( get_attachment_taxonomies($post) as $t ) {
			if ( isset($attachment[$t]) )
				wp_set_object_terms($attachment_id, array_map('trim', preg_split('/,+/', $attachment[$t])), $t, false);
		}
	}

	if ( isset($_POST['insert-gallery']) || isset($_POST['update-gallery']) ) { ?>
		<script type="text/javascript">
		/* <![CDATA[ */
		var win = window.dialogArguments || opener || parent || top;
		win.tb_remove();
		/* ]]> */
		</script>
		<?php
		exit;
	}

	if ( isset($send_id) ) {
		$attachment = wp_unslash( $_POST['attachments'][$send_id] );

		$html = isset( $attachment['post_title'] ) ? $attachment['post_title'] : '';
		if ( !empty($attachment['url']) ) {
			$rel = '';
			if ( strpos($attachment['url'], 'attachment_id') || get_attachment_link($send_id) == $attachment['url'] )
				$rel = " rel='attachment wp-att-" . esc_attr($send_id) . "'";
			$html = "<a href='{$attachment['url']}'$rel>$html</a>";
		}

		$html = apply_filters('media_send_to_editor', $html, $send_id, $attachment);
		return media_send_to_editor($html);
	}

	return $errors;
}

/**
 * {@internal Missing Short Description}}
 *
 * @since 2.5.0
 *
 * @return mixed
 */
function wp_media_upload_handler() {
	$errors = array();
	$id = 0;

	if ( isset($_POST['html-upload']) && !empty($_FILES) ) {
		check_admin_referer('media-form');
		// Upload File button was clicked
		$id = media_handle_upload('async-upload', $_REQUEST['post_id']);
		unset($_FILES);
		if ( is_wp_error($id) ) {
			$errors['upload_error'] = $id;
			$id = false;
		}
	}

	if ( !empty($_POST['insertonlybutton']) ) {
		$src = $_POST['src'];
		if ( !empty($src) && !strpos($src, '://') )
			$src = "http://$src";

		if ( isset( $_POST['media_type'] ) && 'image' != $_POST['media_type'] ) {
			$title = esc_html( wp_unslash( $_POST['title'] ) );
			if ( empty( $title ) )
				$title = esc_html( basename( $src ) );

			if ( $title && $src )
				$html = "<a href='" . esc_url($src) . "'>$title</a>";

			$type = 'file';
			if ( ( $ext = preg_replace( '/^.+?\.([^.]+)$/', '$1', $src ) ) && ( $ext_type = wp_ext2type( $ext ) )
				&& ( 'audio' == $ext_type || 'video' == $ext_type ) )
					$type = $ext_type;

			$html = apply_filters( $type . '_send_to_editor_url', $html, esc_url_raw( $src ), $title );
		} else {
			$align = '';
			$alt = esc_attr( wp_unslash( $_POST['alt'] ) );
			if ( isset($_POST['align']) ) {
				$align = esc_attr( wp_unslash( $_POST['align'] ) );
				$class = " class='align$align'";
			}
			if ( !empty($src) )
				$html = "<img src='" . esc_url($src) . "' alt='$alt'$class />";

			$html = apply_filters( 'image_send_to_editor_url', $html, esc_url_raw( $src ), $alt, $align );
		}

		return media_send_to_editor($html);
	}

	if ( !empty($_POST) ) {
		$return = media_upload_form_handler();

		if ( is_string($return) )
			return $return;
		if ( is_array($return) )
			$errors = $return;
	}

	if ( isset($_POST['save']) ) {
		$errors['upload_notice'] = __('Saved.');
		return media_upload_gallery();
	}

	if ( isset($_GET['tab']) && $_GET['tab'] == 'type_url' ) {
		$type = 'image';
		if ( isset( $_GET['type'] ) && in_array( $_GET['type'], array( 'video', 'audio', 'file' ) ) )
			$type = $_GET['type'];
		return wp_iframe( 'media_upload_type_url_form', $type, $errors, $id );
	}

	return wp_iframe( 'media_upload_type_form', 'image', $errors, $id );
}

/**
 * Download an image from the specified URL and attach it to a post.
 *
 * @since 2.6.0
 *
 * @param string $file The URL of the image to download
 * @param int $post_id The post ID the media is to be associated with
 * @param string $desc Optional. Description of the image
 * @return string|WP_Error Populated HTML img tag on success
 */
function media_sideload_image($file, $post_id, $desc = null) {
	if ( ! empty($file) ) {
		// Download file to temp location
		$tmp = download_url( $file );

		// Set variables for storage
		// fix file filename for query strings
		preg_match( '/[^\?]+\.(jpe?g|jpe|gif|png)\b/i', $file, $matches );
		$file_array['name'] = basename($matches[0]);
		$file_array['tmp_name'] = $tmp;

		// If error storing temporarily, unlink
		if ( is_wp_error( $tmp ) ) {
			@unlink($file_array['tmp_name']);
			$file_array['tmp_name'] = '';
		}

		// do the validation and storage stuff
		$id = media_handle_sideload( $file_array, $post_id, $desc );
		// If error storing permanently, unlink
		if ( is_wp_error($id) ) {
			@unlink($file_array['tmp_name']);
			return $id;
		}

		$src = wp_get_attachment_url( $id );
	}

	// Finally check to make sure the file has been saved, then return the html
	if ( ! empty($src) ) {
		$alt = isset($desc) ? esc_attr($desc) : '';
		$html = "<img src='$src' alt='$alt' />";
		return $html;
	}
}

/**
 * {@internal Missing Short Description}}
 *
 * @since 2.5.0
 *
 * @return unknown
 */
function media_upload_gallery() {
	$errors = array();

	if ( !empty($_POST) ) {
		$return = media_upload_form_handler();

		if ( is_string($return) )
			return $return;
		if ( is_array($return) )
			$errors = $return;
	}

	wp_enqueue_script('admin-gallery');
	return wp_iframe( 'media_upload_gallery_form', $errors );
}

/**
 * {@internal Missing Short Description}}
 *
 * @since 2.5.0
 *
 * @return unknown
 */
function media_upload_library() {
	$errors = array();
	if ( !empty($_POST) ) {
		$return = media_upload_form_handler();

		if ( is_string($return) )
			return $return;
		if ( is_array($return) )
			$errors = $return;
	}

	return wp_iframe( 'media_upload_library_form', $errors );
}

/**
 * Retrieve HTML for the image alignment radio buttons with the specified one checked.
 *
 * @since 2.7.0
 *
 * @param object $post
 * @param string $checked
 * @return string
 */
function image_align_input_fields( $post, $checked = '' ) {

	if ( empty($checked) )
		$checked = get_user_setting('align', 'none');

	$alignments = array('none' => __('None'), 'left' => __('Left'), 'center' => __('Center'), 'right' => __('Right'));
	if ( !array_key_exists( (string) $checked, $alignments ) )
		$checked = 'none';

	$out = array();
	foreach ( $alignments as $name => $label ) {
		$name = esc_attr($name);
		$out[] = "<input type='radio' name='attachments[{$post->ID}][align]' id='image-align-{$name}-{$post->ID}' value='$name'".
		 	( $checked == $name ? " checked='checked'" : "" ) .
			" /><label for='image-align-{$name}-{$post->ID}' class='align image-align-{$name}-label'>$label</label>";
	}
	return join("\n", $out);
}

/**
 * Retrieve HTML for the size radio buttons with the specified one checked.
 *
 * @since 2.7.0
 *
 * @param object $post
 * @param bool|string $check
 * @return array
 */
function image_size_input_fields( $post, $check = '' ) {

		// get a list of the actual pixel dimensions of each possible intermediate version of this image
		$size_names = apply_filters( 'image_size_names_choose', array('thumbnail' => __('Thumbnail'), 'medium' => __('Medium'), 'large' => __('Large'), 'full' => __('Full Size')) );

		if ( empty($check) )
			$check = get_user_setting('imgsize', 'medium');

		foreach ( $size_names as $size => $label ) {
			$downsize = image_downsize($post->ID, $size);
			$checked = '';

			// is this size selectable?
			$enabled = ( $downsize[3] || 'full' == $size );
			$css_id = "image-size-{$size}-{$post->ID}";
			// if this size is the default but that's not available, don't select it
			if ( $size == $check ) {
				if ( $enabled )
					$checked = " checked='checked'";
				else
					$check = '';
			} elseif ( !$check && $enabled && 'thumbnail' != $size ) {
				// if $check is not enabled, default to the first available size that's bigger than a thumbnail
				$check = $size;
				$checked = " checked='checked'";
			}

			$html = "<div class='image-size-item'><input type='radio' " . disabled( $enabled, false, false ) . "name='attachments[$post->ID][image-size]' id='{$css_id}' value='{$size}'$checked />";

			$html .= "<label for='{$css_id}'>$label</label>";
			// only show the dimensions if that choice is available
			if ( $enabled )
				$html .= " <label for='{$css_id}' class='help'>" . sprintf( "(%d&nbsp;&times;&nbsp;%d)", $downsize[1], $downsize[2] ). "</label>";

			$html .= '</div>';

			$out[] = $html;
		}

		return array(
			'label' => __('Size'),
			'input' => 'html',
			'html'  => join("\n", $out),
		);
}

/**
 * Retrieve HTML for the Link URL buttons with the default link type as specified.
 *
 * @since 2.7.0
 *
 * @param object $post
 * @param string $url_type
 * @return string
 */
function image_link_input_fields($post, $url_type = '') {

	$file = wp_get_attachment_url($post->ID);
	$link = get_attachment_link($post->ID);

	if ( empty($url_type) )
		$url_type = get_user_setting('urlbutton', 'post');

	$url = '';
	if ( $url_type == 'file' )
		$url = $file;
	elseif ( $url_type == 'post' )
		$url = $link;

	return "
	<input type='text' class='text urlfield' name='attachments[$post->ID][url]' value='" . esc_attr($url) . "' /><br />
	<button type='button' class='button urlnone' data-link-url=''>" . __('None') . "</button>
	<button type='button' class='button urlfile' data-link-url='" . esc_attr($file) . "'>" . __('File URL') . "</button>
	<button type='button' class='button urlpost' data-link-url='" . esc_attr($link) . "'>" . __('Attachment Post URL') . "</button>
";
}

function wp_caption_input_textarea($edit_post) {
	// post data is already escaped
	$name = "attachments[{$edit_post->ID}][post_excerpt]";

	return '<textarea name="' . $name . '" id="' . $name . '">' . $edit_post->post_excerpt . '</textarea>';
}

/**
 * {@internal Missing Short Description}}
 *
 * @since 2.5.0
 *
 * @param array $form_fields
 * @param object $post
 * @return array
 */
function image_attachment_fields_to_edit($form_fields, $post) {
	return $form_fields;
}

/**
 * {@internal Missing Short Description}}
 *
 * @since 2.5.0
 *
 * @param array $form_fields
 * @param object $post {@internal $post not used}}
 * @return array
 */
function media_single_attachment_fields_to_edit( $form_fields, $post ) {
	unset($form_fields['url'], $form_fields['align'], $form_fields['image-size']);
	return $form_fields;
}

/**
 * {@internal Missing Short Description}}
 *
 * @since 2.8.0
 *
 * @param array $form_fields
 * @param object $post {@internal $post not used}}
 * @return array
 */
function media_post_single_attachment_fields_to_edit( $form_fields, $post ) {
	unset($form_fields['image_url']);
	return $form_fields;
}

/**
 * Filters input from media_upload_form_handler() and assigns a default
 * post_title from the file name if none supplied.
 *
 * Illustrates the use of the attachment_fields_to_save filter
 * which can be used to add default values to any field before saving to DB.
 *
 * @since 2.5.0
 *
 * @param object $post
 * @param array $attachment {@internal $attachment not used}}
 * @return array
 */
function image_attachment_fields_to_save($post, $attachment) {
	if ( substr($post['post_mime_type'], 0, 5) == 'image' ) {
		if ( strlen(trim($post['post_title'])) == 0 ) {
			$post['post_title'] = preg_replace('/\.\w+$/', '', basename($post['guid']));
			$post['errors']['post_title']['errors'][] = __('Empty Title filled from filename.');
		}
	}

	return $post;
}

add_filter('attachment_fields_to_save', 'image_attachment_fields_to_save', 10, 2);

/**
 * {@internal Missing Short Description}}
 *
 * @since 2.5.0
 *
 * @param string $html
 * @param integer $attachment_id
 * @param array $attachment
 * @return array
 */
function image_media_send_to_editor($html, $attachment_id, $attachment) {
	$post = get_post($attachment_id);
	if ( substr($post->post_mime_type, 0, 5) == 'image' ) {
		$url = $attachment['url'];
		$align = !empty($attachment['align']) ? $attachment['align'] : 'none';
		$size = !empty($attachment['image-size']) ? $attachment['image-size'] : 'medium';
		$alt = !empty($attachment['image_alt']) ? $attachment['image_alt'] : '';
		$rel = ( $url == get_attachment_link($attachment_id) );

		return get_image_send_to_editor($attachment_id, $attachment['post_excerpt'], $attachment['post_title'], $align, $url, $rel, $size, $alt);
	}

	return $html;
}

add_filter('media_send_to_editor', 'image_media_send_to_editor', 10, 3);

/**
 * {@internal Missing Short Description}}
 *
 * @since 2.5.0
 *
 * @param object $post
 * @param array $errors
 * @return array
 */
function get_attachment_fields_to_edit($post, $errors = null) {
	if ( is_int($post) )
		$post = get_post($post);
	if ( is_array($post) )
		$post = new WP_Post( (object) $post );

	$image_url = wp_get_attachment_url($post->ID);

	$edit_post = sanitize_post($post, 'edit');

	$form_fields = array(
		'post_title'   => array(
			'label'      => __('Title'),
			'value'      => $edit_post->post_title
		),
		'image_alt'   => array(),
		'post_excerpt' => array(
			'label'      => __('Caption'),
			'input'      => 'html',
			'html'       => wp_caption_input_textarea($edit_post)
		),
		'post_content' => array(
			'label'      => __('Description'),
			'value'      => $edit_post->post_content,
			'input'      => 'textarea'
		),
		'url'          => array(
			'label'      => __('Link URL'),
			'input'      => 'html',
			'html'       => image_link_input_fields($post, get_option('image_default_link_type')),
			'helps'      => __('Enter a link URL or click above for presets.')
		),
		'menu_order'   => array(
			'label'      => __('Order'),
			'value'      => $edit_post->menu_order
		),
		'image_url'	=> array(
			'label'      => __('File URL'),
			'input'      => 'html',
			'html'       => "<input type='text' class='text urlfield' readonly='readonly' name='attachments[$post->ID][url]' value='" . esc_attr($image_url) . "' /><br />",
			'value'      => wp_get_attachment_url($post->ID),
			'helps'      => __('Location of the uploaded file.')
		)
	);

	foreach ( get_attachment_taxonomies($post) as $taxonomy ) {
		$t = (array) get_taxonomy($taxonomy);
		if ( ! $t['public'] || ! $t['show_ui'] )
			continue;
		if ( empty($t['label']) )
			$t['label'] = $taxonomy;
		if ( empty($t['args']) )
			$t['args'] = array();

		$terms = get_object_term_cache($post->ID, $taxonomy);
		if ( false === $terms )
			$terms = wp_get_object_terms($post->ID, $taxonomy, $t['args']);

		$values = array();

		foreach ( $terms as $term )
			$values[] = $term->slug;
		$t['value'] = join(', ', $values);

		$form_fields[$taxonomy] = $t;
	}

	// Merge default fields with their errors, so any key passed with the error (e.g. 'error', 'helps', 'value') will replace the default
	// The recursive merge is easily traversed with array casting: foreach( (array) $things as $thing )
	$form_fields = array_merge_recursive($form_fields, (array) $errors);

	// This was formerly in image_attachment_fields_to_edit().
	if ( substr($post->post_mime_type, 0, 5) == 'image' ) {
		$alt = get_post_meta($post->ID, '_wp_attachment_image_alt', true);
		if ( empty($alt) )
			$alt = '';

		$form_fields['post_title']['required'] = true;

		$form_fields['image_alt'] = array(
			'value' => $alt,
			'label' => __('Alternative Text'),
			'helps' => __('Alt text for the image, e.g. &#8220;The Mona Lisa&#8221;')
		);

		$form_fields['align'] = array(
			'label' => __('Alignment'),
			'input' => 'html',
			'html'  => image_align_input_fields($post, get_option('image_default_align')),
		);

		$form_fields['image-size'] = image_size_input_fields( $post, get_option('image_default_size', 'medium') );

	} else {
		unset( $form_fields['image_alt'] );
	}

	$form_fields = apply_filters('attachment_fields_to_edit', $form_fields, $post);

	return $form_fields;
}

/**
 * Retrieve HTML for media items of post gallery.
 *
 * The HTML markup retrieved will be created for the progress of SWF Upload
 * component. Will also create link for showing and hiding the form to modify
 * the image attachment.
 *
 * @since 2.5.0
 *
 * @param int $post_id Optional. Post ID.
 * @param array $errors Errors for attachment, if any.
 * @return string
 */
function get_media_items( $post_id, $errors ) {
	$attachments = array();
	if ( $post_id ) {
		$post = get_post($post_id);
		if ( $post && $post->post_type == 'attachment' )
			$attachments = array($post->ID => $post);
		else
			$attachments = get_children( array( 'post_parent' => $post_id, 'post_type' => 'attachment', 'orderby' => 'menu_order ASC, ID', 'order' => 'DESC') );
	} else {
		if ( is_array($GLOBALS['wp_the_query']->posts) )
			foreach ( $GLOBALS['wp_the_query']->posts as $attachment )
				$attachments[$attachment->ID] = $attachment;
	}

	$output = '';
	foreach ( (array) $attachments as $id => $attachment ) {
		if ( $attachment->post_status == 'trash' )
			continue;
		if ( $item = get_media_item( $id, array( 'errors' => isset($errors[$id]) ? $errors[$id] : null) ) )
			$output .= "\n<div id='media-item-$id' class='media-item child-of-$attachment->post_parent preloaded'><div class='progress hidden'><div class='bar'></div></div><div id='media-upload-error-$id' class='hidden'></div><div class='filename hidden'></div>$item\n</div>";
	}

	return $output;
}

/**
 * Retrieve HTML form for modifying the image attachment.
 *
 * @since 2.5.0
 *
 * @param int $attachment_id Attachment ID for modification.
 * @param string|array $args Optional. Override defaults.
 * @return string HTML form for attachment.
 */
function get_media_item( $attachment_id, $args = null ) {
	global $redir_tab;

	if ( ( $attachment_id = intval( $attachment_id ) ) && $thumb_url = wp_get_attachment_image_src( $attachment_id, 'thumbnail', true ) )
		$thumb_url = $thumb_url[0];
	else
		$thumb_url = false;

	$post = get_post( $attachment_id );
	$current_post_id = !empty( $_GET['post_id'] ) ? (int) $_GET['post_id'] : 0;

	$default_args = array( 'errors' => null, 'send' => $current_post_id ? post_type_supports( get_post_type( $current_post_id ), 'editor' ) : true, 'delete' => true, 'toggle' => true, 'show_title' => true );
	$args = wp_parse_args( $args, $default_args );
	$args = apply_filters( 'get_media_item_args', $args );
	extract( $args, EXTR_SKIP );

	$toggle_on  = __( 'Show' );
	$toggle_off = __( 'Hide' );

	$filename = esc_html( wp_basename( $post->guid ) );
	$title = esc_attr( $post->post_title );

	if ( $_tags = get_the_tags( $attachment_id ) ) {
		foreach ( $_tags as $tag )
			$tags[] = $tag->name;
		$tags = esc_attr( join( ', ', $tags ) );
	}

	$post_mime_types = get_post_mime_types();
	$keys = array_keys( wp_match_mime_types( array_keys( $post_mime_types ), $post->post_mime_type ) );
	$type = array_shift( $keys );
	$type_html = "<input type='hidden' id='type-of-$attachment_id' value='" . esc_attr( $type ) . "' />";

	$form_fields = get_attachment_fields_to_edit( $post, $errors );

	if ( $toggle ) {
		$class = empty( $errors ) ? 'startclosed' : 'startopen';
		$toggle_links = "
	<a class='toggle describe-toggle-on' href='#'>$toggle_on</a>
	<a class='toggle describe-toggle-off' href='#'>$toggle_off</a>";
	} else {
		$class = '';
		$toggle_links = '';
	}

	$display_title = ( !empty( $title ) ) ? $title : $filename; // $title shouldn't ever be empty, but just in case
	$display_title = $show_title ? "<div class='filename new'><span class='title'>" . wp_html_excerpt( $display_title, 60, '&hellip;' ) . "</span></div>" : '';

	$gallery = ( ( isset( $_REQUEST['tab'] ) && 'gallery' == $_REQUEST['tab'] ) || ( isset( $redir_tab ) && 'gallery' == $redir_tab ) );
	$order = '';

	foreach ( $form_fields as $key => $val ) {
		if ( 'menu_order' == $key ) {
			if ( $gallery )
				$order = "<div class='menu_order'> <input class='menu_order_input' type='text' id='attachments[$attachment_id][menu_order]' name='attachments[$attachment_id][menu_order]' value='" . esc_attr( $val['value'] ). "' /></div>";
			else
				$order = "<input type='hidden' name='attachments[$attachment_id][menu_order]' value='" . esc_attr( $val['value'] ) . "' />";

			unset( $form_fields['menu_order'] );
			break;
		}
	}

	$media_dims = '';
	$meta = wp_get_attachment_metadata( $post->ID );
	if ( isset( $meta['width'], $meta['height'] ) )
		$media_dims .= "<span id='media-dims-$post->ID'>{$meta['width']}&nbsp;&times;&nbsp;{$meta['height']}</span> ";
	$media_dims = apply_filters( 'media_meta', $media_dims, $post );

	$image_edit_button = '';
	if ( wp_attachment_is_image( $post->ID ) && wp_image_editor_supports( array( 'mime_type' => $post->post_mime_type ) ) ) {
		$nonce = wp_create_nonce( "image_editor-$post->ID" );
		$image_edit_button = "<input type='button' id='imgedit-open-btn-$post->ID' onclick='imageEdit.open( $post->ID, \"$nonce\" )' class='button' value='" . esc_attr__( 'Edit Image' ) . "' /> <span class='spinner'></span>";
	}

	$attachment_url = get_permalink( $attachment_id );

	$item = "
	$type_html
	$toggle_links
	$order
	$display_title
	<table class='slidetoggle describe $class'>
		<thead class='media-item-info' id='media-head-$post->ID'>
		<tr valign='top'>
			<td class='A1B1' id='thumbnail-head-$post->ID'>
			<p><a href='$attachment_url' target='_blank'><img class='thumbnail' src='$thumb_url' alt='' /></a></p>
			<p>$image_edit_button</p>
			</td>
			<td>
			<p><strong>" . __('File name:') . "</strong> $filename</p>
			<p><strong>" . __('File type:') . "</strong> $post->post_mime_type</p>
			<p><strong>" . __('Upload date:') . "</strong> " . mysql2date( get_option('date_format'), $post->post_date ). '</p>';
			if ( !empty( $media_dims ) )
				$item .= "<p><strong>" . __('Dimensions:') . "</strong> $media_dims</p>\n";

			$item .= "</td></tr>\n";

	$item .= "
		</thead>
		<tbody>
		<tr><td colspan='2' class='imgedit-response' id='imgedit-response-$post->ID'></td></tr>
		<tr><td style='display:none' colspan='2' class='image-editor' id='image-editor-$post->ID'></td></tr>\n";

	$defaults = array(
		'input'      => 'text',
		'required'   => false,
		'value'      => '',
		'extra_rows' => array(),
	);

	if ( $send )
		$send = get_submit_button( __( 'Insert into Post' ), 'button', "send[$attachment_id]", false );
	if ( $delete && current_user_can( 'delete_post', $attachment_id ) ) {
		if ( !EMPTY_TRASH_DAYS ) {
			$delete = "<a href='" . wp_nonce_url( "post.php?action=delete&amp;post=$attachment_id", 'delete-post_' . $attachment_id ) . "' id='del[$attachment_id]' class='delete-permanently'>" . __( 'Delete Permanently' ) . '</a>';
		} elseif ( !MEDIA_TRASH ) {
			$delete = "<a href='#' class='del-link' onclick=\"document.getElementById('del_attachment_$attachment_id').style.display='block';return false;\">" . __( 'Delete' ) . "</a>
			 <div id='del_attachment_$attachment_id' class='del-attachment' style='display:none;'><p>" . sprintf( __( 'You are about to delete <strong>%s</strong>.' ), $filename ) . "</p>
			 <a href='" . wp_nonce_url( "post.php?action=delete&amp;post=$attachment_id", 'delete-post_' . $attachment_id ) . "' id='del[$attachment_id]' class='button'>" . __( 'Continue' ) . "</a>
			 <a href='#' class='button' onclick=\"this.parentNode.style.display='none';return false;\">" . __( 'Cancel' ) . "</a>
			 </div>";
		} else {
			$delete = "<a href='" . wp_nonce_url( "post.php?action=trash&amp;post=$attachment_id", 'trash-post_' . $attachment_id ) . "' id='del[$attachment_id]' class='delete'>" . __( 'Move to Trash' ) . "</a>
			<a href='" . wp_nonce_url( "post.php?action=untrash&amp;post=$attachment_id", 'untrash-post_' . $attachment_id ) . "' id='undo[$attachment_id]' class='undo hidden'>" . __( 'Undo' ) . "</a>";
		}
	} else {
		$delete = '';
	}

	$thumbnail = '';
	$calling_post_id = 0;
	if ( isset( $_GET['post_id'] ) )
		$calling_post_id = absint( $_GET['post_id'] );
	elseif ( isset( $_POST ) && count( $_POST ) ) // Like for async-upload where $_GET['post_id'] isn't set
		$calling_post_id = $post->post_parent;
	if ( 'image' == $type && $calling_post_id && current_theme_supports( 'post-thumbnails', get_post_type( $calling_post_id ) )
		&& post_type_supports( get_post_type( $calling_post_id ), 'thumbnail' ) && get_post_thumbnail_id( $calling_post_id ) != $attachment_id ) {
		$ajax_nonce = wp_create_nonce( "set_post_thumbnail-$calling_post_id" );
		$thumbnail = "<a class='wp-post-thumbnail' id='wp-post-thumbnail-" . $attachment_id . "' href='#' onclick='WPSetAsThumbnail(\"$attachment_id\", \"$ajax_nonce\");return false;'>" . esc_html__( "Use as featured image" ) . "</a>";
	}

	if ( ( $send || $thumbnail || $delete ) && !isset( $form_fields['buttons'] ) )
		$form_fields['buttons'] = array( 'tr' => "\t\t<tr class='submit'><td></td><td class='savesend'>$send $thumbnail $delete</td></tr>\n" );

	$hidden_fields = array();

	foreach ( $form_fields as $id => $field ) {
		if ( $id[0] == '_' )
			continue;

		if ( !empty( $field['tr'] ) ) {
			$item .= $field['tr'];
			continue;
		}

		$field = array_merge( $defaults, $field );
		$name = "attachments[$attachment_id][$id]";

		if ( $field['input'] == 'hidden' ) {
			$hidden_fields[$name] = $field['value'];
			continue;
		}

		$required      = $field['required'] ? '<span class="alignright"><abbr title="required" class="required">*</abbr></span>' : '';
		$aria_required = $field['required'] ? " aria-required='true' " : '';
		$class  = $id;
		$class .= $field['required'] ? ' form-required' : '';

		$item .= "\t\t<tr class='$class'>\n\t\t\t<th valign='top' scope='row' class='label'><label for='$name'><span class='alignleft'>{$field['label']}</span>$required<br class='clear' /></label></th>\n\t\t\t<td class='field'>";
		if ( !empty( $field[ $field['input'] ] ) )
			$item .= $field[ $field['input'] ];
		elseif ( $field['input'] == 'textarea' ) {
			if ( 'post_content' == $id && user_can_richedit() ) {
				// sanitize_post() skips the post_content when user_can_richedit
				$field['value'] = htmlspecialchars( $field['value'], ENT_QUOTES );
			}
			// post_excerpt is already escaped by sanitize_post() in get_attachment_fields_to_edit()
			$item .= "<textarea id='$name' name='$name' $aria_required>" . $field['value'] . '</textarea>';
		} else {
			$item .= "<input type='text' class='text' id='$name' name='$name' value='" . esc_attr( $field['value'] ) . "' $aria_required />";
		}
		if ( !empty( $field['helps'] ) )
			$item .= "<p class='help'>" . join( "</p>\n<p class='help'>", array_unique( (array) $field['helps'] ) ) . '</p>';
		$item .= "</td>\n\t\t</tr>\n";

		$extra_rows = array();

		if ( !empty( $field['errors'] ) )
			foreach ( array_unique( (array) $field['errors'] ) as $error )
				$extra_rows['error'][] = $error;

		if ( !empty( $field['extra_rows'] ) )
			foreach ( $field['extra_rows'] as $class => $rows )
				foreach ( (array) $rows as $html )
					$extra_rows[$class][] = $html;

		foreach ( $extra_rows as $class => $rows )
			foreach ( $rows as $html )
				$item .= "\t\t<tr><td></td><td class='$class'>$html</td></tr>\n";
	}

	if ( !empty( $form_fields['_final'] ) )
		$item .= "\t\t<tr class='final'><td colspan='2'>{$form_fields['_final']}</td></tr>\n";
	$item .= "\t</tbody>\n";
	$item .= "\t</table>\n";

	foreach ( $hidden_fields as $name => $value )
		$item .= "\t<input type='hidden' name='$name' id='$name' value='" . esc_attr( $value ) . "' />\n";

	if ( $post->post_parent < 1 && isset( $_REQUEST['post_id'] ) ) {
		$parent = (int) $_REQUEST['post_id'];
		$parent_name = "attachments[$attachment_id][post_parent]";
		$item .= "\t<input type='hidden' name='$parent_name' id='$parent_name' value='$parent' />\n";
	}

	return $item;
}

function get_compat_media_markup( $attachment_id, $args = null ) {
	$post = get_post( $attachment_id );

	$default_args = array(
		'errors' => null,
		'in_modal' => false,
	);

	$user_can_edit = current_user_can( 'edit_post', $attachment_id );

	$args = wp_parse_args( $args, $default_args );
	$args = apply_filters( 'get_media_item_args', $args );

	$form_fields = array();

	if ( $args['in_modal'] ) {
		foreach ( get_attachment_taxonomies($post) as $taxonomy ) {
			$t = (array) get_taxonomy($taxonomy);
			if ( ! $t['public'] || ! $t['show_ui'] )
				continue;
			if ( empty($t['label']) )
				$t['label'] = $taxonomy;
			if ( empty($t['args']) )
				$t['args'] = array();

			$terms = get_object_term_cache($post->ID, $taxonomy);
			if ( false === $terms )
				$terms = wp_get_object_terms($post->ID, $taxonomy, $t['args']);

			$values = array();

			foreach ( $terms as $term )
				$values[] = $term->slug;
			$t['value'] = join(', ', $values);
			$t['taxonomy'] = true;

			$form_fields[$taxonomy] = $t;
		}
	}

	// Merge default fields with their errors, so any key passed with the error (e.g. 'error', 'helps', 'value') will replace the default
	// The recursive merge is easily traversed with array casting: foreach( (array) $things as $thing )
	$form_fields = array_merge_recursive($form_fields, (array) $args['errors'] );

	$form_fields = apply_filters( 'attachment_fields_to_edit', $form_fields, $post );

	unset( $form_fields['image-size'], $form_fields['align'], $form_fields['image_alt'],
		$form_fields['post_title'], $form_fields['post_excerpt'], $form_fields['post_content'],
		$form_fields['url'], $form_fields['menu_order'], $form_fields['image_url'] );

	$media_meta = apply_filters( 'media_meta', '', $post );

	$defaults = array(
		'input'         => 'text',
 		'required'      => false,
 		'value'         => '',
 		'extra_rows'    => array(),
 		'show_in_edit'  => true,
 		'show_in_modal' => true,
	);

	$hidden_fields = array();

	$item = '';
	foreach ( $form_fields as $id => $field ) {
		if ( $id[0] == '_' )
			continue;

		$name = "attachments[$attachment_id][$id]";
		$id_attr = "attachments-$attachment_id-$id";

		if ( !empty( $field['tr'] ) ) {
			$item .= $field['tr'];
			continue;
		}

		$field = array_merge( $defaults, $field );

		if ( ( ! $field['show_in_edit'] && ! $args['in_modal'] ) || ( ! $field['show_in_modal'] && $args['in_modal'] ) )
			continue;

		if ( $field['input'] == 'hidden' ) {
			$hidden_fields[$name] = $field['value'];
			continue;
		}

		$readonly      = ! $user_can_edit && ! empty( $field['taxonomy'] ) ? " readonly='readonly' " : '';
		$required      = $field['required'] ? '<span class="alignright"><abbr title="required" class="required">*</abbr></span>' : '';
		$aria_required = $field['required'] ? " aria-required='true' " : '';
		$class  = 'compat-field-' . $id;
		$class .= $field['required'] ? ' form-required' : '';

		$item .= "\t\t<tr class='$class'>";
		$item .= "\t\t\t<th valign='top' scope='row' class='label'><label for='$id_attr'><span class='alignleft'>{$field['label']}</span>$required<br class='clear' /></label>";
		$item .= "</th>\n\t\t\t<td class='field'>";

		if ( !empty( $field[ $field['input'] ] ) )
			$item .= $field[ $field['input'] ];
		elseif ( $field['input'] == 'textarea' ) {
			if ( 'post_content' == $id && user_can_richedit() ) {
				// sanitize_post() skips the post_content when user_can_richedit
				$field['value'] = htmlspecialchars( $field['value'], ENT_QUOTES );
			}
			$item .= "<textarea id='$id_attr' name='$name' $aria_required>" . $field['value'] . '</textarea>';
		} else {
			$item .= "<input type='text' class='text' id='$id_attr' name='$name' value='" . esc_attr( $field['value'] ) . "' $readonly $aria_required />";
		}
		if ( !empty( $field['helps'] ) )
			$item .= "<p class='help'>" . join( "</p>\n<p class='help'>", array_unique( (array) $field['helps'] ) ) . '</p>';
		$item .= "</td>\n\t\t</tr>\n";

		$extra_rows = array();

		if ( !empty( $field['errors'] ) )
			foreach ( array_unique( (array) $field['errors'] ) as $error )
				$extra_rows['error'][] = $error;

		if ( !empty( $field['extra_rows'] ) )
			foreach ( $field['extra_rows'] as $class => $rows )
				foreach ( (array) $rows as $html )
					$extra_rows[$class][] = $html;

		foreach ( $extra_rows as $class => $rows )
			foreach ( $rows as $html )
				$item .= "\t\t<tr><td></td><td class='$class'>$html</td></tr>\n";
	}

	if ( !empty( $form_fields['_final'] ) )
		$item .= "\t\t<tr class='final'><td colspan='2'>{$form_fields['_final']}</td></tr>\n";
	if ( $item )
		$item = '<table class="compat-attachment-fields">' . $item . '</table>';

	foreach ( $hidden_fields as $hidden_field => $value ) {
		$item .= '<input type="hidden" name="' . esc_attr( $hidden_field ) . '" value="' . esc_attr( $value ) . '" />' . "\n";
	}

	if ( $item )
		$item = '<input type="hidden" name="attachments[' . $attachment_id . '][menu_order]" value="' . esc_attr( $post->menu_order ) . '" />' . $item;

	return array(
		'item'   => $item,
		'meta'   => $media_meta,
	);
}

/**
 * {@internal Missing Short Description}}
 *
 * @since 2.5.0
 */
function media_upload_header() {
	$post_id = isset( $_REQUEST['post_id'] ) ? intval( $_REQUEST['post_id'] ) : 0;
	echo '<script type="text/javascript">post_id = ' . $post_id . ";</script>\n";
	if ( empty( $_GET['chromeless'] ) ) {
		echo '<div id="media-upload-header">';
		the_media_upload_tabs();
		echo '</div>';
	}
}

/**
 * {@internal Missing Short Description}}
 *
 * @since 2.5.0
 *
 * @param unknown_type $errors
 */
function media_upload_form( $errors = null ) {
	global $type, $tab, $pagenow, $is_IE, $is_opera;

	if ( ! _device_can_upload() ) {
		echo '<p>' . sprintf( __('The web browser on your device cannot be used to upload files. You may be able to use the <a href="%s">native app for your device</a> instead.'), 'http://wordpress.org/mobile/' ) . '</p>';
		return;
	}

	$upload_action_url = admin_url('async-upload.php');
	$post_id = isset($_REQUEST['post_id']) ? intval($_REQUEST['post_id']) : 0;
	$_type = isset($type) ? $type : '';
	$_tab = isset($tab) ? $tab : '';

	$upload_size_unit = $max_upload_size = wp_max_upload_size();
	$sizes = array( 'KB', 'MB', 'GB' );

	for ( $u = -1; $upload_si