读懂每一行代码! 问题大全new
你需要登录才能添加代码说明
wordpress-4.0/ wp-admin/ upload.php
 1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32  33  34  35  36  37  38  39  40  41  42  43  44  45  46  47  48  49  50  51  52  53  54  55  56  57  58  59  60  61  62  63  64  65  66  67  68  69  70  71  72  73  74  75  76  77  78  79  80  81  82  83  84  85  86  87  88  89  90  91  92  93  94  95  96  97  98  99  100  101  102  103  104  105  106  107  108  109  110  111  112  113  114  115  116  117  118  119  120  121  122  123  124  125  126  127  128  129  130  131  132  133  134  135  136  137  138  139  140  141  142  143  144  145  146  147  148  149  150  151  152  153  154  155  156  157  158  159  160  161  162  163  164  165  166  167  168  169  170  171  172  173  174  175  176  177  178  179  180  181  182  183  184  185  186  187  188  189  190  191  192  193  194  195  196  197  198  199  200  201  202  203  204  205  206  207  208  209  210  211  212  213  214  215  216  217  218  219  220  221  222  223  224  225  226  227  228  229  230  231  232  233  234  235  236  237  238  239  240  241  242  243  244  245  246  247  248  249  250  251  252  253  254  255  256  257  258  259  260  261  262  263  264  265  266  267  268  269  270  271  272  273  274  275  276  277  278  279  280  281  282  283  284  285  286  287  288  289  290  291  292  293 
<?php
/**
 * Media Library administration panel.
 *
 * @package WordPress
 * @subpackage Administration
 */

/** WordPress Administration Bootstrap */
require_once( dirname( __FILE__ ) . '/admin.php' );

if ( !current_user_can('upload_files') )
	wp_die( __( 'You do not have permission to upload files.' ) );

$mode = get_user_option( 'media_library_mode', get_current_user_id() ) ? get_user_option( 'media_library_mode', get_current_user_id() ) : 'grid';
$modes = array( 'grid', 'list' );

if ( isset( $_GET['mode'] ) && in_array( $_GET['mode'], $modes ) ) {
	$mode = $_GET['mode'];
	update_user_option( get_current_user_id(), 'media_library_mode', $mode );
}

if ( 'grid' === $mode ) {
	wp_enqueue_media();
	wp_enqueue_script( 'media-grid' );
	wp_enqueue_script( 'media' );
	wp_localize_script( 'media-grid', '_wpMediaGridSettings', array(
		'adminUrl' => parse_url( self_admin_url(), PHP_URL_PATH ),
	) );

	get_current_screen()->add_help_tab( array(
		'id'		=> 'overview',
		'title'		=> __( 'Overview' ),
		'content'	=>
			'<p>' . __( 'All the files you&#8217;ve uploaded are listed in the Media Library, with the most recent uploads listed first.' ) . '</p>' .
			'<p>' . __( 'You can view your media in a simple visual grid or a list with columns. Switch between these views using the icons to the left above the media.' ) . '</p>' .
			'<p>' . __( 'To delete media items, click the Bulk Select button at the top of the screen. Select any items you wish to delete, then click the Delete Selected button. Clicking the Cancel Selection button takes you back to viewing your media.' ) . '</p>'
	) );

	get_current_screen()->add_help_tab( array(
		'id'		=> 'attachment-details',
		'title'		=> __( 'Attachment Details' ),
		'content'	=>
			'<p>' . __( 'Clicking an item will display an Attachment Details dialog, which allows you to preview media and make quick edits. Any changes you make to the attachment details will be automatically saved.' ) . '</p>' .
			'<p>' . __( 'Use the arrow buttons at the top of the dialog, or the left and right arrow keys on your keyboard, to navigate between media items quickly.' ) . '</p>' .
			'<p>' . __( 'You can also delete individual items and access the extended edit screen from the details dialog.' ) . '</p>'
	) );

	get_current_screen()->set_help_sidebar(
		'<p><strong>' . __( 'For more information:' ) . '</strong></p>' .
		'<p>' . __( '<a href="http://codex.wordpress.org/Media_Library_Screen" target="_blank">Documentation on Media Library</a>' ) . '</p>' .
		'<p>' . __( '<a href="https://wordpress.org/support/" target="_blank">Support Forums</a>' ) . '</p>'
	);

	$title = __('Media Library');
	$parent_file = 'upload.php';

	require_once( ABSPATH . 'wp-admin/admin-header.php' );
	?>
	<div class="wrap">
		<h2>
		<?php
		echo esc_html( $title );
		if ( current_user_can( 'upload_files' ) ) { ?>
			<a href="media-new.php" class="add-new-h2"><?php echo esc_html_x( 'Add New', 'file' ); ?></a><?php
		}
		?>
		</h2>
		<div class="error hide-if-js">
			<p><?php _e( 'The grid view for the Media Library requires JavaScript. <a href="upload.php?mode=list">Switch to the list view</a>.' ); ?></p>
		</div>
	</div>
	<?php
	include( ABSPATH . 'wp-admin/admin-footer.php' );
	exit;
}

$wp_list_table = _get_list_table('WP_Media_List_Table');
$pagenum = $wp_list_table->get_pagenum();

// Handle bulk actions
$doaction = $wp_list_table->current_action();

if ( $doaction ) {
	check_admin_referer('bulk-media');

	if ( 'delete_all' == $doaction ) {
		$post_ids = $wpdb->get_col( "SELECT ID FROM $wpdb->posts WHERE post_type='attachment' AND post_status = 'trash'" );
		$doaction = 'delete';
	} elseif ( isset( $_REQUEST['media'] ) ) {
		$post_ids = $_REQUEST['media'];
	} elseif ( isset( $_REQUEST['ids'] ) ) {
		$post_ids = explode( ',', $_REQUEST['ids'] );
	}

	$location = 'upload.php';
	if ( $referer = wp_get_referer() ) {
		if ( false !== strpos( $referer, 'upload.php' ) )
			$location = remove_query_arg( array( 'trashed', 'untrashed', 'deleted', 'message', 'ids', 'posted' ), $referer );
	}

	switch ( $doaction ) {
		case 'attach':
			$parent_id = (int) $_REQUEST['found_post_id'];
			if ( !$parent_id )
				return;

			$parent = get_post( $parent_id );
			if ( !current_user_can( 'edit_post', $parent_id ) )
				wp_die( __( 'You are not allowed to edit this post.' ) );

			$attach = array();
			foreach ( (array) $_REQUEST['media'] as $att_id ) {
				$att_id = (int) $att_id;

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

				$attach[] = $att_id;
			}

			if ( ! empty( $attach ) ) {
				$attach_string = implode( ',', $attach );
				$attached = $wpdb->query( $wpdb->prepare( "UPDATE $wpdb->posts SET post_parent = %d WHERE post_type = 'attachment' AND ID IN ( $attach_string )", $parent_id ) );
				foreach ( $attach as $att_id ) {
					clean_attachment_cache( $att_id );
				}
			}

			if ( isset( $attached ) ) {
				$location = 'upload.php';
				if ( $referer = wp_get_referer() ) {
					if ( false !== strpos( $referer, 'upload.php' ) )
						$location = $referer;
				}

				$location = add_query_arg( array( 'attached' => $attached ) , $location );
				wp_redirect( $location );
				exit;
			}
			break;
		case 'trash':
			if ( !isset( $post_ids ) )
				break;
			foreach ( (array) $post_ids as $post_id ) {
				if ( !current_user_can( 'delete_post', $post_id ) )
					wp_die( __( 'You are not allowed to move this post to the trash.' ) );

				if ( !wp_trash_post( $post_id ) )
					wp_die( __( 'Error in moving to trash.' ) );
			}
			$location = add_query_arg( array( 'trashed' => count( $post_ids ), 'ids' => join( ',', $post_ids ) ), $location );
			break;
		case 'untrash':
			if ( !isset( $post_ids ) )
				break;
			foreach ( (array) $post_ids as $post_id ) {
				if ( !current_user_can( 'delete_post', $post_id ) )
					wp_die( __( 'You are not allowed to move this post out of the trash.' ) );

				if ( !wp_untrash_post( $post_id ) )
					wp_die( __( 'Error in restoring from trash.' ) );
			}
			$location = add_query_arg( 'untrashed', count( $post_ids ), $location );
			break;
		case 'delete':
			if ( !isset( $post_ids ) )
				break;
			foreach ( (array) $post_ids as $post_id_del ) {
				if ( !current_user_can( 'delete_post', $post_id_del ) )
					wp_die( __( 'You are not allowed to delete this post.' ) );

				if ( !wp_delete_attachment( $post_id_del ) )
					wp_die( __( 'Error in deleting.' ) );
			}
			$location = add_query_arg( 'deleted', count( $post_ids ), $location );
			break;
	}

	wp_redirect( $location );
	exit;
} elseif ( ! empty( $_GET['_wp_http_referer'] ) ) {
	 wp_redirect( remove_query_arg( array( '_wp_http_referer', '_wpnonce' ), wp_unslash( $_SERVER['REQUEST_URI'] ) ) );
	 exit;
}

$wp_list_table->prepare_items();

$title = __('Media Library');
$parent_file = 'upload.php';

wp_enqueue_script( 'media' );

add_screen_option( 'per_page', array('label' => _x( 'Media items', 'items per page (screen options)' )) );

get_current_screen()->add_help_tab( array(
'id'		=> 'overview',
'title'		=> __('Overview'),
'content'	=>
	'<p>' . __( 'All the files you&#8217;ve uploaded are listed in the Media Library, with the most recent uploads listed first. You can use the Screen Options tab to customize the display of this screen.' ) . '</p>' .
	'<p>' . __( 'You can narrow the list by file type/status using the text link filters at the top of the screen. You also can refine the list by date using the dropdown menu above the media table.' ) . '</p>' .
	'<p>' . __( 'You can view your media in a simple visual grid or a list with columns. Switch between these views using the icons to the left above the media.' ) . '</p>'
) );
get_current_screen()->add_help_tab( array(
'id'		=> 'actions-links',
'title'		=> __('Available Actions'),
'content'	=>
	'<p>' . __( 'Hovering over a row reveals action links: Edit, Delete Permanently, and View. Clicking Edit or on the media file&#8217;s name displays a simple screen to edit that individual file&#8217;s metadata. Clicking Delete Permanently will delete the file from the media library (as well as from any posts to which it is currently attached). View will take you to the display page for that file.' ) . '</p>'
) );
get_current_screen()->add_help_tab( array(
'id'		=> 'attaching-files',
'title'		=> __('Attaching Files'),
'content'	=>
	'<p>' . __( 'If a media file has not been attached to any post, you will see that in the Attached To column, and can click on Attach File to launch a small popup that will allow you to search for a post and attach the file.' ) . '</p>'
) );

get_current_screen()->set_help_sidebar(
	'<p><strong>' . __( 'For more information:' ) . '</strong></p>' .
	'<p>' . __( '<a href="http://codex.wordpress.org/Media_Library_Screen" target="_blank">Documentation on Media Library</a>' ) . '</p>' .
	'<p>' . __( '<a href="https://wordpress.org/support/" target="_blank">Support Forums</a>' ) . '</p>'
);

require_once( ABSPATH . 'wp-admin/admin-header.php' );
?>

<div class="wrap">
<h2>
<?php
echo esc_html( $title );
if ( current_user_can( 'upload_files' ) ) { ?>
	<a href="media-new.php" class="add-new-h2"><?php echo esc_html_x('Add New', 'file'); ?></a><?php
}
if ( ! empty( $_REQUEST['s'] ) )
	printf( '<span class="subtitle">' . __('Search results for &#8220;%s&#8221;') . '</span>', get_search_query() ); ?>
</h2>

<?php
$message = '';
if ( ! empty( $_GET['posted'] ) ) {
	$message = __('Media attachment updated.');
	$_SERVER['REQUEST_URI'] = remove_query_arg(array('posted'), $_SERVER['REQUEST_URI']);
}

if ( ! empty( $_GET['attached'] ) && $attached = absint( $_GET['attached'] ) ) {
	$message = sprintf( _n('Reattached %d attachment.', 'Reattached %d attachments.', $attached), $attached );
	$_SERVER['REQUEST_URI'] = remove_query_arg(array('attached'), $_SERVER['REQUEST_URI']);
}

if ( ! empty( $_GET['deleted'] ) && $deleted = absint( $_GET['deleted'] ) ) {
	$message = sprintf( _n( 'Media attachment permanently deleted.', '%d media attachments permanently deleted.', $deleted ), number_format_i18n( $_GET['deleted'] ) );
	$_SERVER['REQUEST_URI'] = remove_query_arg(array('deleted'), $_SERVER['REQUEST_URI']);
}

if ( ! empty( $_GET['trashed'] ) && $trashed = absint( $_GET['trashed'] ) ) {
	$message = sprintf( _n( 'Media attachment moved to the trash.', '%d media attachments moved to the trash.', $trashed ), number_format_i18n( $_GET['trashed'] ) );
	$message .= ' <a href="' . esc_url( wp_nonce_url( 'upload.php?doaction=undo&action=untrash&ids='.(isset($_GET['ids']) ? $_GET['ids'] : ''), "bulk-media" ) ) . '">' . __('Undo') . '</a>';
	$_SERVER['REQUEST_URI'] = remove_query_arg(array('trashed'), $_SERVER['REQUEST_URI']);
}

if ( ! empty( $_GET['untrashed'] ) && $untrashed = absint( $_GET['untrashed'] ) ) {
	$message = sprintf( _n( 'Media attachment restored from the trash.', '%d media attachments restored from the trash.', $untrashed ), number_format_i18n( $_GET['untrashed'] ) );
	$_SERVER['REQUEST_URI'] = remove_query_arg(array('untrashed'), $_SERVER['REQUEST_URI']);
}

$messages[1] = __('Media attachment updated.');
$messages[2] = __('Media permanently deleted.');
$messages[3] = __('Error saving media attachment.');
$messages[4] = __('Media moved to the trash.') . ' <a href="' . esc_url( wp_nonce_url( 'upload.php?doaction=undo&action=untrash&ids='.(isset($_GET['ids']) ? $_GET['ids'] : ''), "bulk-media" ) ) . '">' . __('Undo') . '</a>';
$messages[5] = __('Media restored from the trash.');

if ( ! empty( $_GET['message'] ) && isset( $messages[ $_GET['message'] ] ) ) {
	$message = $messages[ $_GET['message'] ];
	$_SERVER['REQUEST_URI'] = remove_query_arg(array('message'), $_SERVER['REQUEST_URI']);
}

if ( !empty($message) ) { ?>
<div id="message" class="updated"><p><?php echo $message; ?></p></div>
<?php } ?>

<form id="posts-filter" action="" method="get">

<?php $wp_list_table->views(); ?>

<?php $wp_list_table->display(); ?>

<div id="ajax-response"></div>
<?php find_posts_div(); ?>
</form>
</div>

<?php
include( ABSPATH . 'wp-admin/admin-footer.php' );