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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
This hook occurs 2 times in this file.
| Line | Code |
|---|---|
| 140 | _wp_ajax_menu_quick_search( $_REQUEST ); |
| 141 | |
| 142 | exit; |
| 143 | break; |
| 144 | case 'oembed-cache' : |
| 145 | $return = ( $wp_embed->cache_oembed( $_GET['post'] ) ) ? '1' : '0'; |
| 146 | die( $return ); |
| 147 | break; |
| 148 | default : |
| 149 | do_action( 'wp_ajax_' . $_GET['action'] ); |
| 150 | die('0'); |
| 151 | break; |
| 152 | endswitch; |
| 153 | endif; |
| 154 | |
| 155 | /** |
| 156 | * Sends back current comment total and new page links if they need to be updated. |
| 157 | * |
| 158 | * Contrary to normal success AJAX response ("1"), die with time() on success. |
| Line | Code |
| 1522 | $thumbnail_html = wp_get_attachment_image( $thumbnail_id, 'thumbnail' ); |
| 1523 | if ( !empty( $thumbnail_html ) ) { |
| 1524 | update_post_meta( $post_ID, '_thumbnail_id', $thumbnail_id ); |
| 1525 | die( _wp_post_thumbnail_html( $thumbnail_id ) ); |
| 1526 | } |
| 1527 | } |
| 1528 | die( '0' ); |
| 1529 | break; |
| 1530 | default : |
| 1531 | do_action( 'wp_ajax_' . $_POST['action'] ); |
| 1532 | die('0'); |
| 1533 | break; |
| 1534 | endswitch; |
| 1535 | ?> |
| 1536 | |