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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 |
|---|---|
| 125 | die('-1'); |
| 126 | |
| 127 | die(); |
| 128 | break; |
| 129 | case 'oembed-cache' : |
| 130 | $return = ( $wp_embed->cache_oembed( $_GET['post'] ) ) ? '1' : '0'; |
| 131 | die( $return ); |
| 132 | break; |
| 133 | default : |
| 134 | do_action( 'wp_ajax_' . $_GET['action'] ); |
| 135 | die('0'); |
| 136 | break; |
| 137 | endswitch; |
| 138 | endif; |
| 139 | |
| 140 | /** |
| 141 | * Sends back current comment total and new page links if they need to be updated. |
| 142 | * |
| 143 | * Contrary to normal success AJAX response ("1"), die with time() on success. |
| Line | Code |
| 1419 | if ( $thumbnail_id && get_post( $thumbnail_id ) ) { |
| 1420 | $thumbnail_html = wp_get_attachment_image( $thumbnail_id, 'thumbnail' ); |
| 1421 | if ( !empty( $thumbnail_html ) ) { |
| 1422 | update_post_meta( $post_id, '_thumbnail_id', $thumbnail_id ); |
| 1423 | die( _wp_post_thumbnail_html( $thumbnail_id ) ); |
| 1424 | } |
| 1425 | } |
| 1426 | die( '0' ); |
| 1427 | default : |
| 1428 | do_action( 'wp_ajax_' . $_POST['action'] ); |
| 1429 | die('0'); |
| 1430 | break; |
| 1431 | endswitch; |
| 1432 | ?> |
| 1433 | |