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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.
| Line | Code |
|---|---|
| 2995 | * @return int How many rows were updated. |
| 2996 | */ |
| 2997 | function add_ping($post_id, $uri) { |
| 2998 | global $wpdb; |
| 2999 | $pung = $wpdb->get_var( $wpdb->prepare( "SELECT pinged FROM $wpdb->posts WHERE ID = %d", $post_id )); |
| 3000 | $pung = trim($pung); |
| 3001 | $pung = preg_split('/\s/', $pung); |
| 3002 | $pung[] = $uri; |
| 3003 | $new = implode("\n", $pung); |
| 3004 | $new = apply_filters('add_ping', $new); |
| 3005 | // expected_slashed ($new) |
| 3006 | $new = stripslashes($new); |
| 3007 | return $wpdb->update( $wpdb->posts, array( 'pinged' => $new ), array( 'ID' => $post_id ) ); |
| 3008 | } |
| 3009 | |
| 3010 | /** |
| 3011 | * Retrieve enclosures already enclosed for a post. |
| 3012 | * |
| 3013 | * @since 1.5.0 |