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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 |
|---|---|
| 3278 | * @return int How many rows were updated. |
| 3279 | */ |
| 3280 | function add_ping($post_id, $uri) { |
| 3281 | global $wpdb; |
| 3282 | $pung = $wpdb->get_var( $wpdb->prepare( "SELECT pinged FROM $wpdb->posts WHERE ID = %d", $post_id )); |
| 3283 | $pung = trim($pung); |
| 3284 | $pung = preg_split('/\s/', $pung); |
| 3285 | $pung[] = $uri; |
| 3286 | $new = implode("\n", $pung); |
| 3287 | $new = apply_filters('add_ping', $new); |
| 3288 | // expected_slashed ($new) |
| 3289 | $new = stripslashes($new); |
| 3290 | return $wpdb->update( $wpdb->posts, array( 'pinged' => $new ), array( 'ID' => $post_id ) ); |
| 3291 | } |
| 3292 | |
| 3293 | /** |
| 3294 | * Retrieve enclosures already enclosed for a post. |
| 3295 | * |
| 3296 | * @since 1.5.0 |