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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 |
|---|---|
| 621 | |
| 622 | if ( $metakeyinput) |
| 623 | $metakey = $metakeyinput; // default |
| 624 | |
| 625 | if ( in_array($metakey, $protected) ) |
| 626 | return false; |
| 627 | |
| 628 | wp_cache_delete($post_ID, 'post_meta'); |
| 629 | $wpdb->insert( $wpdb->postmeta, array( 'post_id' => $post_ID, 'meta_key' => $metakey, 'meta_value' => $metavalue ) ); |
| 630 | do_action( 'added_postmeta', $wpdb->insert_id, $post_ID, $metakey, $metavalue ); |
| 631 | |
| 632 | return $wpdb->insert_id; |
| 633 | } |
| 634 | return false; |
| 635 | } // add_meta |
| 636 | |
| 637 | /** |
| 638 | * {@internal Missing Short Description}} |
| 639 | * |