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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 |
|---|---|
| 681 | if ( $metakeyinput) |
| 682 | $metakey = $metakeyinput; // default |
| 683 | |
| 684 | if ( is_protected_meta( $metakey ) ) |
| 685 | return false; |
| 686 | |
| 687 | wp_cache_delete($post_ID, 'post_meta'); |
| 688 | $wpdb->insert( $wpdb->postmeta, array( 'post_id' => $post_ID, 'meta_key' => $metakey, 'meta_value' => $metavalue ) ); |
| 689 | $meta_id = $wpdb->insert_id; |
| 690 | do_action( 'added_postmeta', $meta_id, $post_ID, $metakey, $metavalue ); |
| 691 | |
| 692 | return $meta_id; |
| 693 | } |
| 694 | return false; |
| 695 | } // add_meta |
| 696 | |
| 697 | /** |
| 698 | * {@internal Missing Short Description}} |
| 699 | * |