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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 |
|---|---|
| 650 | if ( $metakeyinput) |
| 651 | $metakey = $metakeyinput; // default |
| 652 | |
| 653 | if ( in_array($metakey, $protected) ) |
| 654 | return false; |
| 655 | |
| 656 | wp_cache_delete($post_ID, 'post_meta'); |
| 657 | $wpdb->insert( $wpdb->postmeta, array( 'post_id' => $post_ID, 'meta_key' => $metakey, 'meta_value' => $metavalue ) ); |
| 658 | $meta_id = $wpdb->insert_id; |
| 659 | do_action( 'added_postmeta', $meta_id, $post_ID, $metakey, $metavalue ); |
| 660 | |
| 661 | return $meta_id; |
| 662 | } |
| 663 | return false; |
| 664 | } // add_meta |
| 665 | |
| 666 | /** |
| 667 | * {@internal Missing Short Description}} |
| 668 | * |