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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 |
|---|---|
| 771 | $meta_value = maybe_serialize( stripslashes_deep( $meta_value ) ); |
| 772 | $meta_id = (int) $meta_id; |
| 773 | |
| 774 | $data = compact( 'meta_key', 'meta_value' ); |
| 775 | $where = compact( 'meta_id' ); |
| 776 | |
| 777 | do_action( 'update_postmeta', $meta_id, $post_id, $meta_key, $meta_value ); |
| 778 | $rval = $wpdb->update( $wpdb->postmeta, $data, $where ); |
| 779 | wp_cache_delete($post_id, 'post_meta'); |
| 780 | do_action( 'updated_postmeta', $meta_id, $post_id, $meta_key, $meta_value ); |
| 781 | |
| 782 | return $rval; |
| 783 | } |
| 784 | |
| 785 | // |
| 786 | // Private |
| 787 | // |
| 788 | |
| 789 | /** |