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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 |
|---|---|
| 821 | * Fires immediately before deleting post or comment metadata of a specific type. |
| 822 | * |
| 823 | * The dynamic portion of the hook, `$meta_type`, refers to the meta |
| 824 | * object type (post or comment). |
| 825 | * |
| 826 | * @since 3.4.0 |
| 827 | * |
| 828 | * @param int $meta_id ID of the metadata entry to delete. |
| 829 | */ |
| 830 | do_action( "delete_{$meta_type}meta", $meta_id ); |
| 831 | } |
| 832 | |
| 833 | // Run the query, will return true if deleted, false otherwise |
| 834 | $result = (bool) $wpdb->delete( $table, array( $id_column => $meta_id ) ); |
| 835 | |
| 836 | // Clear the caches. |
| 837 | wp_cache_delete( $object_id, $meta_type . '_meta' ); |
| 838 | |
| 839 | /** This action is documented in wp-includes/meta.php */ |