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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 |
|---|---|
| 1043 | * - `delete_postmeta` |
| 1044 | * - `delete_commentmeta` |
| 1045 | * - `delete_termmeta` |
| 1046 | * - `delete_usermeta` |
| 1047 | * |
| 1048 | * @since 3.4.0 |
| 1049 | * |
| 1050 | * @param int $meta_id ID of the metadata entry to delete. |
| 1051 | */ |
| 1052 | do_action( "delete_{$meta_type}meta", $meta_id ); |
| 1053 | } |
| 1054 | |
| 1055 | // Run the query, will return true if deleted, false otherwise. |
| 1056 | $result = (bool) $wpdb->delete( $table, array( $id_column => $meta_id ) ); |
| 1057 | |
| 1058 | // Clear the caches. |
| 1059 | wp_cache_delete( $object_id, $meta_type . '_meta' ); |
| 1060 | |
| 1061 | /** This action is documented in wp-includes/meta.php */ |