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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 |
|---|---|
| 324 | * |
| 325 | * @param null|bool $delete Whether to allow metadata deletion of the given type. |
| 326 | * @param int $object_id Object ID. |
| 327 | * @param string $meta_key Meta key. |
| 328 | * @param mixed $meta_value Meta value. Must be serializable if non-scalar. |
| 329 | * @param bool $delete_all Whether to delete the matching metadata entries |
| 330 | * for all objects, ignoring the specified $object_id. |
| 331 | * Default false. |
| 332 | */ |
| 333 | $check = apply_filters( "delete_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $delete_all ); |
| 334 | if ( null !== $check ) |
| 335 | return (bool) $check; |
| 336 | |
| 337 | $_meta_value = $meta_value; |
| 338 | $meta_value = maybe_serialize( $meta_value ); |
| 339 | |
| 340 | $query = $wpdb->prepare( "SELECT $id_column FROM $table WHERE meta_key = %s", $meta_key ); |
| 341 | |
| 342 | if ( !$delete_all ) |