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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 |
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309 | * |
310 | * @param null|bool $delete Whether to allow metadata deletion of the given type. |
311 | * @param int $object_id Object ID. |
312 | * @param string $meta_key Meta key. |
313 | * @param mixed $meta_value Meta value. Must be serializable if non-scalar. |
314 | * @param bool $delete_all Whether to delete the matching metadata entries |
315 | * for all objects, ignoring the specified $object_id. |
316 | * Default false. |
317 | */ |
318 | $check = apply_filters( "delete_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $delete_all ); |
319 | if ( null !== $check ) |
320 | return (bool) $check; |
321 |
|
322 | $_meta_value = $meta_value; |
323 | $meta_value = maybe_serialize( $meta_value ); |
324 |
|
325 | $query = $wpdb->prepare( "SELECT $id_column FROM $table WHERE meta_key = %s", $meta_key ); |
326 |
|
327 | if ( !$delete_all ) |