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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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417 | * |
418 | * @param null|bool $delete Whether to allow metadata deletion of the given type. |
419 | * @param int $object_id ID of the object metadata is for. |
420 | * @param string $meta_key Metadata key. |
421 | * @param mixed $meta_value Metadata value. Must be serializable if non-scalar. |
422 | * @param bool $delete_all Whether to delete the matching metadata entries |
423 | * for all objects, ignoring the specified $object_id. |
424 | * Default false. |
425 | */ |
426 | $check = apply_filters( "delete_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $delete_all ); |
427 | if ( null !== $check ) { |
428 | return (bool) $check; |
429 | } |
430 |
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431 | $_meta_value = $meta_value; |
432 | $meta_value = maybe_serialize( $meta_value ); |
433 |
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434 | $query = $wpdb->prepare( "SELECT $id_column FROM $table WHERE meta_key = %s", $meta_key ); |
435 |
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