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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.
This hook occurs 2 times in this file.
Line | Code |
---|---|
468 | * - `delete_user_meta` |
469 | * |
470 | * @since 3.1.0 |
471 | * |
472 | * @param string[] $meta_ids An array of metadata entry IDs to delete. |
473 | * @param int $object_id ID of the object metadata is for. |
474 | * @param string $meta_key Metadata key. |
475 | * @param mixed $_meta_value Metadata value. |
476 | */ |
477 | do_action( "delete_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $_meta_value ); |
478 |
|
479 | // Old-style action. |
480 | if ( 'post' === $meta_type ) { |
481 | /** |
482 | * Fires immediately before deleting metadata for a post. |
483 | * |
484 | * @since 2.9.0 |
485 | * |
486 | * @param string[] $meta_ids An array of metadata entry IDs to delete. |
Line | Code |
1023 | return (bool) $check; |
1024 | } |
1025 |
|
1026 | // Fetch the meta and go on if it's found. |
1027 | $meta = get_metadata_by_mid( $meta_type, $meta_id ); |
1028 | if ( $meta ) { |
1029 | $object_id = (int) $meta->{$column}; |
1030 |
|
1031 | /** This action is documented in wp-includes/meta.php */ |
1032 | do_action( "delete_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value ); |
1033 |
|
1034 | // Old-style action. |
1035 | if ( 'post' === $meta_type || 'comment' === $meta_type ) { |
1036 | /** |
1037 | * Fires immediately before deleting post or comment metadata of a specific type. |
1038 | * |
1039 | * The dynamic portion of the hook name, `$meta_type`, refers to the meta |
1040 | * object type (post or comment). |
1041 | * |