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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 |
|---|---|
| 454 | * (post, comment, term, user, or any other type with an associated meta table). |
| 455 | * |
| 456 | * @since 2.9.0 |
| 457 | * |
| 458 | * @param string[] $meta_ids An array of metadata entry IDs to delete. |
| 459 | * @param int $object_id ID of the object metadata is for. |
| 460 | * @param string $meta_key Metadata key. |
| 461 | * @param mixed $_meta_value Metadata value. Serialized if non-scalar. |
| 462 | */ |
| 463 | do_action( "deleted_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $_meta_value ); |
| 464 | |
| 465 | // Old-style action. |
| 466 | if ( 'post' === $meta_type ) { |
| 467 | /** |
| 468 | * Fires immediately after deleting metadata for a post. |
| 469 | * |
| 470 | * @since 2.9.0 |
| 471 | * |
| 472 | * @param string[] $meta_ids An array of metadata entry IDs to delete. |
| Line | Code |
| 963 | } |
| 964 | |
| 965 | // Run the query, will return true if deleted, false otherwise. |
| 966 | $result = (bool) $wpdb->delete( $table, array( $id_column => $meta_id ) ); |
| 967 | |
| 968 | // Clear the caches. |
| 969 | wp_cache_delete( $object_id, $meta_type . '_meta' ); |
| 970 | |
| 971 | /** This action is documented in wp-includes/meta.php */ |
| 972 | do_action( "deleted_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value ); |
| 973 | |
| 974 | // Old-style action. |
| 975 | if ( 'post' === $meta_type || 'comment' === $meta_type ) { |
| 976 | /** |
| 977 | * Fires immediately after deleting post or comment metadata of a specific type. |
| 978 | * |
| 979 | * The dynamic portion of the hook, `$meta_type`, refers to the meta |
| 980 | * object type (post or comment). |
| 981 | * |