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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 |
|---|---|
| 491 | * - `delete_user_meta` |
| 492 | * |
| 493 | * @since 3.1.0 |
| 494 | * |
| 495 | * @param string[] $meta_ids An array of metadata entry IDs to delete. |
| 496 | * @param int $object_id ID of the object metadata is for. |
| 497 | * @param string $meta_key Metadata key. |
| 498 | * @param mixed $_meta_value Metadata value. |
| 499 | */ |
| 500 | do_action( "delete_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $_meta_value ); |
| 501 | |
| 502 | // Old-style action. |
| 503 | if ( 'post' === $meta_type ) { |
| 504 | /** |
| 505 | * Fires immediately before deleting metadata for a post. |
| 506 | * |
| 507 | * @since 2.9.0 |
| 508 | * |
| 509 | * @param string[] $meta_ids An array of metadata entry IDs to delete. |
| Line | Code |
| 1061 | return (bool) $check; |
| 1062 | } |
| 1063 | |
| 1064 | // Fetch the meta and go on if it's found. |
| 1065 | $meta = get_metadata_by_mid( $meta_type, $meta_id ); |
| 1066 | if ( $meta ) { |
| 1067 | $object_id = (int) $meta->{$column}; |
| 1068 | |
| 1069 | /** This action is documented in wp-includes/meta.php */ |
| 1070 | do_action( "delete_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value ); |
| 1071 | |
| 1072 | // Old-style action. |
| 1073 | if ( 'post' === $meta_type || 'comment' === $meta_type ) { |
| 1074 | /** |
| 1075 | * Fires immediately before deleting post or comment metadata of a specific type. |
| 1076 | * |
| 1077 | * The dynamic portion of the hook name, `$meta_type`, refers to the meta |
| 1078 | * object type (post or comment). |
| 1079 | * |