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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 |
---|---|
527 | // Old-style action. |
528 | if ( 'post' === $meta_type ) { |
529 | /** |
530 | * Fires immediately after deleting metadata for a post. |
531 | * |
532 | * @since 2.9.0 |
533 | * |
534 | * @param string[] $meta_ids An array of metadata entry IDs to delete. |
535 | */ |
536 | do_action( 'deleted_postmeta', $meta_ids ); |
537 | } |
538 |
|
539 | return true; |
540 | } |
541 |
|
542 | /** |
543 | * Retrieves the value of a metadata field for the specified object type and ID. |
544 | * |
545 | * If the meta field exists, a single value is returned if `$single` is true, |