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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 |
---|---|
623 | * |
624 | * @param mixed $value The value to return, either a single metadata value or an array |
625 | * of values depending on the value of `$single`. Default null. |
626 | * @param int $object_id ID of the object metadata is for. |
627 | * @param string $meta_key Metadata key. |
628 | * @param bool $single Whether to return only the first value of the specified `$meta_key`. |
629 | * @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', |
630 | * or any other object type with an associated meta table. |
631 | */ |
632 | $check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, $single, $meta_type ); |
633 | if ( null !== $check ) { |
634 | if ( $single && is_array( $check ) ) { |
635 | return $check[0]; |
636 | } else { |
637 | return $check; |
638 | } |
639 | } |
640 |
|
641 | $meta_cache = wp_cache_get( $object_id, $meta_type . '_meta' ); |
Line | Code |
736 | return false; |
737 | } |
738 |
|
739 | $object_id = absint( $object_id ); |
740 | if ( ! $object_id ) { |
741 | return false; |
742 | } |
743 |
|
744 | /** This filter is documented in wp-includes/meta.php */ |
745 | $check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, true, $meta_type ); |
746 | if ( null !== $check ) { |
747 | return (bool) $check; |
748 | } |
749 |
|
750 | $meta_cache = wp_cache_get( $object_id, $meta_type . '_meta' ); |
751 |
|
752 | if ( ! $meta_cache ) { |
753 | $meta_cache = update_meta_cache( $meta_type, array( $object_id ) ); |
754 | $meta_cache = $meta_cache[ $object_id ]; |