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