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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 |
---|---|
561 | * |
562 | * @param mixed $value The value to return, either a single metadata value or an array |
563 | * of values depending on the value of `$single`. Default null. |
564 | * @param int $object_id ID of the object metadata is for. |
565 | * @param string $meta_key Metadata key. |
566 | * @param bool $single Whether to return only the first value of the specified `$meta_key`. |
567 | * @param string $meta_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', |
568 | * or any other object type with an associated meta table. |
569 | */ |
570 | $check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, $single, $meta_type ); |
571 | if ( null !== $check ) { |
572 | if ( $single && is_array( $check ) ) { |
573 | return $check[0]; |
574 | } else { |
575 | return $check; |
576 | } |
577 | } |
578 |
|
579 | $meta_cache = wp_cache_get( $object_id, $meta_type . '_meta' ); |
Line | Code |
674 | return false; |
675 | } |
676 |
|
677 | $object_id = absint( $object_id ); |
678 | if ( ! $object_id ) { |
679 | return false; |
680 | } |
681 |
|
682 | /** This filter is documented in wp-includes/meta.php */ |
683 | $check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, true, $meta_type ); |
684 | if ( null !== $check ) { |
685 | return (bool) $check; |
686 | } |
687 |
|
688 | $meta_cache = wp_cache_get( $object_id, $meta_type . '_meta' ); |
689 |
|
690 | if ( ! $meta_cache ) { |
691 | $meta_cache = update_meta_cache( $meta_type, array( $object_id ) ); |
692 | $meta_cache = $meta_cache[ $object_id ]; |