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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 ]; |