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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 |
---|---|
477 | * |
478 | * @since 3.1.0 |
479 | * |
480 | * @param null|array|string $value The value get_metadata() should return - a single metadata value, |
481 | * or an array of values. |
482 | * @param int $object_id Object ID. |
483 | * @param string $meta_key Meta key. |
484 | * @param bool $single Whether to return only the first value of the specified $meta_key. |
485 | */ |
486 | $check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, $single ); |
487 | if ( null !== $check ) { |
488 | if ( $single && is_array( $check ) ) |
489 | return $check[0]; |
490 | else |
491 | return $check; |
492 | } |
493 |
|
494 | $meta_cache = wp_cache_get($object_id, $meta_type . '_meta'); |
495 |
|
Line | Code |
530 | return false; |
531 | } |
532 |
|
533 | $object_id = absint( $object_id ); |
534 | if ( ! $object_id ) { |
535 | return false; |
536 | } |
537 |
|
538 | /** This filter is documented in wp-includes/meta.php */ |
539 | $check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, true ); |
540 | if ( null !== $check ) |
541 | return (bool) $check; |
542 |
|
543 | $meta_cache = wp_cache_get( $object_id, $meta_type . '_meta' ); |
544 |
|
545 | if ( !$meta_cache ) { |
546 | $meta_cache = update_meta_cache( $meta_type, array( $object_id ) ); |
547 | $meta_cache = $meta_cache[$object_id]; |
548 | } |