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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 |
---|---|
480 | * |
481 | * @since 3.1.0 |
482 | * |
483 | * @param null|array|string $value The value get_metadata() should return - a single metadata value, |
484 | * or an array of values. |
485 | * @param int $object_id Object ID. |
486 | * @param string $meta_key Meta key. |
487 | * @param bool $single Whether to return only the first value of the specified $meta_key. |
488 | */ |
489 | $check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, $single ); |
490 | if ( null !== $check ) { |
491 | if ( $single && is_array( $check ) ) |
492 | return $check[0]; |
493 | else |
494 | return $check; |
495 | } |
496 |
|
497 | $meta_cache = wp_cache_get($object_id, $meta_type . '_meta'); |
498 |
|
Line | Code |
533 | return false; |
534 | } |
535 |
|
536 | $object_id = absint( $object_id ); |
537 | if ( ! $object_id ) { |
538 | return false; |
539 | } |
540 |
|
541 | /** This filter is documented in wp-includes/meta.php */ |
542 | $check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, true ); |
543 | if ( null !== $check ) |
544 | return (bool) $check; |
545 |
|
546 | $meta_cache = wp_cache_get( $object_id, $meta_type . '_meta' ); |
547 |
|
548 | if ( !$meta_cache ) { |
549 | $meta_cache = update_meta_cache( $meta_type, array( $object_id ) ); |
550 | $meta_cache = $meta_cache[$object_id]; |
551 | } |