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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 |
---|---|
505 | * |
506 | * @since 3.1.0 |
507 | * |
508 | * @param null|array|string $value The value get_metadata() should return - a single metadata value, |
509 | * or an array of values. |
510 | * @param int $object_id ID of the object metadata is for. |
511 | * @param string $meta_key Metadata key. |
512 | * @param bool $single Whether to return only the first value of the specified $meta_key. |
513 | */ |
514 | $check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, $single ); |
515 | if ( null !== $check ) { |
516 | if ( $single && is_array( $check ) ) { |
517 | return $check[0]; |
518 | } else { |
519 | return $check; |
520 | } |
521 | } |
522 |
|
523 | $meta_cache = wp_cache_get( $object_id, $meta_type . '_meta' ); |
Line | Code |
566 | return false; |
567 | } |
568 |
|
569 | $object_id = absint( $object_id ); |
570 | if ( ! $object_id ) { |
571 | return false; |
572 | } |
573 |
|
574 | /** This filter is documented in wp-includes/meta.php */ |
575 | $check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, true ); |
576 | if ( null !== $check ) { |
577 | return (bool) $check; |
578 | } |
579 |
|
580 | $meta_cache = wp_cache_get( $object_id, $meta_type . '_meta' ); |
581 |
|
582 | if ( ! $meta_cache ) { |
583 | $meta_cache = update_meta_cache( $meta_type, array( $object_id ) ); |
584 | $meta_cache = $meta_cache[ $object_id ]; |