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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 |
|---|---|
| 502 | * |
| 503 | * @since 3.1.0 |
| 504 | * |
| 505 | * @param null|array|string $value The value get_metadata() should return - a single metadata value, |
| 506 | * or an array of values. |
| 507 | * @param int $object_id Object ID. |
| 508 | * @param string $meta_key Meta key. |
| 509 | * @param bool $single Whether to return only the first value of the specified $meta_key. |
| 510 | */ |
| 511 | $check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, $single ); |
| 512 | if ( null !== $check ) { |
| 513 | if ( $single && is_array( $check ) ) { |
| 514 | return $check[0]; |
| 515 | } else { |
| 516 | return $check; |
| 517 | } |
| 518 | } |
| 519 | |
| 520 | $meta_cache = wp_cache_get( $object_id, $meta_type . '_meta' ); |
| Line | Code |
| 558 | return false; |
| 559 | } |
| 560 | |
| 561 | $object_id = absint( $object_id ); |
| 562 | if ( ! $object_id ) { |
| 563 | return false; |
| 564 | } |
| 565 | |
| 566 | /** This filter is documented in wp-includes/meta.php */ |
| 567 | $check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, true ); |
| 568 | if ( null !== $check ) { |
| 569 | return (bool) $check; |
| 570 | } |
| 571 | |
| 572 | $meta_cache = wp_cache_get( $object_id, $meta_type . '_meta' ); |
| 573 | |
| 574 | if ( ! $meta_cache ) { |
| 575 | $meta_cache = update_meta_cache( $meta_type, array( $object_id ) ); |
| 576 | $meta_cache = $meta_cache[ $object_id ]; |