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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 |
|---|---|
| 476 | * |
| 477 | * @since 3.1.0 |
| 478 | * |
| 479 | * @param null|array|string $value The value get_metadata() should return - a single metadata value, |
| 480 | * or an array of values. |
| 481 | * @param int $object_id Object ID. |
| 482 | * @param string $meta_key Meta key. |
| 483 | * @param bool $single Whether to return only the first value of the specified $meta_key. |
| 484 | */ |
| 485 | $check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, $single ); |
| 486 | if ( null !== $check ) { |
| 487 | if ( $single && is_array( $check ) ) |
| 488 | return $check[0]; |
| 489 | else |
| 490 | return $check; |
| 491 | } |
| 492 | |
| 493 | $meta_cache = wp_cache_get($object_id, $meta_type . '_meta'); |
| 494 | |
| Line | Code |
| 529 | return false; |
| 530 | } |
| 531 | |
| 532 | $object_id = absint( $object_id ); |
| 533 | if ( ! $object_id ) { |
| 534 | return false; |
| 535 | } |
| 536 | |
| 537 | /** This filter is documented in wp-includes/meta.php */ |
| 538 | $check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, true ); |
| 539 | if ( null !== $check ) |
| 540 | return (bool) $check; |
| 541 | |
| 542 | $meta_cache = wp_cache_get( $object_id, $meta_type . '_meta' ); |
| 543 | |
| 544 | if ( !$meta_cache ) { |
| 545 | $meta_cache = update_meta_cache( $meta_type, array( $object_id ) ); |
| 546 | $meta_cache = $meta_cache[$object_id]; |
| 547 | } |