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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 |
|---|---|
| 457 | * @since 3.1.0 |
| 458 | * |
| 459 | * @param null|array|string $value The value get_metadata() should |
| 460 | * return - a single metadata value, |
| 461 | * or an array of values. |
| 462 | * @param int $object_id Object ID. |
| 463 | * @param string $meta_key Meta key. |
| 464 | * @param string|array $single Meta value, or an array of values. |
| 465 | */ |
| 466 | $check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, $single ); |
| 467 | if ( null !== $check ) { |
| 468 | if ( $single && is_array( $check ) ) |
| 469 | return $check[0]; |
| 470 | else |
| 471 | return $check; |
| 472 | } |
| 473 | |
| 474 | $meta_cache = wp_cache_get($object_id, $meta_type . '_meta'); |
| 475 | |
| Line | Code |
| 509 | return false; |
| 510 | } |
| 511 | |
| 512 | $object_id = absint( $object_id ); |
| 513 | if ( ! $object_id ) { |
| 514 | return false; |
| 515 | } |
| 516 | |
| 517 | /** This filter is documented in wp-includes/meta.php */ |
| 518 | $check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, true ); |
| 519 | if ( null !== $check ) |
| 520 | return (bool) $check; |
| 521 | |
| 522 | $meta_cache = wp_cache_get( $object_id, $meta_type . '_meta' ); |
| 523 | |
| 524 | if ( !$meta_cache ) { |
| 525 | $meta_cache = update_meta_cache( $meta_type, array( $object_id ) ); |
| 526 | $meta_cache = $meta_cache[$object_id]; |
| 527 | } |