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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 |
|---|---|
| 439 | * @since 3.1.0 |
| 440 | * |
| 441 | * @param null|array|string $value The value get_metadata() should |
| 442 | * return - a single metadata value, |
| 443 | * or an array of values. |
| 444 | * @param int $object_id Object ID. |
| 445 | * @param string $meta_key Meta key. |
| 446 | * @param string|array $single Meta value, or an array of values. |
| 447 | */ |
| 448 | $check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, $single ); |
| 449 | if ( null !== $check ) { |
| 450 | if ( $single && is_array( $check ) ) |
| 451 | return $check[0]; |
| 452 | else |
| 453 | return $check; |
| 454 | } |
| 455 | |
| 456 | $meta_cache = wp_cache_get($object_id, $meta_type . '_meta'); |
| 457 | |
| Line | Code |
| 488 | */ |
| 489 | function metadata_exists( $meta_type, $object_id, $meta_key ) { |
| 490 | if ( ! $meta_type ) |
| 491 | return false; |
| 492 | |
| 493 | if ( ! $object_id = absint( $object_id ) ) |
| 494 | return false; |
| 495 | |
| 496 | /** This filter is documented in wp-includes/meta.php */ |
| 497 | $check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, true ); |
| 498 | if ( null !== $check ) |
| 499 | return (bool) $check; |
| 500 | |
| 501 | $meta_cache = wp_cache_get( $object_id, $meta_type . '_meta' ); |
| 502 | |
| 503 | if ( !$meta_cache ) { |
| 504 | $meta_cache = update_meta_cache( $meta_type, array( $object_id ) ); |
| 505 | $meta_cache = $meta_cache[$object_id]; |
| 506 | } |