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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.
Line | Code |
---|---|
1026 | * The dynamic portion of the hook, `$meta_type`, refers to the meta object type |
1027 | * (post, comment, term, user, or any other type with an associated meta table). |
1028 | * Returning a non-null value will effectively short-circuit the function. |
1029 | * |
1030 | * @since 5.0.0 |
1031 | * |
1032 | * @param mixed $check Whether to allow updating the meta cache of the given type. |
1033 | * @param int[] $object_ids Array of object IDs to update the meta cache for. |
1034 | */ |
1035 | $check = apply_filters( "update_{$meta_type}_metadata_cache", null, $object_ids ); |
1036 | if ( null !== $check ) { |
1037 | return (bool) $check; |
1038 | } |
1039 |
|
1040 | $cache_key = $meta_type . '_meta'; |
1041 | $non_cached_ids = array(); |
1042 | $cache = array(); |
1043 | $cache_values = wp_cache_get_multiple( $object_ids, $cache_key ); |
1044 |
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