10 views 
Summery Summery
Determines if a meta key is set for a given object.
Syntax Syntax
Parameters Parameters
- $meta_type
-
(Required) Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', or any other object type with an associated meta table.
- $object_id
-
(Required) ID of the object metadata is for.
- $meta_key
-
(Required) Metadata key.
Return Return
(bool) True of the key is set, false if not.
Source Source
File: wp-includes/meta.php
$check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, $single, $meta_type );
if ( null !== $check ) {
if ( $single && is_array( $check ) ) {
return $check[0];
} else {
return $check;
}
}
$meta_cache = wp_cache_get( $object_id, $meta_type . '_meta' );
if ( ! $meta_cache ) {
$meta_cache = update_meta_cache( $meta_type, array( $object_id ) );
if ( isset( $meta_cache[ $object_id ] ) ) {
$meta_cache = $meta_cache[ $object_id ];
} else {
$meta_cache = null;
}
}
if ( ! $meta_key ) {
return $meta_cache;
}
if ( isset( $meta_cache[ $meta_key ] ) ) {
if ( $single ) {
return maybe_unserialize( $meta_cache[ $meta_key ][0] );
} else {
return array_map( 'maybe_unserialize', $meta_cache[ $meta_key ] );
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Changelog Changelog
| Version | Description |
|---|---|
| 3.3.0 | Introduced. |