WP_Object_Cache::_exists( int|string $key, string $group )

Serves as a utility function to determine whether a key exists in the cache.

Parameters

$key

(Required) Cache key to check for existence.

$group

(Required) Cache group for the key existence check.

Return

(bool) Whether the key exists in the cache for the given group.

Source

File: wp-includes/cache.php 

	protected function _exists( $key, $group ) {
		return isset( $this->cache[ $group ] ) && ( isset( $this->cache[ $group ][ $key ] ) || array_key_exists( $key, $this->cache[ $group ] ) );
	}

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Related

Used By

Used By
Used By Description
wp-includes/cache.php: WP_Object_Cache::add()

Adds data to the cache if it doesn’t already exist.
wp-includes/cache.php: WP_Object_Cache::decr()

Decrements numeric cache item’s value.
wp-includes/cache.php: WP_Object_Cache::delete()

Removes the contents of the cache key in the group.
wp-includes/cache.php: WP_Object_Cache::get()

Retrieves the cache contents, if it exists.
wp-includes/cache.php: WP_Object_Cache::incr()

Increments numeric cache item’s value.
wp-includes/cache.php: WP_Object_Cache::replace()

Replaces the contents in the cache, if contents already exist.
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Changelog

Changelog
Version Description
WP-3.4.0 Introduced.