Commit a2b946e4 by Alexander Makarov

Zend Data Cache returns null when record doesn't exist (reverted from commit…

Zend Data Cache returns null when record doesn't exist (reverted from commit 590121c4)
parent 887a9aa6
......@@ -21,25 +21,6 @@ namespace yii\caching;
class ZendDataCache extends Cache
{
/**
* Checks whether a specified key exists in the cache.
* This can be faster than getting the value from the cache if the data is big.
* In case a cache does not support this feature natively, this method will try to simulate it
* but has no performance improvement over getting it.
* Note that this method does not check whether the dependency associated
* with the cached data, if there is any, has changed. So a call to [[get]]
* may return false while exists returns true.
* @param mixed $key a key identifying the cached value. This can be a simple string or
* a complex data structure consisting of factors representing the key.
* @return boolean true if a value exists in cache, false if the value is not in the cache or expired.
*/
public function exists($key)
{
$key = $this->buildKey($key);
$value = $this->getValue($key);
return $value !== null;
}
/**
* Retrieves a value from cache with a specified key.
* This is the implementation of the method declared in the parent class.
* @param string $key a unique key identifying the cached value
......
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