Example #1
0
 /**
  * Stores a value identified by a key into cache if the cache does not contain this key.
  * Nothing will be done if the cache already contains the key.
  * @param mixed $key a key identifying the value to be cached. This can be a simple string or
  * a complex data structure consisting of factors representing the key.
  * @param mixed $value the value to be cached
  * @param integer $duration the number of seconds in which the cached value will expire. 0 means never expire.
  * @param Dependency $dependency dependency of the cached item. If the dependency changes,
  * the corresponding value in the cache will be invalidated when it is fetched via [[get()]].
  * This parameter is ignored if [[serializer]] is false.
  * @return boolean whether the value is successfully stored into cache
  */
 public function add($key, $value, $duration = 0, $dependency = null)
 {
     if ($dependency !== null && $this->serializer !== false) {
         $dependency->evaluateDependency($this);
     }
     if ($this->serializer === null) {
         $value = serialize([$value, $dependency]);
     } elseif ($this->serializer !== false) {
         $value = call_user_func($this->serializer[0], [$value, $dependency]);
     }
     $key = $this->buildKey($key);
     return $this->addValue($key, $value, $duration);
 }