src/Cache/SharedMemory.php
public function has($key)
    {
        if (shm_has_var($this->shm, $this->shm_key($key))) { // check is isset
            return true;
        } else {
            return false;
        }
    }
public function has($key)
    {
        if (shm_has_var($this->shm, $this->shm_key($key))) { // check is isset
            return true;
        } else {
            return false;
        }
    }
public function has ( $ key ) { if ( shm_has_var ( $ this -> shm , $ this -> shm_key ( $ key ) ) ) { // check is isset return true ; } else { return false ; } }
has var ?

@param $key
@return bool
has var ?