kernel/lib/Cache/Mock.php
public function set(string $sName, $mValue, int $iFlag = 0, int $iExpire = false)
    {
        return true;
    }
public function set(string $sName, $mValue, int $iFlag = 0, int $iExpire = false)
    {
        return true;
    }
set a value

@access public
@param  string $sName name of the session
@param  mixed $mValue value of this sesion var
@param  int $iFlag unused
@param  int $iExpire expiration of cache
@return boolean