kernel/lib/Cache/File.php
public function set(string $sName, $mValue, int $iFlag, int $iExpire)
    {
        file_put_contents($this->_sFolder.$this->_getSubDirectory($sName).md5($sName).'.fil.cac', serialize($mValue));
        return $this;
    }
public function set(string $sName, $mValue, int $iFlag, int $iExpire)
    {
        file_put_contents($this->_sFolder.$this->_getSubDirectory($sName).md5($sName).'.fil.cac', serialize($mValue));
        return $this;
    }
set a value

@access public
@param  string $sName name of the session
@param  mixed $mValue value of this sesion var
@param  int $iFlag flags
@param  int $iExpire expiration of cache
@return \Venus\lib\Cache\File