kernel/lib/Cache/Redis.php
public function add(string $sName, $mValue, int $iExpire = false)
    {
        return $this->set($sName, $mValue, 0, $iExpire);
    }
public function add(string $sName, $mValue, int $iExpire = false)
    {
        return $this->set($sName, $mValue, 0, $iExpire);
    }
add

@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 mixed