Client/PHPRedis.php
public function setPrefix($s)
    {
        $this->parameters['prefix'] = $s;

        if ($this->connected) {
            $this->setOption(\Redis::OPT_PREFIX, $this->parameters['prefix']);
        }
    }
public function setPrefix($s)
    {
        $this->parameters['prefix'] = $s;

        if ($this->connected) {
            $this->setOption(\Redis::OPT_PREFIX, $this->parameters['prefix']);
        }
    }
Set prefix

@param string $s