Predis\Command\Processor\KeyPrefixProcessor::setPrefix PHP Method

    public function setPrefix($prefix)
    {
        $this->prefix = $prefix;
    }

 /**
  * @group disconnected
  */
 public function testChangePrefix()
 {
     $prefix1 = 'prefix:';
     $prefix2 = 'prefix:new:';
     $processor = new KeyPrefixProcessor($prefix1);
     $this->assertEquals($prefix1, $processor->getPrefix());
     $processor->setPrefix($prefix2);
     $this->assertEquals($prefix2, $processor->getPrefix());
 }