PHP操作Redis 含Redis密碼驗證

<?php  
   $redis = new Redis(); 
   $redis->connect('127.0.0.1', 6379); //連接Redis
   $redis->auth('mypasswords123sdfeak'); //密碼驗證
   $redis->select(2);//選擇數據庫2
   $redis->set( "testKey" , "Hello Redis"); //設置測試key
   echo $redis->get("testKey");//輸出value
?>