试图让（p）redis运行？

Question

我试图让（p）redis运行但是只要我添加一个set-＆gt;就无法连接到redis

require "predis/autoload.php";
Predis\Autoloader::register();
try {
  $redis = new Predis\Client();
  $redis->set("hello_world", "Hi from php!");
  $value = $redis->get("hello_world");
  var_dump($value);
  echo "Successfully connected to Redis";
}

但是

时它可以连接到Redis

require "predis/autoload.php";
Predis\Autoloader::register();
try {
  $redis = new Predis\Client();
  var_dump($redis);
  echo "Successfully connected to Redis";
}

任何提示？