在$sql分配中，您错过了"$event->type"周围的串联点.

You've missed concatenation dots around "$event->type" in your $sql assignment.

在开发过程中，我建议您启用添加错误和警告消息的功能

While developing I recommend you to enable error and warning messages adding

error_reporting(E_ALL);
ini_set('display_errors', 1);

输入您的代码.

PHP语法检查:解析错误:语法错误，您的代码在第62行出现意外的'$ event'(T_VARIABLE).

PHP Syntax Check: Parse error: syntax error, unexpected '$event' (T_VARIABLE) in your code on line 62.

比

500内部服务器错误.

500 Internal Server Error.

或者，如果您需要检查一小段代码，则可以使用一些在线工具，例如 http://phpcodechecker .com/

As an alternative, if you have a small piece of code to check, you can use some online tool like http://phpcodechecker.com/