如何调试 PHP 中的类重定义？
我收到 PHP Fatal error: Cannot redeclare class Foo in /directory/ on line 20 错误，但我不知道它来自哪里。我总是对此类文件使用 require_once ，但我不知道如何调试它。我可以以某种方式获得某种包含堆栈跟踪吗？我正在运行 PHP 5，因此此处描述的区分大小写应该不是问题： http://www.php.net/manual/en/function.include-once.php。
I'm getting a PHP Fatal error: Cannot redeclare class Foo in /directory/ on line 20 error, but I have no idea where it's coming from. I'm always using require_once for this class file, and I'm not sure how to debug it. Can I get some kind of inclusion stack trace somehow? I'm running PHP 5, so case sensitivity such as descriped here should not be a problem: http://www.php.net/manual/en/function.include-once.php.
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在声明类的文件中但在声明之前使用 debug_backtrace
Use debug_backtrace in file where is class declared, but before it's declaration
另一种方法是重命名重新定义的类（也重命名包含该类的文件），然后修复由此产生的所有类未找到错误。这应该会引导您找到导致重新定义的代码。就我而言，是 class_alias 语句导致了问题。
Another approach is to rename the class that was redefined (also rename the file containing the class) and then fix all class-not-found errors you get from that. That should lead you to the code that is causing the redefinition. In my case it was a class_alias statement that was causing the problem.