如何追踪PHP崩溃？

我正试图找出Apache PHP崩溃的原因。我希望有某种设置、工具或其他东西来帮助跟踪导致这些php崩溃的代码、配置或问题

在我的Windows事件日志中（显示apache崩溃，但由php引起）：

该应用程序在WindowsServer2008机器（xampp）上使用Apache、PHP和MySQL

这是我的Apache日志中的崩溃：

[Fri Jun 08 15:56:34 2012] [notice] Parent: child process exited with status 3221225477 -- Restarting.
[Fri Jun 08 15:56:35 2012] [notice] Digest: generating secret for digest authentication ...
[Fri Jun 08 15:56:35 2012] [notice] Digest: done
[Fri Jun 08 15:56:35 2012] [notice] Apache/2.2.21 (Win32) PHP/5.3.8 configured -- resuming normal operations
[Fri Jun 08 15:56:35 2012] [notice] Server built: Sep 10 2011 11:34:11
[Fri Jun 08 15:56:35 2012] [notice] Parent: Created child process 1220
[Fri Jun 08 15:56:35 2012] [notice] Digest: generating secret for digest authentication ...
[Fri Jun 08 15:56:35 2012] [notice] Digest: done
[Fri Jun 08 15:56:35 2012] [notice] Child 1220: Child process is running
[Fri Jun 08 15:56:35 2012] [notice] Child 1220: Acquired the start mutex.
[Fri Jun 08 15:56:35 2012] [notice] Child 1220: Starting 150 worker threads.
[Fri Jun 08 15:56:35 2012] [notice] Child 1220: Starting thread to listen on port 80.
[Fri Jun 08 15:56:35 2012] [notice] Child 1220: Starting thread to listen on port 80.
[Fri Jun 08 15:57:37 2012] [notice] Parent: child process exited with status 3221225477 -- Restarting.
[Fri Jun 08 15:57:37 2012] [notice] Digest: generating secret for digest authentication ...
[Fri Jun 08 15:57:37 2012] [notice] Digest: done
[Fri Jun 08 15:57:37 2012] [notice] Apache/2.2.21 (Win32) PHP/5.3.8 configured -- resuming normal operations
[Fri Jun 08 15:57:37 2012] [notice] Server built: Sep 10 2011 11:34:11
[Fri Jun 08 15:57:37 2012] [notice] Parent: Created child process 3932
[Fri Jun 08 15:57:38 2012] [notice] Digest: generating secret for digest authentication ...
[Fri Jun 08 15:57:38 2012] [notice] Digest: done
[Fri Jun 08 15:57:38 2012] [notice] Child 3932: Child process is running
[Fri Jun 08 15:57:38 2012] [notice] Child 3932: Acquired the start mutex.
[Fri Jun 08 15:57:38 2012] [notice] Child 3932: Starting 150 worker threads.
[Fri Jun 08 15:57:38 2012] [notice] Child 3932: Starting thread to listen on port 80.
[Fri Jun 08 15:57:38 2012] [notice] Child 3932: Starting thread to listen on port 80.

关于我应该尝试什么，或者追溯到什么代码等的工具/技术可能会导致这种情况吗？

由于XAMPP的Apache（用于Windows）是使用MPM（多线程）+线程安全PHP构建的，可能是您遇到了假定的线程安全版本的PHP固有的问题（有关更多信息，请参阅）。这可以解释为什么在单用户模式下运行时从未遇到错误

请让我们知道Uku Loskit的建议是否有用。如果不是，我建议在这样的多用户环境中切换到Prefork+非线程安全的PHP设置

由于MPM必须在编译时选择，因此您需要：

• 自己编译Apache（在技术上是可行的，但据我记忆所及，在Windows上这是一件非常麻烦的事情）
• 查找除XAMPP以外的发行版，该发行版是使用prefork构建的（我不知道任何发行版）

也许您最好尝试使用运行PHP（这个额外的层基本上通过为每个线程启动单独的PHP进程来隔离服务器线程，并且）。这应该可以让你很容易地验证我最初的假设

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只是附带说明：我不认为在Windows服务器上安装Apache有什么意义。您可能想考虑使用IIS，可选地使用FastGCI（参见说明），或者（更好）切换到基于Linux的堆栈。

这可能有助于在工作和现在之间发生了什么变化？它正在工作，它只是随着负载的增加而崩溃。如果只是我在测试，我基本上看不到任何问题。一旦它加载了20多个用户，就开始出现问题。但这仍然适用于他们，他们只是偶尔会收到一次通信错误（这可能意味着数据丢失）。这还在发生吗？是的，还在发生。我已经尝试过禁用几个php扩展，将这些dll移动到bin或system32，对代码进行了一些优化，这些都改善了情况，减少了崩溃的数量，但这仍然在发生。我喜欢你的答案，不过我怎么知道这是否真的是MPM/线程安全的php问题呢（如果关闭MPM可以解决这个问题，那么如何在Apache Windows中关闭MPM，或者是否有其他推荐的解决方法）？我找到了这篇文章，其中有另外两个关于线程安全php问题的链接：另一个：

[Fri Jun 08 15:56:34 2012] [notice] Parent: child process exited with status 3221225477 -- Restarting.
[Fri Jun 08 15:56:35 2012] [notice] Digest: generating secret for digest authentication ...
[Fri Jun 08 15:56:35 2012] [notice] Digest: done
[Fri Jun 08 15:56:35 2012] [notice] Apache/2.2.21 (Win32) PHP/5.3.8 configured -- resuming normal operations
[Fri Jun 08 15:56:35 2012] [notice] Server built: Sep 10 2011 11:34:11
[Fri Jun 08 15:56:35 2012] [notice] Parent: Created child process 1220
[Fri Jun 08 15:56:35 2012] [notice] Digest: generating secret for digest authentication ...
[Fri Jun 08 15:56:35 2012] [notice] Digest: done
[Fri Jun 08 15:56:35 2012] [notice] Child 1220: Child process is running
[Fri Jun 08 15:56:35 2012] [notice] Child 1220: Acquired the start mutex.
[Fri Jun 08 15:56:35 2012] [notice] Child 1220: Starting 150 worker threads.
[Fri Jun 08 15:56:35 2012] [notice] Child 1220: Starting thread to listen on port 80.
[Fri Jun 08 15:56:35 2012] [notice] Child 1220: Starting thread to listen on port 80.
[Fri Jun 08 15:57:37 2012] [notice] Parent: child process exited with status 3221225477 -- Restarting.
[Fri Jun 08 15:57:37 2012] [notice] Digest: generating secret for digest authentication ...
[Fri Jun 08 15:57:37 2012] [notice] Digest: done
[Fri Jun 08 15:57:37 2012] [notice] Apache/2.2.21 (Win32) PHP/5.3.8 configured -- resuming normal operations
[Fri Jun 08 15:57:37 2012] [notice] Server built: Sep 10 2011 11:34:11
[Fri Jun 08 15:57:37 2012] [notice] Parent: Created child process 3932
[Fri Jun 08 15:57:38 2012] [notice] Digest: generating secret for digest authentication ...
[Fri Jun 08 15:57:38 2012] [notice] Digest: done
[Fri Jun 08 15:57:38 2012] [notice] Child 3932: Child process is running
[Fri Jun 08 15:57:38 2012] [notice] Child 3932: Acquired the start mutex.
[Fri Jun 08 15:57:38 2012] [notice] Child 3932: Starting 150 worker threads.
[Fri Jun 08 15:57:38 2012] [notice] Child 3932: Starting thread to listen on port 80.
[Fri Jun 08 15:57:38 2012] [notice] Child 3932: Starting thread to listen on port 80.