从PHP外部打印PHP运行调用堆栈 [英] Print PHP running call stack from outside the PHP

问题描述

PHP中是否有任何运行时堆栈跟踪功能？
（对于谁也写Java，我的意思是jstack。）

Is there any runtime stack trace feature in PHP, by a given PID of it? (For whom also write Java, I mean jstack.)

我有几个PHP后台进程，他们在一些未知的行上冻结了一会儿。我可以简单地杀死他们，重新启动，但是不要再阻止它再次发生。

I got few PHP background process that they are freeze once a while on some unknown lines. I can simply kill them all and restart but that don't prevent it happen again.

是否有一个API可以监视堆栈并告诉？像JDK提供的jstack工具？

Is there a API able to spy the stack and tell? like the jstack utility provided from JDK?

推荐答案

您有几个可以调试未知错误的选项。

You have a few options in terms of debugging unknown errors.

• 第一种方法很容易，但需要安装PHP扩展名。


• 第二种方法提供了一个更难实践的方法，但如果您进入PHP解释器的低级内部工作，绝对值得。此外，这将需要使用 - 启用调试配置Linux和PHP。


• 第三个，在我个人看来最简单的方法不需要使用任何外部程序或添加的PHP扩展。

• The first method is easy, but requires a PHP extension to be installed.
• The second method offers a more difficult hands-on approach, but is definitely worth it if you're into the low-level inner-workings of the PHP interpreter. Also, this will require linux and PHP to be configured with --enable-debug.
• The third and, in my personal opinion the easiest, method doesn't require the use of any external programs or added PHP extensions.

1. Xdebug

• 这是一个PHP扩展，您可以安装和可用于任何网站/页面。


• 网站功能的快速列表：
  
  
  
  
  • 自动堆栈跟踪
  
  
  • 函数调用记录
  
  
  • 显示增强的var_dump（）输出和代码覆盖信息等功能。
  
  
  
  
  • 如果看到自己需要调试脚本很多，这可能是最好的选择。漂亮的错误显示也是我书中的好主意。
    
    
    
  
  
  • This is a PHP extension you can install and have available for any site/page.
  • A quick-list of features from the website:
    
    • Automatic stack trace upon error
    • Function call logging
    • Display features such as enhanced var_dump() output and code coverage information.

    使用 gdb 运行崩溃并分析回溯的文件。

    Use gdb to run the file that crashes and analyze the backtrace.

    
    
    • 这是一种中间到高级的方法，需要PHP配置为 - enable-debug ，运行 Apache 的linux机器，以及对软件在较低级别上的工作方式的强烈愿望/能力。
    
    
    • 运行 gdb 与 Apache ：
      
      gdb / usr / lib / httpd
    
    
    • 然后，您有两个选项：
      
      
      
      • 将apache作为服务器并加载文件通过浏览器正常：
        
        （gdb）run -X
        
        ...现在，在浏览器中 - 访问正常崩溃的页面并切换回 gdb ：
        （gdb）backtrace
        
        ...将打印完整的追溯
      
      
      • 或者使用 gdb 运行脚本t本身：
        
        （gdb）运行/path/to/the/script.php

（gdb）backtrace
        
        ...将打印完整的追溯
      
      
      • This is an intermediate-to-advanced approach that requires PHP to be configured with --enable-debug, a linux machine running Apache, and a strong desire/ability to understand the way software works on a lower-level.
      • Run gdb with Apache:
        gdb /usr/lib/httpd
      • Then, you have two options.:
        • Run apache as a server and load the file through a browser, as normal:
          (gdb) run -X
          ... now, in your browser - access the page that crashes as normal and switch back to gdb: (gdb) backtrace
          ... the full backtrace will be printed
        • Or, use gdb to run the script itself:
          (gdb) run /path/to/the/script.php
(gdb) backtrace
          ... the full backtrace will be printed

        创建一个自定义错误处理程序，当抛出错误时打印堆栈跟踪。

        Create a custom error handler that prints the stack trace when an error is thrown.

        
        
        • 为了确保捕获所有错误，您可以捕获错误，异常和PHP的关闭事件。
        
        
        • 要调试单个页面，就像创建一个函数来处理错误一样简单，然后将该函数粘贴到您遇到问题的页面顶部。一步一步，我有一个错误处理类在一个单独的文件，只需要包含它（在下面的简化版本）。您可以调整每种方法以适应您的显示需求，甚至可以根据每个错误数量处理错误！
        
        
        • 然后，要使用此选项，只需添加 require （'ErrorHandler.php'）; 到页面顶部，它应该自动注册自己来处理任何错误。当然，请务必更新包含路径以指向实际的文件。
        
        
        • To be sure to catch all errors, you can catch Errors, Exceptions, and PHP's Shutdown events.
        • To debug a single page, it's as simple as creating a function to handle the error and then pasting that function into the top of the page you're having issues on. One step further, I have an "error handling" class that's in a separate file and just include it whenever needed (simplified-version below). You can tweak each method to suit your display needs, or even handle errors on a per-error-number basis!
        • Then, to use this, just add require('ErrorHandler.php'); to the top of your page and it should auto-register itself to handle any errors. Be sure to update the include-path to point to the actual file, of course.

        ErrorHandler.php：

        ErrorHandler.php:

        <?php
        class ErrorHandler {
            public static function captureError($err_no, $message, $file, $line) {
                echo '<strong>Error (#' . $err_no . '):</strong> ' . $message . ' in ' . $file . ' on line #' . $line . '<br />';
                debug_print_backtrace();
            }
        
            public static function captureException($exception) {
                echo '<pre>' . print_r($exception, true) . '</pre>';
            }
        
            public static function captureShutdown() {
                if (($error = error_get_last()) !== null) {
                    debug_print_backtrace();
                }
            }
        }
        set_error_handler(array('ErrorHandler', 'captureError'));
        set_exception_handler(array('ErrorHandler', 'captureException'));
        register_shutdown_function(array('ErrorHandler', 'captureShutdown'));
        ?>
        

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