Question

我希望能够捕获die()和exit()条消息。这可能吗？我希望有类似于set_error_handler和set_exception_handler的内容。我查看了register_shutdown_function()，但它似乎没有包含违规die()和exit()来电的背景信息。

我意识到die()和exit()是处理错误的不良方法。我不希望被告知不要这样做。 :)我正在创建一个通用系统，并希望能够优雅地记录exit()和die()如果由于某种原因某人（不是我）决定这是一个好主意。

Answer 1

是的，你可以，但你需要 ob_start ， ob_get_contents ， ob_end_clean 和 register_shutdown_function

function onDie(){
    $message = ob_get_contents(); // Capture 'Doh'
    ob_end_clean(); // Cleans output buffer
    callWhateverYouWant();
}
register_shutdown_function('onDie');
//...
ob_start(); // You need this to turn on output buffering before using die/exit
@$dumbVar = 1000/0 or die('Doh'); // "@" prevent warning/error from php
//...
ob_end_clean(); // Remember clean your buffer before you need to use echo/print

Answer 2

根据PHP manual，当调用die（）或exit（）时，仍应通知关闭函数。

即使调用exit（），
Shutdown functions和object destructors也会一直执行。

似乎无法在退出（$ status）中获取状态。除非你可以使用输出缓冲来捕获它，但我不知道你怎么知道何时调用ob_start()。

Answer 3

如果APD可用，也许override_function()会很有趣

Answer 4

尽我所知，这是不可能的。这里发布的一些解决方案可能有效，但它们需要大量额外工作或许多依赖项。没有办法轻松可靠地捕获die（）和exit（）消息。

Answer 5

为什么不使用自定义错误处理？如果没有，你总是可以使用LD_PRELOAD和C代码注入来捕获它:)或者使用你的自定义重新编译php：P

Answer 6

如果使用单一入口点方法。（index.php）我可以推荐这个用于你的错误处理：

简短版：

ob_start();
register_shutdown_function('shutdownHandler');

include('something');

define(CLEAN_EXIT, true);

function shutdownHandler() {
    if(!defined("CLEAN_EXIT") || !CLEAN_EXIT) {
        $msg = "Script stopped unexpectedly: ".ob_get_contents();
        //Handle premature die()/exit() here
    }
}

其他步骤更详细：

大致是这样做的。我还有比我在这里展示的更多（处理数据库事务/回滚/发送电子邮件/写日志/显示友好的错误消息/用户错误报告/等），但这是所有这些背后的基本思想。登记/> 希望它可以帮到某人。

<?php

    //Some initialization

    //starting output buffering. (fatalErrorHandler is optional, but I recommend using it) 
    ob_start('fatalErrorHandler');

    //Execute code right at the end. Catch exit() and die() here. But also all other terminations inside PHPs control
    register_shutdown_function('shutdownHandler');

    //handling other errors: Also optional
    set_error_handler('errorHandler');



    try {
        //Include of offensive code
        include(...);
    }
    catch (Exception $ex) {
        //Handling exception. Be careful to not raise exceptions here again. As you can end up in a cycle. 
    }

    //Code reached this point, so it was a clean exit.
    define(CLEAN_EXIT, true);


    //Gets called when the script engine shuts down.
    function shutdownHandler() {

        $status = connection_status();

        $statusText = "";

        switch ($status) {
            case 0:
                if (!defined("CLEAN_EXIT") || !CLEAN_EXIT) {
                                    $msg = "Script stopped unexpectedly: ".ob_get_contents();
                    //Handle premature die()/exit() here
                }
                else {
                    //Clean exit. Just return
                    return;
                }
            case 1: $statusText = "ABORTED (1)"; break;
            case 2: $statusText = "TIMEOUT (2)"; break;
            case 3: $statusText = "ABORTED & TIMEOUT (3)"; break;

            default : $statusText = "UNKNOWN ($status)"; break;
        }

        //Handle other exit variants saved in $statusText here ob_get_contents() can have additional useful information here
    }

    // error handler function  (This is optional in your case)
    function errorHandler($errno, $errstr, $errfile, $errline) {

        $msg = "[$errno] $errstr\nOn line $errline in file $errfile";

        switch ($errno) {
            case E_ERROR:               $msg = "[E_ERROR] ".$msg;               break;
            case E_WARNING:             $msg = "[E_WARNING] ".$msg;             break;
            case E_PARSE:               $msg = "[E_PARSE] ".$msg;               break;
            case E_NOTICE:              $msg = "[E_NOTICE] ".$msg;              break;
            case E_CORE_ERROR:          $msg = "[E_CORE_ERROR] ".$msg;          break;
            case E_CORE_WARNING:        $msg = "[E_CORE_WARNING] ".$msg;        break;
            case E_COMPILE_ERROR:       $msg = "[E_COMPILE_ERROR] ".$msg;       break;
            case E_COMPILE_WARNING:     $msg = "[E_COMPILE_WARNING] ".$msg;     break;
            case E_USER_ERROR:          $msg = "[E_USER_ERROR] ".$msg;          break;
            case E_USER_WARNING:        $msg = "[E_USER_WARNING] ".$msg;        break;
            case E_USER_NOTICE:         $msg = "[E_USER_NOTICE] ".$msg;         break;
            case E_STRICT:              $msg = "[E_STRICT] ".$msg;              break;
            case E_RECOVERABLE_ERROR:   $msg = "[E_RECOVERABLE_ERROR] ".$msg;   break;
            case E_DEPRECATED:          $msg = "[E_DEPRECIATED] ".$msg;         break;
            case E_USER_DEPRICIATED:    $msg = "[E_USER_DEPRICIATED] ".$msg;    break;
            default:                    $msg = "[UNKNOWN] ".$msg;               break;
        }

        //Handle Normal error/notice/warning here. 
        $handled = ...

        if ($handled)
            return true; //handled. Proceed execution
        else
            throw Exception($msg); //Be careful. this might quickly become cyclic. Be sure to have code that catches and handles exceptions. Else die() here after logging/reporting the error.

    }

    function fatalErrorHandler(&$buffer) {

        $matches = null;
        //Checking if the output contains a fatal error
        if (preg_match('/<br \/>\s*<b>([^<>].*)error<\/b>:(.*)<br \/>$/', $buffer, $matches) ) {

            $msg = preg_replace('/<.*?>/','',$matches[2]);

            //Handle Fatal error here

            return "There was an unexpected situation that resulted in an error. We have been informed and will look into it."
         }

         //No fatal exception. Return buffer and continue
         return $buffer;
    }

Answer 7

是的：编写一个函数并使用它。

function kill($msg){
    // Do your logging..
    exit($msg);
}

我可以捕获exit（）和die（）消息吗？

7 个答案: