php - register_shutdown_function() 和 set_error_handler() 可以捕获相同的错误吗？

Question

如果我在同一个脚本中定义了以下内容:

register_shutdown_function('handlerOne');
set_error_handler('handlerTwo');

是否有任何错误类型会触发这两个处理程序？

Answer 1

shutdown function将在脚本执行完成时执行，无论是否有错误、异常。它与错误或异常无关，错误或异常不会触发它，它不会捕获它们，无论如何都会调用它在脚本的末尾，因此如果您想在发生异常或 fatal error 的情况下进行一些工作，这很有用，因为如果发生 fatal error 或异常，错误处理函数不会被执行。

error handler function将在触发错误时执行。这是从手册中引用的

The following error types cannot be handled with a user defined function: E_ERROR, E_PARSE, E_CORE_ERROR, E_CORE_WARNING, E_COMPILE_ERROR, E_COMPILE_WARNING, and most of E_STRICT raised in the file where set_error_handler() is called.

<?php

function shutdownFunction(){
    echo "shutdownFunction is called \n";
} 

function errorHandlerFunction(){
    echo "errorHandlerFunction is called \n";
} 
register_shutdown_function('shutdownFunction');
set_error_handler('errorHandlerFunction');

//echo "foo\n"; // scenario 1 no errors
//echo $undefinedVar; //scenario 2 error is triggered
//undefinedFunction(); //scenario 3 Fatal error is triggered
//throw new \Exception(); //scenario 4 exception is thrown

场景 1(无错误)输出

foo 
shutdownFunction is called

场景 2(触发错误)输出

errorHandlerFunction is called 
shutdownFunction is called 

场景 3(触发 fatal error )输出

Fatal error: Call to undefined function undefinedFunction() in /tmp/execpad-b2a446c7f6a6/source-b2a446c7f6a6 on line 15
shutdownFunction is called

场景 4(抛出异常)输出

Fatal error: Uncaught exception 'Exception' in /tmp/execpad-0b3a18f0ea06/source-0b3a18f0ea06:16
Stack trace:
#0 {main}
thrown in /tmp/execpad-0b3a18f0ea06/source-0b3a18f0ea06 on line 16
shutdownFunction is called 

自己看 https://eval.in/1073642