Detailed introduction to the usage of error_reporting function in PHP_php example

This article mainly introduces relevant information about the detailed usage of the error_reporting function in PHP. Friends who need it can refer to it

Detailed introduction to the usage of the error_reporting function in PHP

PHP uses the error_reporting function to handle errors. The most common one is error_reporting(E_ALL ^ ​​E_NOTICE). What does this mean? Below we analyze the error_reporting function in detail.

Definition Usage

error_reporting() Sets PHP’s error reporting level and returns the current level.

Syntax

error_reporting(report_level)

If the parameter report_level is not specified, the current error level will be returned. The following items are possible values ​​for report_level:

##ValueConstant Description1E_ERRORFatal runtime error. Unrecoverable error. Stop executing the script. 2E_WARNINGNon-fatal runtime error. The execution of the script does not stop. 4E_PARSECompile time error. 8E_NOTICERuntime reminder. 16E_CORE_ERRORFatal error when starting PHP. This is like an E_ERROR32E_CORE_WARNING in the PHP core, a non-fatal error when PHP starts. This is like an E_WARNING warning in PHP core64E_COMPILE_ERRORfatal compile-time error. This is like an E_ERROR128E_COMPILE_WARNING non-fatal compile-time error generated by the Zend Scripting Engine An E_WARNING warning256E_USER_ERRORUser-defined fatal error512E_USER_WARNINGUser-defined warning (non-fatal error)1024E_USER_NOTICEUser-defined warning Defined reminders (often bugs, may also be intentional)2048E_STRICTEncoding standardization warnings (suggestions on how to modify to move forward Compatible)4096E_RECOVERABLE_ERRORNear-fatal runtime error, if not caught it will be treated as E_ERROR8191E_ALLAll errors except E_STRICT##PHP does not enable errors by default, so you need to configure php.ini file:

Change display_errors = Off to display_errors = On

Also configure the error level, because PHP displays all errors by default, and some We don’t need harmless prompts, so the settings are as follows:

Change error_reporting = E_ALL to error_reporting = E_ALL & ~E_NOTICE

Example of use in PHP code:

Tip: Any number of the above options can be connected with "OR" (using OR or |), so that all required levels of errors can be reported. For example, the following code turns off user-defined errors and warnings, performs certain actions, and then returns to the original error level:

<?php
 
//禁用错误报告
 
error_reporting(0);
 
//报告运行时错误
 
error_reporting(E_ERROR | E_WARNING | E_PARSE);
 
//报告所有错误
 
error_reporting(E_ALL);
 
?>

To understand how the error_reporting function is used, look at the error_reporting(E_ALL ^ ​​E_NOTICE) code, which means to display all error information except E_NOTICE.

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