Take you to understand the usage of error_reporting function in PHP

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:

Value	Constant	Description
1	E_ERROR	Fatal runtime error. Unrecoverable error. Stop executing the script.
2	E_WARNING	Non-fatal runtime error. The execution of the script does not stop.
4	E_PARSE	Compile time error.
8	E_NOTICE	Runtime reminder.
16	E_CORE_ERROR	Fatal error when starting PHP. This is like an E_ERROR
32	E_CORE_WARNING	in the PHP core, a non-fatal error when PHP starts. This is like an E_WARNING warning in PHP core
64	E_COMPILE_ERROR	fatal compile-time error. This is like an E_ERROR
128	E_COMPILE_WARNING	non-fatal compile-time error generated by the Zend Scripting Engine An E_WARNING warning
256	E_USER_ERROR	User-defined fatal error
512	E_USER_WARNING	User-defined warning (non-fatal error)
1024	E_USER_NOTICE	User-defined warning Defined reminders (often bugs, may also be intentional)
2048	E_STRICT	Encoding standardization warnings (suggestions on how to modify to move forward Compatible)
4096	E_RECOVERABLE_ERROR	Near-fatal runtime error, if not caught it will be treated as E_ERROR
8191	E_ALL	All 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 operations, 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);
 
?>

Learn about error_reporting How to use the function, let's look at the error_reporting(E_ALL ^ ​​E_NOTICE) code, which means to display all error messages except E_NOTICE.

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