How to modify the error level in php

Modification method: 1. In php.ini, find and modify the value of the "error_reporting" item, and then restart the web server. 2. In the PHP file, use the "error_reporting(level)" statement to modify. The parameter level is used to specify the error reporting level of the current script.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

Error reporting level: Specifies under what circumstances , errors in the script code (errors here are generalized errors, including E_NOTICE, E_WARNING, E_ERROR fatal errors, etc.) will be output in the form of an error report.

How to modify the error level in php

1. Modify the PHP configuration file php.ini

After setting error_reporting in this way, restart the web server and it will take effect permanently.

Taking the xampp integrated software package as an example, open the configuration file php.ini and check the default value of error reporting level error_reporting, as follows:

error_reporting=E_ALL & ~E_DEPRECATED & ~E_STRICT

means reporting all errors except E_DEPRECATED and E_STRICT.

Modify it to:

error_reporting=E_ALL &  ~E_NOTICE

It means reporting all errors except E_NOTICE. This is also the most commonly used error reporting level. It will not report errors of the attention class (such as using an undefined variable).

Save it and it will take effect after restarting the web server.

2. Use the error_reporting() function

After setting in this way, it can take effect immediately. But only in the area behind the error_reporting() function call in the current script.

error_reporting(level)

The level parameter specifies the error reporting level of the current script and can be omitted. Both value numbers and constant names are accepted, however, for compatibility with future PHP versions, it is recommended to use constant names.

The level parameter can be an integer or the corresponding constant identifier. It is recommended to use the constant form. The return value is the value (integer value) of the error reporting level in effect at the current location.

The following are some error reporting levels:

示例：

error_reporting(E_ALL ^ E_NOTICE);    // 除了E_NOTICE之外，报告所有的错误
error_reporting(E_ERROR);       // 只报告致命错误
echo error_reporting(E_ERROR | E_WARNING | E_NOTICE);   // 只报告E_ERROR、E_WARNING 和 E_NOTICE三种错误

注意：配置文件php.ini中display_errors的默认值为On，代表显示错误提示，如果设置为Off，就会关闭所有的错误提示。

使用 error_reporting(0) 或者在函数前面加 @，可以抑制错误输出，以防止错误消息泄露敏感信息。 

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