How to set error level in php.ini

How to set the error level in php.ini: Open the "php.ini" configuration file, find the "error_reporting" item, and set the value of the item to the required error type, such as "E_ALL & ~E_NOTICE" After that, restart the web server.

The operating environment of this tutorial: Windows 7 system, PHP version 7.1, DELL G3 computer

Many different levels of errors are defined in PHP. If an undefined variable is used, a notice-level error will be reported, and if an undefined class is instantiated, a fatal error-level error will be reported.

You can use error_reporting in the php.ini configuration file to define the error level, and you can also use error_reporting(E_ALL) in the code to define the error level.

How to set the error level in 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.

Set the value of error_reporting to the required error type. For example, 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.

The error types in PHP are as shown in the following table:

##ValueConstantDescription1E_ERRORFatal runtime error, usually an unrecoverable situation, such as problems caused by memory allocation, the consequences are Causes the script to terminate and not continue running. 2E_WARNINGRun-time warning (non-fatal error), only prompt information is given, but the script will not terminate the operation. 4E_PARSECompile-time syntax parsing error, generated only by the parser. 8E_NOTICERuntime notification, indicating that the script encounters a situation that may appear as an error, but in the script it can run normally There may also be similar notifications. 16E_CORE_ERRORA fatal error that occurs during PHP initialization startup, similar to E_ERROR, but generated by the PHP engine core. 32E_CORE_WARNINGWarning (non-fatal error) that occurs during PHP initialization startup, similar to E_WARNING, but generated by the PHP engine core of. 64E_COMPILE_ERRORFatal compile-time error, similar to E_ERROR, but generated by the Zend scripting engine. 128E_COMPILE_WARNINGCompile-time warning (non-fatal error), similar to E_WARNING, but generated by the Zend scripting engine. 256E_USER_ERRORThe error message generated by the user is similar to E_ERROR, but it is generated by the user using the PHP function trigger_error() in the code. produced. 512E_USER_WARNINGThe warning message generated by the user is similar to E_WARNING, but it is generated by the user himself using the PHP function trigger_error() in the code produced. 1024E_USER_NOTICEThe notification information generated by the user is similar to E_NOTICE, but it is generated by the user using the PHP function trigger_error() in the code. produced. 1024E_STRICTEnable PHP's suggestions for code modifications to ensure the best interoperability and forward compatibility of the code. 2048E_RECOVERABLE_ERRORA fatal error that can be caught, indicating that a potentially very dangerous error has occurred, but has not caused the PHP engine to be in Unstable state. If the error is not caught by a user-defined handler, it will become an E_ERROR, causing the script to terminate. 8192E_DEPRECATEDRuntime notification, when enabled, will give warnings about code that may not work properly in future versions. 16384E_USER_DEPRECATEDThe warning message generated by the user is similar to E_DEPRECATED, but it is generated by the user himself using the PHP function trigger_error() in the code produced. All error and warning messages except 30719E_ALLE_STRICT.

The values ​​(numeric or symbolic) in the table are used to create a binary bit mask to specify the error message to be reported. You can use bitwise operators to combine these values ​​or to mask certain types of errors.

Note that in php.ini, only '|', '~', '!', '^' and '&' will be parsed correctly.

In a formal environment, various unknown errors may occur. In this case, error_reporting(0) can be defined, so that errors can be shielded. Users will not see error messages on the page, and when troubleshooting errors , you can still look for relevant information in PHP's execution error log.

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