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This article mainly introduces the usage of error_reporting functions in PHP. For more information about error_reporting functions in PHP, see the following article, for more information, see

Error_reporting function usage in PHP

The error_reporting function is used to handle errors in PHP. The most common error is error_reporting (E_ALL ^ E_NOTICE). What does this mean? The following describes the error_reporting function.

Define usage

Error_reporting () sets the PHP error level and returns the current level.

Syntax

error_reporting(report_level)

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

Value	Constant	Description
1	E_ERROR	Fatal runtime error. Unrecoverable errors. Stop the script execution.
2	E_WARNING	Non-fatal runtime error. Script execution is not stopped.
4	E_PARSE	Compilation error.
8	E_NOTICE	Runtime reminder.
16	E_CORE_ERROR	A fatal error during PHP startup. This is like an E_ERROR at the PHP core.
32	E_CORE_WARNING	Non-fatal errors during PHP startup. This is like a warning on PHP core E_WARNING.
64	E_COMPILE_ERROR	Fatal compile-time error. This is like an E_ERROR generated by the Zend script engine.
128	E_COMPILE_WARNING	Non-fatal compile-time error. The Zend script engine generates 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 notifications (often bugs, or intentionally)
2048	E_STRICT	Code Standardization warning (how to modify to forward compatibility)
4096	E_RECOVERABLE_ERROR	Near fatal runtime error. if not captured, it is considered as E_ERROR.
8191	E_ALL	All errors except E_STRICT

PHP does not enable errors by default, so you need to configure the php. ini file:

Change display_errors = Off to display_errors = On.

In addition, you need to configure the error level. because PHP displays all errors by default, and some harmless prompts are not required, the settings are as follows:

Change error_reporting = E_ALL to error_reporting = E_ALL &~ E_NOTICE

Example of using PHP code:

Tip: any number of the above options can be connected with "OR" (OR |), so that all the required levels of errors can be reported. For example, the following code disables user-defined errors and warnings, performs some operations, and then restores to the original error level:

To learn how the error_reporting function is used, read the error_reporting (E_ALL ^ E_NOTICE) code, which means to display all error messages except E_NOTICE.

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