Take you to understand the use of error_reporting functions in PHP

This article mainly introduces the error_reporting function usage in PHP detailed introduction of relevant information, the need for friends can refer to the following

The error_reporting function usage in PHP is described in detail

PHP in the processing of errors will use the Error_reporting function, see the most is error_reporting (e_all ^ e_notice), what does this mean? Below we specifically analyze the error_reporting function.

Defining usage

Error_reporting () Sets the error level for PHP and returns the current level.

Grammar

Error_reporting (Report_level)

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

value	Constants	Description
1	E_error	Fatal run-time error. An unrecoverable error. Stops execution of the script.
2	E_warning	A non-fatal run-time error. The execution of the script does not stop.
4	E_parse	Compile-time error.
8	E_notice	Run-time reminders.
16	E_core_error	Fatal error during PHP startup. This is like a e_error in the PHP core
32	E_core_warning	Non-fatal error when PHP is started. This is like a e_warning warning in PHP core
64	E_compile_error	Fatal compile-time error. This is like a e_error generated by the Zend scripting engine
128	E_compile_warning	Non-fatal compile-time error, generated by the Zend scripting engine a 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 reminders (often bugs, may also be intentional)
2048	E_strict	Coding normalization Warning (recommended how to modify to forward compatible)
4096	E_recoverable_error	Near-fatal run-time errors, if not captured, are treated as E_error
8191	E_all	All errors except E_strict

PHP does not turn on the error by default, so you need to configure the php.ini file:

Change display_errors = Off to display_errors = On

Also configure the error level, because PHP defaults to show all errors, and some harmless hints we do not need, so set the following:

Change error_reporting = E_all to error_reporting = E_all & ~e_notice

Use the example in PHP code:

Tip: Any number of the above options can be used to connect (with OR or |) with or to report all required levels of errors. For example, the following code turns off user-defined errors and warnings, performs certain actions, and then reverts to the original error level:

<?php//Disable error Reporting error_reporting (0); Report run-time error error_reporting (E_error | e_warning | E_parse); Report all Errors error_reporting (E_all);?>

Learn how the Error_reporting function is used, and then look at the error_reporting (e_all ^ e_notice) code, which means that all error messages except E_notice are displayed.