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PHP error_reporting() Function Usage and Examples

The error_reporting() function sets which PHP errors should be reported

Syntax

int error_reporting([int $level]);

Definition and usage

The error_reporting() function can set the error_reporting directive at runtime. PHP has many error levels, and this function can set the level at runtime. If the optional parameter level is not set, error_reporting() will only return the current error reporting level.

Parameter

Number	Parameters and descriptions
1	level(可选) It specifies the error reporting level of the current script. Accepts numeric values and constant names.

Report level

Value	Constant	Description
1	E_ERROR	Fatal errors at runtime. Unrepairable errors. The script execution stops.
2	E_WARNING	Non-fatal errors at runtime. The script did not stop executing.
4	E_PARSE	Parsing errors during compilation. Parsing errors should only be generated by the parser.
8	E_NOTICE	Notifications at runtime. The script found something that might be an error, but it could also occur during normal script execution.
16	E_CORE_ERROR	Fatal errors at PHP startup. This is similar to E_ERROR in PHP core.
32	E_CORE_WARNING	Non-fatal errors at PHP startup. This is similar to E_WARNING in PHP core.
64	E_COMPILE_ERROR	A fatal error during compilation. This is similar to E_ERROR generated by the Zend script engine.
128	E_COMPILE_WARNING	Compile-time non-fatal errors. This is like an E_WARNING generated by the Zend script engine.
256	E_USER_ERROR	User-generated fatal errors. This is like an E_ERROR generated by a programmer using the PHP function trigger_error().
512	E_USER_WARNING	User-generated non-fatal errors. This is like an E_WARNING generated by a programmer using the PHP function trigger_error().
1024	E_USER_NOTICE	User-generated notices. This is like an E_NOTICE generated by a programmer using the PHP function trigger_error().
2048	E_STRICT	Run-time notices. PHP recommends that you change the code to improve interoperability and compatibility.
4096	E_RECOVERABLE_ERROR	Catchable fatal errors. This is like an E_ERROR that can be caught by a user-defined handler (see set_error_handler()).
8191	E_ALL	All error and warning levels, except E_STRICT (since PHP 6.0 onwards, E_STRICT will be part of E_ALL).

Return value

　Returns the old error_reporting level, or the current level if no level parameter is given.

Online example

The following is the usage of the error_reporting function-

Example

<?php
//　Turns off all PHP error reporting
error_reporting(0);
//　Reports simple runtime errors
error_reporting(E_ERROR | E_WARNING | E_PARSE);
//　Reporting E_NOTICE is also good (reports uninitialized variables)
//　Or catch variable name spelling errors)
error_reporting(E_ERROR | E_WARNING | E_PARSE | E_NOTICE);
//　Reports all errors except E_NOTICE
error_reporting(E_ALL ^ E_NOTICE);
//　Reports all PHP errors (see changelog)
error_reporting(E_ALL);
//　Reports all PHP errors
error_reporting(-1);
//　It is the same as error_reporting(E_ALL);
ini_set('error_reporting', E_ALL);
?>

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