PHP Manual: Sets which PHP errors are reported

Description

int error_reporting(intnull $error_level = null)

The error_reporting function sets the error_reporting directive at runtime. PHP has many levels of errors, using this function sets that level for the duration (runtime) of your script. If the optional error_level is not set, error_reporting will just return the current error reporting level.

Parameters

error_level

The new error_reporting level. It takes on either a bitmask, or named constants. Using named constants is strongly encouraged to ensure compatibility for future versions. As error levels are added, the range of integers increases, so older integer-based error levels will not always behave as expected.

The available error level constants and the actual meanings of these error levels are described in the predefined constants.

Return Values

Returns the error_reporting level, before it is changed to error_level.

Note: The error control @-operator changes the error_level during error handling.

Changelog

Version	Description
8.0.0	`error_level` is nullable now.

Examples

Example #1 error_reporting examples

<?php

// Turn off all error reporting
error_reporting(0);

// Report simple running errors
error_reporting(E_ERROR | E_WARNING | E_PARSE);

// Reporting E_NOTICE can be good too (to report uninitialized
// variables or catch variable name misspellings ...)
error_reporting(E_ERROR | E_WARNING | E_PARSE | E_NOTICE);

// Report all errors except E_NOTICE
error_reporting(E_ALL & ~E_NOTICE);

// Report all PHP errors
error_reporting(E_ALL);

// Report all PHP errors
error_reporting(-1);

// Same as error_reporting(E_ALL);
ini_set('error_reporting', E_ALL);

?>

Notes

Tip

Passing in the value -1 will show every possible error, even when new levels and constants are added in future PHP versions. The behavior is equivalent to passing E_ALL constant.