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# error_reporting

(PHP 3, PHP 4, PHP 5)

error_reporting -- Sets which PHP errors are reported

## 说明

int error_reporting ( [int level] )

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.

## 参数

`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 are listed below. The actual meanings of these error levels are described in the predefined constants.

  表 1. error_reporting() level constants and bit values

  value | constant
  --- | ---
  1 | E_ERROR
  2 | E_WARNING
  4 | E_PARSE
  8 | E_NOTICE
  16 | E_CORE_ERROR
  32 | E_CORE_WARNING
  64 | E_COMPILE_ERROR
  128 | E_COMPILE_WARNING
  256 | E_USER_ERROR
  512 | E_USER_WARNING
  1024 | E_USER_NOTICE
  6143 | E_ALL
  2048 | E_STRICT
  4096 | E_RECOVERABLE_ERROR

## 返回值

Returns the old error_reporting level.

## 更新日志

版本 | 说明
--- | ---
5.0.0 | `E_STRICT` introduced (not part of `E_ALL`).
5.2.0 | `E_RECOVERABLE_ERROR` introduced.
6 | `E_STRICT` became part of `E_ALL`.

## 范例

例 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
// This is the default value set in php.ini
error_reporting(E_ALL ^ E_NOTICE);
// Report all PHP errors (bitwise 63 may be used in PHP 3)
error_reporting(E_ALL);
// Same as error_reporting(E_ALL);
ini_set('error_reporting', E_ALL);
?>`

## 注释

警告
Most of `E_STRICT` errors are evaluated at the compile time thus such errors are not reported in the file where error_reporting is enhanced to include `E_STRICT` errors (and vice versa).

## 参见

The display_errors directive
ini_set()

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