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# trigger_error

(PHP 4 >= 4.0.1, PHP 5)

trigger_error -- Generates a user-level error/warning/notice message

## 说明

bool trigger_error ( string error_msg [, int error_type] )

Used to trigger a user error condition, it can be used by in conjunction with the built-in error handler, or with a user defined function that has been set as the new error handler (set_error_handler()).

This function is useful when you need to generate a particular response to an exception at runtime.

## 参数

error_msg

  The designated error message for this error. It's limited to 1024 characters in length. Any additional characters beyond 1024 will be truncated.

error_type

  The designated error type for this error. It only works with the E_USER family of constants, and will default to `E_USER_NOTICE`.

## 返回值

This function returns `FALSE` if wrong error_type is specified, `TRUE` otherwise.

## 范例

例子 1. trigger_error() example

See set_error_handler() for a more extensive example.

`<?php if (assert($divisor == 0)) { trigger_error("Cannot divide by zero", E_USER_ERROR); } ?>`

## 参见

error_reporting()
set_error_handler()
restore_error_handler()
The error level constants

后退 | 起点 | 前进
set_exception_handler | 上一级 | user_error