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# exit

(PHP 3, PHP 4, PHP 5)

exit -- Output a message and terminate the current script

## 说明

void exit ( [string status] )
void exit ( int status )

Terminates execution of the script.

## 参数

`status`

  If `status` is a string, this function prints the `status`, if set as a string just before exiting.

  If `status` is an integer, that value will also be used as the exit status. Exit statuses should be in the range 0 to 254, the exit status 255 is reserved by PHP and shall not be used. The status 0 is used to terminate the program successfully.

  > 注意: PHP >= 4.2.0 does NOT print the `status` if it is an integer.

## 返回值

无返回值。

## 范例

例 1. exit() example

`<?php $filename = '/path/to/data-file'; $file = fopen($filename, 'r') or exit("unable to open file ($filename)"); ?>`

例 2. exit() status example

`<?php //exit program normally exit; exit(); exit(0); //exit with an error code exit(1); exit(0376); //octal ?>`

## 注释

> 注意: 由于这是一个语言结构而非函数，因此它无法被变量函数调用。

> 注意: This language construct is equivalent to die().

## 参见

register_shutdown_function()

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