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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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