No Rewrite For Exit

<?php

namespace A;

use function foo as exit;

function foo() {
    print "FOO!
";
    exit();
}

Since PHP 8.4, exit() is also a function, and may be called as such.

Yet, it is still a PHP keyword, so it cannot be used as a function name: this would allow creating functions with that name in namespaces. On the other hand, it is possible to use that name as a method name.

And it is also not possible to use exit in a use command: that would allow rewriting exit with another function.

See Also

• exit (PHP manual)

• No use for exit [Try me]

PHP Error Messages

• syntax error, unexpected token “exit”, expecting identifier

PHP Features

• exit

• use

• relaxed-syntax

Last updated: 14 July 2026