URL As Comments

<?php

http://www.example.com/foo
function foo($a) {
    // what does this do?
}

?>

The code below includes a raw URL in the code. PHP understand that code as a goto label, followed by a online comment starting with //. As such, the comment is valid, but cannot be repeated, as it would make a dual goto label, and PHP would raise an error.

See Also

• A URL is valid PHP code?!

• URL as comments [Try me]

PHP Features

• goto

• comment

• label

• identifier

• syntax

Last updated: 14 July 2026