PHP Quine

<?php
$code = '<?php
$code = %c%s%c;
printf($code, 39, $code, 39);';
printf($code, 39, $code, 39);

A quine is a piece of code that produces itself. It takes not input, and outputs a text that is its own code. The code is run to produce itself.

One may consider a file without PHP tags as a Quine: PHP executes such code by outputting the raw text. It is considered valid, yet too easy to be a quine.

See Also

• Quine (Computing)

• Quine Programs

• Quine in PHP [Try me]

PHP Features

• php

• quine

• folklore

Last updated: 14 July 2026