3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = '<?php $a = %c%s%c; printf($a, 1, $a, 1);'; printf($a, 1, $a, 1); ?>
based on am7o7
Output for 5.6.0 - 7.3.0alpha1
<?php $a = <?php $a = %c%s%c; printf($a, 1, $a, 1);; printf($a, 1, $a, 1);