3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php function ob_callback($str) { return "Modified: " . $str; } ob_start('ob_callback', 2); echo "Hello world";
Output for 4.3.2 - 7.1.10
Modified: Hello worldModified:
Output for 4.3.0 - 4.3.1
Hello world