3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php strtoupper ( $string ); ?>
based on d4A6M
Output for 5.0.4 - 7.2.0
Notice: Undefined variable: string in /in/hRFt1 on line 2
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: string in /in/hRFt1 on line 2