3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php echo "<pre>"; print_r($SYSTEM);
Output for 5.0.4 - 7.1.0
<pre> Notice: Undefined variable: SYSTEM in /in/6ar4d on line 3
Output for 4.3.0 - 5.0.3
<pre> Notice: Undefined variable: SYSTEM in /in/6ar4d on line 3