3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php echo "foo {$_SERVER['QUERY_STRING']}";
Output for 5.3.0 - 7.2.0
Notice: Undefined index: QUERY_STRING in /in/g6iev on line 2 foo
Output for 4.3.0 - 5.2.17
Notice: Undefined index: QUERY_STRING in /in/g6iev on line 2 foo