3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $mystring = null; $arr = get_defined_vars(); echo in_array('mystring',$arr);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0