3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php echo is_null($x); echo $x == null; echo empty($x); echo '<HR>',(bool) !$x;
Output for 5.0.4 - 7.1.0
Notice: Undefined variable: x in /in/pcb5P on line 2 1 Notice: Undefined variable: x in /in/pcb5P on line 3 11<HR> Notice: Undefined variable: x in /in/pcb5P on line 5 1
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: x in /in/pcb5P on line 2 1 Notice: Undefined variable: x in /in/pcb5P on line 3 11<HR> Notice: Undefined variable: x in /in/pcb5P on line 5 1