3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $flag = 2; // true if ($flag) echo "I am true.\n"; $flag = 0; // false if (!$flag) echo "I am false.\n"; $flag = -1; if ($flag) { echo "Null is true.\n"; } if (!$flag) { echo "Null is false.\n"; }
based on v8cvb
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
I am true. I am false. Null is true.