3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function is_set(& $v) { return $v !== null; } $var = '$var IS SET'; if(is_set($var)) { echo $var; } else { echo '$var is not set' ; }
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
$var IS SET