3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = ''; $b = NULL; $c = ' '; echo isset($a); echo "\r\n"; echo isset($b); echo "\r\n"; echo isset($c); echo "\r\n"; echo isset($d); echo "\r\n"; echo '--------------------------------------'; echo "\r\n"; echo empty($a); echo "\r\n"; echo empty($b); echo "\r\n"; echo empty($c); echo "\r\n"; echo empty($d); echo "\r\n";
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
1 1 -------------------------------------- 1 1 1