3v4l.org

run code in 300+ PHP versions simultaneously
<?php $h_somevar = NULL; $h_othervar = 'hi there'; $h_anothervar = NULL; $hlist = array($h_somevar, $h_othervar, $h_anothervar); foreach($hlist as $hl) { if(!empty($hl)) { echo $hl; } }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.29 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
hi there
preferences:
200.09 ms | 406 KiB | 312 Q