3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array1 = array("1","2","3","4",""); $array2 = array("1","1","3","4","5"); foreach($array1 as $k=>$v){ foreach($array2 as $i => $o){ if($v!=$o){ echo $v.'<br/>'; } } }
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, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.6 - 7.2.33, 7.3.16 - 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
1<br/>1<br/>1<br/>2<br/>2<br/>2<br/>2<br/>2<br/>3<br/>3<br/>3<br/>3<br/>4<br/>4<br/>4<br/>4<br/><br/><br/><br/><br/><br/>
preferences:
241.66 ms | 406 KiB | 354 Q