3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $str = "abcdefghijklmn"; $print = strrev($str); $st=""; for($i = 0;$i<$print.length;$i=$i+2) { if($i+1 < $print.length ) $st .= substr($print,$i,$i+1); echo $st; }
Output for 7.2.0 - 7.2.6
Warning: Use of undefined constant length - assumed 'length' (this will throw an Error in a future version of PHP) in /in/rWsMT on line 5
Output for 4.3.0 - 7.1.20
Notice: Use of undefined constant length - assumed 'length' in /in/rWsMT on line 5