3v4l.org

run code in 300+ PHP versions simultaneously
<?php $str = "abcdefghijklmn"; $print = strrev($str); $st=""; $size = strlen($print); for($i = 0;$i<size;$i=$i+2) { if($i+1 < $size ) $st .= substr($print,$i,$i); echo $st; }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught Error: Undefined constant "size" in /in/1GFlc:6 Stack trace: #0 {main} thrown in /in/1GFlc on line 6
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: Use of undefined constant size - assumed 'size' (this will throw an Error in a future version of PHP) in /in/1GFlc on line 6
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 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33
Notice: Use of undefined constant size - assumed 'size' in /in/1GFlc on line 6
preferences:
272.63 ms | 404 KiB | 460 Q