3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = array(1,2,3,4,5,6,7,8,9,10,'a','b','c','d','e','f','g','h','i','j'); $tmp0 = $arr[0]; $tmp1 = $arr[10]; $n=10; for($i=0,$j=n;$i<count($arr);$i+=2,$j++){ $arr[$i]=$tmp0; $tmp0 = $arr[$i+1]; $arr[$i+1]=$tmp1; $tmp1 = $arr[$j]; } for($i=0;$i<count($arr);$i++){ echo($arr[$i]." "); } ?>
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 "n" in /in/QvI1I:7 Stack trace: #0 {main} thrown in /in/QvI1I on line 7
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
Warning: Use of undefined constant n - assumed 'n' (this will throw an Error in a future version of PHP) in /in/QvI1I on line 7 Notice: Undefined index: n in /in/QvI1I on line 11 Notice: Undefined index: o in /in/QvI1I on line 11 Notice: Undefined index: p in /in/QvI1I on line 11 Notice: Undefined index: q in /in/QvI1I on line 11 Notice: Undefined index: r in /in/QvI1I on line 11 Notice: Undefined index: s in /in/QvI1I on line 11 Notice: Undefined index: t in /in/QvI1I on line 11 Notice: Undefined index: u in /in/QvI1I on line 11 Notice: Undefined index: v in /in/QvI1I on line 11 Notice: Undefined index: w in /in/QvI1I on line 11 1 a 2 4 6 8 10 b d f h
Output for 7.3.32 - 7.3.33
Warning: Use of undefined constant n - assumed 'n' (this will throw an Error in a future version of PHP) in /in/QvI1I on line 7 1 a 2 4 6 8 10 b d f h
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.25
Notice: Use of undefined constant n - assumed 'n' in /in/QvI1I on line 7 Notice: Undefined index: n in /in/QvI1I on line 11 Notice: Undefined index: o in /in/QvI1I on line 11 Notice: Undefined index: p in /in/QvI1I on line 11 Notice: Undefined index: q in /in/QvI1I on line 11 Notice: Undefined index: r in /in/QvI1I on line 11 Notice: Undefined index: s in /in/QvI1I on line 11 Notice: Undefined index: t in /in/QvI1I on line 11 Notice: Undefined index: u in /in/QvI1I on line 11 Notice: Undefined index: v in /in/QvI1I on line 11 Notice: Undefined index: w in /in/QvI1I on line 11 1 a 2 4 6 8 10 b d f h
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
Notice: Use of undefined constant n - assumed 'n' in /in/QvI1I on line 7 Notice: Undefined index: n in /in/QvI1I on line 11 Notice: Undefined index: o in /in/QvI1I on line 11 Notice: Undefined index: p in /in/QvI1I on line 11 Notice: Undefined index: q in /in/QvI1I on line 11 Notice: Undefined index: r in /in/QvI1I on line 11 Notice: Undefined index: s in /in/QvI1I on line 11 Notice: Undefined index: t in /in/QvI1I on line 11 Notice: Undefined index: u in /in/QvI1I on line 11 Notice: Undefined index: v in /in/QvI1I on line 11 Notice: Undefined index: w in /in/QvI1I on line 11 1 a 2 4 6 8 10 b d f h
preferences:
246.29 ms | 404 KiB | 424 Q