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)-1;$i++,$j++){ // echo(" i: ".$i); $arr[$i]=$tmp0; $tmp0 = $arr[$i+1]; $i++; // echo(" tmp0: ".$tmp0); $arr[$i+1]=$tmp1; $tmp1 = $arr[$j+1]; // echo(" tmp1: ".$tmp1); // echo("\n"); printIt($arr); echo("\n\n"); } echo("\n"); function printIt($arr){ for($i=0;$i<count($arr);$i++){ echo($arr[$i]." "); } } ?>
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, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
1 2 a 4 5 6 7 8 9 10 a b c d e f g h i j 1 2 2 4 b 6 7 8 9 10 a b c d e f g h i j 1 2 2 4 4 6 c 8 9 10 a b c d e f g h i j 1 2 2 4 4 6 6 8 d 10 a b c d e f g h i j 1 2 2 4 4 6 6 8 8 10 e b c d e f g h i j 1 2 2 4 4 6 6 8 8 10 10 b f d e f g h i j 1 2 2 4 4 6 6 8 8 10 10 b b d g f g h i j 1 2 2 4 4 6 6 8 8 10 10 b b d d f h h i j 1 2 2 4 4 6 6 8 8 10 10 b b d d f f h i j 1 2 2 4 4 6 6 8 8 10 10 b b d d f f h h j j

preferences:
288.1 ms | 407 KiB | 456 Q