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)-2;$i+=2,$j++){ echo(" i: ".$i); $arr[$i]=$tmp0; $tmp0 = $arr[$i+1]; echo(" tmp0: ".$tmp0); $arr[$i+1]=$tmp1; $tmp1 = $arr[$j+1]; echo(" tmp1: ".$tmp1); echo("\n"); printIt($arr); echo("\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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
i: 0 tmp0: 2 tmp1: b 1 a 3 4 5 6 7 8 9 10 a b c d e f g h i j i: 2 tmp0: 4 tmp1: c 1 a 2 b 5 6 7 8 9 10 a b c d e f g h i j i: 4 tmp0: 6 tmp1: d 1 a 2 b 4 c 7 8 9 10 a b c d e f g h i j i: 6 tmp0: 8 tmp1: e 1 a 2 b 4 c 6 d 9 10 a b c d e f g h i j i: 8 tmp0: 10 tmp1: f 1 a 2 b 4 c 6 d 8 e a b c d e f g h i j i: 10 tmp0: b tmp1: g 1 a 2 b 4 c 6 d 8 e 10 f c d e f g h i j i: 12 tmp0: d tmp1: h 1 a 2 b 4 c 6 d 8 e 10 f b g e f g h i j i: 14 tmp0: f tmp1: i 1 a 2 b 4 c 6 d 8 e 10 f b g d h g h i j i: 16 tmp0: h tmp1: j 1 a 2 b 4 c 6 d 8 e 10 f b g d h f i i j
preferences:
344.27 ms | 407 KiB | 460 Q