3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?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+1]; } for($i=0;$i<count($arr);$i++){ echo($arr[$i]." "); } ?>
Output for 5.3.0 - 5.6.28, 7.0.0 - 7.1.0
Notice: Undefined offset: 20 in /in/tn21N on line 11 1 a 2 b 4 c 6 d 8 e 10 f b g d h f i h j
Output for hhvm-3.10.0 - 3.12.0
Notice: Undefined index: 20 in /in/tn21N on line 11 1 a 2 b 4 c 6 d 8 e 10 f b g d h f i h j
Output for 4.3.0 - 5.2.17
Notice: Undefined offset: 20 in /in/tn21N on line 11 1 a 2 b 4 c 6 d 8 e 10 f b g d h f i h j