3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr1 = [343,353,353,646,757,8]; $arr2 = [35,353,646,75,23,23]; $count = max(count($arr1), count($arr2)); for($i = 0; $i< $count; $i++){ echo $arr1[$i] . "\n"; echo $arr2[$i] . "\n\n"; }

preferences:
53.56 ms | 402 KiB | 5 Q