1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57   $arr2[$j]) { $returnArr[] =$arr2[$j];$j++; } else { $returnArr[] =$arr1[$i];$i++; } } for($tmp =$i; $tmp <$arr1Length; $tmp++) {$returnArr[] = $arr1[$tmp]; } for($tmp =$j; $tmp <$arr2Length; $tmp++) {$returnArr[] = $arr2[$tmp]; } return $returnArr; }$arr = [1,3,2,5,7,9,3,1]; $sortableArr = sortArr($arr); foreach ($sortableArr as$a) { print_r(\$a . "\n"); }