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 <?php function sortArr($arr) { if (count($arr) < 2) { return $arr; } $mid = count($arr) / 2; $arr1 = array_slice($arr, 0, $mid); $arr2 = array_slice($arr, $mid, count($arr)); $arr1 = sortArr($arr1); $arr2 = sortArr($arr2); return mergeArr($arr1, $arr2); } function mergeArr($arr1, $arr2) { if (!is_array($arr1)) { $arr1[] = $arr1; } if (!is_array($arr2)) { $arr2[] = $arr2; } $i =0; $j = 0; $arr1Length = count($arr1); $arr2Length = count($arr2); $returnArr = []; while($i < $arr1Length && $j < $arr2Length) { if($arr1[$i] > $arr2[$j]) { $returnArr[] =……

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