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<?php $groupByCols = ['a', 'b']; $rows = [ [ 'a' => 1, 'b' => 10, 'c' => 100 ], [ 'a' => 1, 'b' => 20, 'c' => 200 ], [ 'a' => 1, 'b' => 20, 'c' => 300 ], [ 'a' => 1, 'b' => 30, 'c' => 400 ], [ 'a' => 2, 'b' => 40, 'c' => 500 ], [ 'a' => 2, 'b' => 50, 'c' => 600 ], [ 'a' => 3, 'b' => 60, 'c' => 700 ] ]; function group_by($array, $columns) { $new_arr = array(); $column = array_shift($columns); foreach ($array as $arr) { $new_arr[$arr[$column]][] = $arr; } if (count($columns)) { foreach ($new_arr as &$arr) { $arr = group_by($arr, $columns); } } return array_values($new_arr); } print_r(group_by($rows, $groupByCols));