`ksort` 按照ACSII码排序 ~~~ $arr = ['a','d','c','f']; ksort($arr); $arr1 = ['b' => '张三','afc' => '科比']; ksort($arr1); ~~~   ***** `array_multisort` 二维数组根据键排序 ~~~ $array[] = ['age' => 20,'name' => 'a']; $array[] = ['age' => 18,'name' => 'b']; $array[] = ['age' => 21,'name' => 'c']; $array[] = ['age' => 22,'name' => 'd']; foreach($array as $value){ $age[] = $value['age']; $name[] = $value['name']; } array_multisort($name,SORT_DESC,SORT_STRING,$array); return json($array); ~~~  *****