PHP如何使用array_multisort函数对数组按指定字段排序

        $arr=['green','car','apple','book'];
        sort($arr);
        var_dump($arr);

array (size=4)
  0 => string 'apple' (length=5)
  1 => string 'book' (length=4)
  2 => string 'car' (length=3)
  3 => string 'green' (length=5)

        $arr=[
            [
                'age'=>50,
                'name'=>'张三'
            ],
            [
                'age'=>18,
                'name'=>'李四'
            ],
            [
                'age'=>27,
                'name'=>'王五'
            ]
        ];

 array_multisort(array_column($arr,'age'),SORT_ASC,$arr);
var_dump($arr);

array (size=3)
  0 => 
    array (size=2)
      'age' => int 18
      'name' => string '李四' (length=6)
  1 => 
    array (size=2)
      'age' => int 27
      'name' => string '王五' (length=6)
  2 => 
    array (size=2)
      'age' => int 50
      'name' => string '张三' (length=6)