php多维数组排序方法思路，适用二维、三维、四维.....

最近须要作一个三维排序，查了一下网上，貌似没有一个比较万能的方法，因此就本身思考写了一下，分享一下~

主要依赖方法：array_multisort 方法文档：www.php.net/manual/zh/f…

方法以下

参数：第一个为要排序的数组，剩下是要排序的键（key），和排序方法，键的话由于要应对多维的状况，因此须要上下级链接，我这里采用"."链接，（multi_dimension_sort($arr, 'id', SORT_ASC, 'class.class_num', SORT_ASC, 'class.student.value', SORT_DESC)），参数可自行增减，具体看下面的例子

function multi_dimension_sort(...$args){
        $arr = array_shift($args); // 取到要排序的数组，剩下的为要排序的键和排序类型
        $sort_arg = [];
        foreach($args as $arg){
            // 这里主要是为了获得排序的key对应的值
            $sort = $arr;
            if(is_string($arg)){
                $arg = explode('.', $arg); // 我设定参数里面多维数组下的键，用‘.’链接下级的键，这里获得键，而后下面循环取得数组$arr里面该键对应的值
                foreach($arg as $key){
                    $sort = array_column($sort, $key); // 每次循环$sort的维度就会减一
                }
                $sort_arg[] = $sort;
            }else{
                $sort_arg[] = $arg; // 排序方法SORT_ASC、SORT_DESC等
            }
        }
        $sort_arg[] = &$arr; // 这个数组大体结构为：[$sort, SORT_ASC, $sort2, SORT_DESC,$arr]
        
        call_user_func_array('array_multisort', $sort_arg); // 由于参数不肯定数量，因此不能直接array_multisort($sort, SORT_ASC, $sort2, SORT_DESC,$arr)，用call_user_func_array执行
        
        return($arr);
    }复制代码

示例：构建一个由学院、班级、学生组成的多维数组，实现按照学院、班级、分数依次来排序

$arr = [
            [
                'id' => 2,
                'name' => '学院2',
                'class' => [
                    'class_num' => 2,
                    'student' => [
                        'student_id' => 5,
                        'value' => 20,
                    ]
                ],
            ],[
                'id' => 2,
                'name' => '学院2',
                'class' => [
                    'class_num' => 2,
                    'student' => [
                        'student_id' => 6,
                        'value' => 10,
                    ]
                ],
            ],[    
                'id' => 2,
                'name' => '学院2',
                'class' => [
                    'class_num' => 3,
                    'student' => [
                        'student_id' => 4,
                        'value' => 30,
                    ]
                ],
            ],[    
                'id' => 1,
                'name' => '学院1',
                'class' => [
                    'class_num' => 2,
                    'student' => [
                        'student_id' => 3,
                        'value' => 10,
                    ]
                ],
            ],[
                'id' => 1,
                'name' => '学院1',
                'class' => [
                    'class_num' => 2,
                    'student' => [
                        'student_id' => 4,
                        'value' => 5,
                    ]
                ],
            ],[
                'id' => 1,
                'name' => '学院1',
                'class' => [
                    'class_num' => 3,
                    'student' => [
                        'student_id' => 4,
                        'value' => 10,
                    ]
                ],
            ],[
                'id' => 2,
                'name' => '学院2',
                'class' => [
                    'class_num' => 2,
                    'student' => [
                        'student_id' => 7,
                        'value' => 20,
                    ]
                ],
            ],[
                'id' => 2,
                'name' => '学院2',
                'class' => [
                    'class_num' => 2,
                    'student' => [
                        'student_id' => 1,
                        'value' => 5,
                    ]
                ],
            ]
        ];

        dump(multi_dimension_sort($arr, 'id', SORT_ASC, 'class.class_num', SORT_ASC, 'class.student.value', SORT_DESC));复制代码

运行结果：

array:8 [
  0 => array:3 [
    "id" => 1
    "name" => "学院1"
    "class" => array:2 [
      "class_num" => 2
      "student" => array:2 [
        "student_id" => 3
        "value" => 10
      ]
    ]
  ]
  1 => array:3 [
    "id" => 1
    "name" => "学院1"
    "class" => array:2 [
      "class_num" => 2
      "student" => array:2 [
        "student_id" => 4
        "value" => 5
      ]
    ]
  ]
  2 => array:3 [
    "id" => 1
    "name" => "学院1"
    "class" => array:2 [
      "class_num" => 3
      "student" => array:2 [
        "student_id" => 4
        "value" => 10
      ]
    ]
  ]
  3 => array:3 [
    "id" => 2
    "name" => "学院2"
    "class" => array:2 [
      "class_num" => 2
      "student" => array:2 [
        "student_id" => 5
        "value" => 20
      ]
    ]
  ]
  4 => array:3 [
    "id" => 2
    "name" => "学院2"
    "class" => array:2 [
      "class_num" => 2
      "student" => array:2 [
        "student_id" => 7
        "value" => 20
      ]
    ]
  ]
  5 => array:3 [
    "id" => 2
    "name" => "学院2"
    "class" => array:2 [
      "class_num" => 2
      "student" => array:2 [
        "student_id" => 6
        "value" => 10
      ]
    ]
  ]
  6 => array:3 [
    "id" => 2
    "name" => "学院2"
    "class" => array:2 [
      "class_num" => 2
      "student" => array:2 [
        "student_id" => 1
        "value" => 5
      ]
    ]
  ]
  7 => array:3 [
    "id" => 2
    "name" => "学院2"
    "class" => array:2 [
      "class_num" => 3
      "student" => array:2 [
        "student_id" => 4
        "value" => 30
      ]
    ]
  ]
]复制代码

先写到这，有问题再论。

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