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ph二维数组排序难题，内附详细需求

时间：2021-07-01 10:21:17 帮助过：5人阅读

ph二维数组排序难题，请求帮助，内附详细需求
初始状态的二维数组是这样的

$a = array(
  array('name'=>'a','num'=>'1','parentNum'=>'0'),
  array('name'=>'b','num'=>'2','parentNum'=>'0'),
  array('name'=>'c','num'=>'3','parentNum'=>'0'),
  array('name'=>'d','num'=>'4','parentNum'=>'1'),
  array('name'=>'e','num'=>'5','parentNum'=>'2'),
  array('name'=>'f','num'=>'6','parentNum'=>'0'),
  array('name'=>'g','num'=>'7','parentNum'=>'0'),
)

默认按照name字段排序，但是现在需要改变
仍然按照name字段排序，但是同时也要按照parentNum字段排序，parentNum是代表它的父级分类，所以最终的结果应该是

  array('name'=>'a','num'=>'1','parentNum'=>'0'),
    array('name'=>'d','num'=>'4','parentNum'=>'1'),
  array('name'=>'b','num'=>'2','parentNum'=>'0'),
   array('name'=>'e','num'=>'5','parentNum'=>'2'),
  array('name'=>'c','num'=>'3','parentNum'=>'0'),
  array('name'=>'f','num'=>'6','parentNum'=>'0'),
  array('name'=>'g','num'=>'7','parentNum'=>'0'),

请问怎么用代码实现呢？我试了蛮久不怎么会？
------解决思路----------------------

$a = array(
  array('name'=>'a','num'=>'1','parentNum'=>'0'),
  array('name'=>'b','num'=>'2','parentNum'=>'0'),
  array('name'=>'c','num'=>'3','parentNum'=>'0'),
  array('name'=>'d','num'=>'4','parentNum'=>'1'),
  array('name'=>'e','num'=>'5','parentNum'=>'2'),
  array('name'=>'f','num'=>'6','parentNum'=>'0'),
  array('name'=>'g','num'=>'7','parentNum'=>'0'),
);

foreach($a as $r) {
  $p[] = $r['parentNum'] ? $r['parentNum'] : $r['num'];
}
array_multisort($p, $a);
print_r($a);

Array
(
    [0] => Array
        (
            [name] => a
            [num] => 1
            [parentNum] => 0
        )

    [1] => Array
        (
            [name] => d
            [num] => 4
            [parentNum] => 1
        )

    [2] => Array
        (
            [name] => b
            [num] => 2
            [parentNum] => 0
        )

    [3] => Array
        (
            [name] => e
            [num] => 5
            [parentNum] => 2
        )

    [4] => Array
        (
            [name] => c
            [num] => 3
            [parentNum] => 0
        )

    [5] => Array
        (
            [name] => f
            [num] => 6
            [parentNum] => 0
        )

    [6] => Array
        (
            [name] => g
            [num] => 7
            [parentNum] => 0
        )

)

ph二维数组排序难题，内附详细需求

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