Php 如何从关联数组中的数组数据值生成数组键

我有一个多维关联数组，它有一组数组。我想从某个数组值更改数组索引值

我已经尝试了一些数组函数，但是我的数组也包含一些空数组，所以laravel函数keyBy没有给我想要的结果

$arr1=array(0 =>array(),1=>array(0=>array('quan'=>10,'handle' => 'baroque'),1 =>array('quan'=>20,'handle' => 'baroque')),
    2 =>array (0 =>array('quan' => 5,'handle' => 'adidas')));

我的预期结果数组必须如下所示

$arr2=array(0 =>array(),'baroque'=>array(0=>array('quan'=>10,'handle' => 'baroque'),1 =>array('quan'=>20,'handle' => 'baroque')),
    'adidas' =>array (0 =>array('quan' => 5,'handle' => 'adidas')));

---

您可以使用经典的

foreach

。使用

isset

检查元素0上的句柄是否存在，如果存在，则将其用作键

$arr1 = //...
$result = array();
foreach($arr1 as $key => $val) {
    if (is_array($val) && isset($val[0]["handle"])) $result[ $val[0]["handle"] ] = $val;
    else  $result[$key] = $val;
}

$result

将是：

Array
(
    [0] => Array
        (
        )

    [baroque] => Array
        (
            [0] => Array
                (
                    [quan] => 10
                    [handle] => baroque
                )

            [1] => Array
                (
                    [quan] => 20
                    [handle] => baroque
                )

        )

    [adidas] => Array
        (
            [0] => Array
                (
                    [quan] => 5
                    [handle] => adidas
                )

        )

)

---

通过直接在

句柄

处分组为键，可以无条件使用

$result = [];
foreach ($arr as $key => $value) {
    if (!empty($value)) {
        foreach ($value as $key1 => $value1) {
            $result[$value1['handle']][] = $value1;
        }
    } else {
        $result[] = $value;
    }
}

输出：-

Array
(
    [0] => Array
        (
        )

    [baroque] => Array
        (
            [0] => Array
                (
                    [quan] => 10
                    [handle] => baroque
                )

            [1] => Array
                (
                    [quan] => 20
                    [handle] => baroque
                )

        )

    [adidas] => Array
        (
            [0] => Array
                (
                    [quan] => 5
                    [handle] => adidas
                )

        )

)

试试这个

$res = [];
foreach($x as $key => $value)
{
  if(empty($value))
  {
    $res[] = $value;
  }
  else
  {
    foreach($value as $v => $k)
    {
        if(array_key_exists($k['handle'],$res))
        {
            $res[$k['handle']][] = ['quan' => $k['quan'],'handle' => $k['handle']];
        }
        else
        {
            $res[$k['handle']][0] = ['quan' => $k['quan'],'handle' => $k['handle']];
        }
    }
  }

}

结果是这样的

 Array
(
[0] => Array
    (
    )

[baroque] => Array
    (
        [0] => Array
            (
                [quan] => 10
                [handle] => baroque
            )

        [1] => Array
            (
                [quan] => 20
                [handle] => baroque
            )

    )

[adidas] => Array
    (
        [0] => Array
            (
                [quan] => 5
                [handle] => adidas
            )

    )

)

---

您忘记发布您的代码测试使用laravel收集函数groupBy

$collection\u grouped=collect（$arr1）$collection=$collection->groupBy（函数（$item，$key）{$item->quan}）->values（）->all（）