Question

我在使用Key对数组进行分组时遇到问题：- 我有一个php数组，里面有以下元素。

$array = array(
    '0' => array ( 'id' => 'food,Travel', 'names' => 'chimpanzee' ),
    '1' => array ( 'id' => 'food', 'name' => 'meeting' ),
    '2' => array ( 'id' => 'Z1', 'name' => 'dynasty' ),
    '3' => array ( 'id' => 'X', 'name' => 'chocolate' ),
    '4' => array ( 'id' => 'Travel', 'name' => 'bananas' ),
    '5' => array ( 'id' => 'Travel', 'name' => 'fantasy' ),
    '6' => array ( 'id' => 'Travel', 'name' => 'football' )
);

当我尝试以下代码时：-

$newarray= array();
foreach($array as $key => $value){
    $newarray[$value['id']][$key] = $value;
}

我得到的结果均低于数组此处食物，旅行创建了另一个数组，但我想取悦于相应类别的“食物去食物”和“旅行去旅行”

 (
    [food,Travel] => Array
        (
            [0] => Array
                (
                    [id] => food,Travel
                    [names] => chimpanzee
                )

        )

    [food] => Array
        (

[1] => Array

                    [id] => food,Travel
                    [names] => chimpanzee
                )  
(
                    [id] => food
                    [name] => meeting
                )


        )

    [Z1] => Array
        (
            [2] => Array
                (
                    [id] => Z1
                    [name] => dynasty
                )

        )

    [X] => Array
        (
            [3] => Array
                (
                    [id] => X
                    [name] => chocolate
                )

        )

    [Travel] => Array
        (
            [4] => Array
                (
                    [id] => Travel
                    [name] => bananas
                )

            [5] => Array
                (
                    [id] => Travel
                    [name] => fantasy
                )

            [6] => Array
                (
                    [id] => Travel
                    [name] => football
                )

        )

)

但是我想得到以下结果：-食物应该转到食物类别，而旅行应该转到旅行类别，例如：-

Array
(
    [food] => Array

    (
            // Food should come at food category 
            [0] => Array
                (
                    [id] => food
                    [names] => chimpanzee
                )

        )

        (
            [1] => Array
                (
                    [id] => food
                    [name] => meeting
                )

        )

    [Z1] => Array
        (
            [2] => Array
                (
                    [id] => Z1
                    [name] => dynasty
                )

        )

    [X] => Array
        (
            [3] => Array
                (
                    [id] => X
                    [name] => chocolate
                )

        )

    [Travel] => Array
        (
            ( // Travel should come at travel category
            [0] => Array
                (
                    [id] => food
                    [names] => chimpanzee
                )

            )
            [4] => Array
                (
                    [id] => Travel
                    [name] => bananas
                )

            [5] => Array
                (
                    [id] => Travel
                    [name] => fantasy
                )

            [6] => Array
                (
                    [id] => Travel
                    [name] => football
                )

        )

)

Answer 1

仅应将值添加到数组中。无需指定$ key

$newarray= [];

foreach($array as $key => $value){
    $newarray[$value['id']][] = array_values($value);
}

Answer 2

当id有,时，只需explode，检查demo

$result = [];
foreach($array as $k => $v){
    if(strpos($v["id"],",")) {
        $ids = explode(",", $v["id"]);
        foreach ($ids as $id) {
            $result[$id][$k] = $v;
        }
    }else{
        $result[$v["id"]][$k] = $v;
    }
}
var_dump($result);

Answer 3

不需要像某些人建议的那样使其复杂，请使用explode()

https://3v4l.org/jVK6j

$newarray= [];

foreach($array as $key => $value) {

    if(is_array(explode(",", $value["id"]))) {
        foreach(explode(",", $value["id"]) as $category) {
            $newarray[$category][$key] = $value;
            $newarray[$category][$key]["id"] = $category;
        }
    } else {
        $newarray[$value["id"]][$key] = $value;
    }

}

var_dump($newarray);

您甚至可以删除$key，因为它们会自动递增。

foreach($array as $value) {

    if(is_array(explode(",", $value["id"]))) {
        foreach(explode(",", $value["id"]) as $category) {
            $value["id"] = $category;
            $newarray[$category][] = $value;
        }
    } else {
        $newarray[$value["id"]][] = $value;
    }

}

按类别分组数组

3 个答案: