递归array_search?

时间:2019-07-14 16:54:53

标签: php arrays

我有以下数组:

(
    [https://i.imgur.com/vyGHgZN.jpg] => dummy2
    [https://i.imgur.com/UYK4Agz.png] => dummy
    [https://i.imgur.com/xEXdKYn.jpg] => dummy
)

[key]是图片链接,=> dummy2是我网站上的图片位置。

使用以下功能,我删除了所有链接和重复项。

$unique=array_unique(array_values($img_array));

哪个返回以下数组:

(
    [0] => dummy2
    [1] => dummy
)

现在,我想生成以下数组:

(
    [dummy]
    (
       [0] => https://i.imgur.com/UYK4Agz.png
       [1] => https://i.imgur.com/xEXdKYn.jpg
    )

    [dummy2]
    (
       [0] => https://i.imgur.com/vyGHgZN.jpg
    )
)

因此,我使用以下函数来获取每个类别的链接:

foreach($unique as $value){
    print_r(array_search($value,$img_array));
}

哪个返回以下内容:

https://i.imgur.com/vyGHgZN.jpghttps://i.imgur.com/vyGHgZN.jpg

但是您可以看到,它缺少一个链接... array_search似乎不是递归的!

尝试了许多许多函数,这些函数显然是递归的,但就我而言,它们都不返回任何值。

有什么想法吗?

2 个答案:

答案 0 :(得分:2)

只需循环数组,然后将键值和值设为键:

$arr = array(
    "https://i.imgur.com/vyGHgZN.jpg" => "dummy2",
    "https://i.imgur.com/UYK4Agz.png" => "dummy",
    "https://i.imgur.com/xEXdKYn.jpg" => "dummy"
);

foreach($arr as $key => $val){
    $res[$val][] = $key;
}

var_dump($res);

输出:

array(2) {
  ["dummy2"]=>
  array(1) {
    [0]=>
    string(31) "https://i.imgur.com/vyGHgZN.jpg"
  }
  ["dummy"]=>
  array(2) {
    [0]=>
    string(31) "https://i.imgur.com/UYK4Agz.png"
    [1]=>
    string(31) "https://i.imgur.com/xEXdKYn.jpg"
  }
}

https://3v4l.org/0E9Vm

答案 1 :(得分:1)

简单的foreach循环就可以了,

$result = [];
foreach ($arr as $key => $value) {
    $result[$value][] = $key; // grouping array as per value as key
}
print_r($result);

Demo

输出:-

Array
(
    [dummy2] => Array
        (
            [0] => https://i.imgur.com/vyGHgZN.jpg
        )

    [dummy] => Array
        (
            [0] => https://i.imgur.com/UYK4Agz.png
            [1] => https://i.imgur.com/xEXdKYn.jpg
        )

)