Question

我正在处理php数组，但我有获取父数组索引的问题。在这里我想找到标题的父索引，所以我尝试通过循环查找它，但是如果标题是数组，我找不到索引。如果标题是数组，如何获取父索引

<?php
$Arr = [
    [
        "title" => ["news", "nasional", "internasional", "regional", "metropolitan", "sains", "pendidikan"],
        "url" => "AAA",
    ],
    [
        "title" => ["seleb", "news"],
        "url" => "BBB"
    ],
    [
        "title" => "travel",
        "url" => "CCC"
    ]
];


foreach($Arr as $value) {
$key = array_search("seleb", array_column($Arr , 'title'));
    echo $key; // should return index parent is [1]
}

?>

Answer 1

您正在传递整个数组，而不是传递循环的当前值

foreach ($Arr as $key => $value) {
    $keyChild='';
    $keyChild = array_search("seleb", $value);
    if ($keyChild != null && empty($keyChild)) {
        echo $key;
    }
}

Answer 2

尝试此操作以找到父索引

$Arr = [
        [
          "title" => ["news", "nasional", "internasional", "regional", "metropolitan", "sains", "pendidikan"],
          "url" => "AAA",
       ],
       [
         "title" => ["seleb", "news"],
         "url" => "BBB"
       ],
       [
         "title" => "travel",
         "url" => "CCC"
       ]
      ];

   foreach($Arr as $key => $value) {
     if(is_array($value['title'])){
        if(in_array("seleb", $value['title']))
           echo $key;
     }
   }

Answer 3

这是另一种做到这一点的方法，它减少了嵌套并增加了可重用性

<?php
$arr = [
    [
        "title" => ["news", "nasional", "internasional", "regional", "metropolitan", "sains", "pendidikan"],
        "url" => "AAA",
    ],
    [
        "title" => ["seleb", "news"],
        "url" => "BBB"
    ],
    [
        "title" => "travel",
        "url" => "CCC"
    ]
];

function findIndex($search, $array) {
    $found  = array_filter($array, function ($value) use ($search) {
        if (!is_array($value)) $value = [$value];
        return array_search($search, $value) !== false;
    });

    return key($found);
}

$titles = array_column($arr, 'title');
echo findIndex('seleb', $titles); // 1

findIndex将返回父索引或对是否找到结果进行加深处理的空值。

还有这部分：

$titles = array_column($arr, 'title');

可以将'title'作为另一个参数传递到函数中。

获取父级索引数组multydimension

3 个答案: