PHP多维数组按值搜索 [英] PHP multidimensional array search by value

问题描述

我有一个数组，我想在其中搜索uid并获取该数组的键.

I have an array where I want to search the uid and get the key of the array.

假设我们有以下二维数组:

Assume we have the following 2-dimensional array:

$userdb = array(
    array(
        'uid' => '100',
        'name' => 'Sandra Shush',
        'pic_square' => 'urlof100'
    ),
    array(
        'uid' => '5465',
        'name' => 'Stefanie Mcmohn',
        'pic_square' => 'urlof100'
    ),
    array(
        'uid' => '40489',
        'name' => 'Michael',
        'pic_square' => 'urlof40489'
    )
);

函数调用search_by_uid(100)(第一个用户的uid)应返回0.

The function call search_by_uid(100) (uid of first user) should return 0.

函数调用search_by_uid(40489)应该返回2.

我尝试进行循环，但是我想要更快的执行代码.

I tried making loops, but I want a faster executing code.

推荐答案

function searchForId($id, $array) {
   foreach ($array as $key => $val) {
       if ($val['uid'] === $id) {
           return $key;
       }
   }
   return null;
}

这将起作用.您应该这样称呼它:

This will work. You should call it like this:

$id = searchForId('100', $userdb);

重要的是要知道，如果您使用的是===运算符，则比较类型必须完全相同，在此示例中，您必须搜索string或仅使用==代替===.

It is important to know that if you are using === operator compared types have to be exactly same, in this example you have to search string or just use == instead ===.

基于 angoru 答案.在更高版本的PHP(>= 5.5.0)中，您可以使用单线.

Based on angoru answer. In later versions of PHP (>= 5.5.0) you can use one-liner.

$key = array_search('100', array_column($userdb, 'uid'));

这里是文档: http://php.net/manual/zh/function.array-column.php .

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