使用max（）函数获取数组键

I'm using the max() function to find the largest value in an array. I need a way to return the key of that value. I've tried playing with the array_keys() function, but all I can get that to do is return the largest key of the array. There has to be a way to do this but the php manuals don't mention anything.

我正在使用max()函数来查找数组中的最大值。我需要一种方法来返回该值的键。我尝试过使用array_keys()函数,但我能做到的就是返回数组中最大的键。必须有一种方法来做到这一点,但PHP手册没有提到任何东西。

Here's a sample of the code I'm using:

这是我正在使用的代码示例:

$arrCompare = array('CompareOne' => $intOne,
                    'CompareTwo' => $intTwo,
                    'CompareThree' => $intThree,
                    'CompareFour' => $intfour);

$returnThis = max($arrCompare);

I can successfully get the highest value of the array, I just can't get the associated key. Any ideas?

我可以成功获得数组的最高值,我只是无法得到相关的密钥。有任何想法吗?

Edit: Just to clarify, using this will not work:

编辑:只是为了澄清,使用它将无法正常工作:

$max_key = max( array_keys( $array ) );

This compares the keys and does nothing with the values in the array.

这比较了键,并且对数组中的值没有任何作用。

3 个解决方案

#1

array_search function would help you.

array_search函数可以帮到你。

$returnThis = array_search(max($arrCompare),$arrCompare);

#2

If you need all keys for max value from the source array, you can do:

如果您需要源数组中所有键的最大值,您可以执行以下操作:

$keys = array_keys($array, max($array));

#3

Not a one-liner, but it will perform the required task.

不是单行,但它将执行所需的任务。

function max_key($array)
{
    $max = max($array);
    foreach ($array as $key => $val)
    {
        if ($val == $max) return $key;
    }
}

From http://cherryblossomweb.de/2010/09/26/getting-the-key-of-minimum-or-maximum-value-in-an-array-php/

#1