关联数组的最高值

Question

有没有简单的方法来获得关联数组的最高数值？

$array = array(
    0 => array(
        'key1' => '123',
        'key2' => 'values we',
        'key3' => 'do not',
        'key4' => 'care about'
    ),
    1 => array(
        'key1' => '124',
        'key2' => 'values we',
        'key3' => 'do not',
        'key4' => 'care about'
    ),
    2 => array(
        'key1' => '125',
        'key2' => 'values we',
        'key3' => 'do not',
        'key4' => 'care about'
    )
);

AwesomeFunction($array, 'key1'); // returns 2 ($array key)

请善意,因为这个问题是用手机写的.谢谢.

Answer 1

引入PHP 5.5 array_column()使这更简单:

echo max(array_column($array, 'key1'));

演示

Answer 2

如果您知道您的数据将始终采用该格式,则此类内容应该有效.

function getMax( $array )
{
    $max = 0;
    foreach( $array as $k => $v )
    {
        $max = max( array( $max, $v['key1'] ) );
    }
    return $max;
}