Question

我想从不同的数组中获取最大值。基本上，阵列来自3个不同的网站，我需要知道每个产品的最大tags和photos值。

我有以下数组：

$data = array(
    'domain1.com' => array(
        'id1' => array(
            'tags' => '5',
            'photos' => '4',
        ),
        'id2' => array(
            'tags' => '8',
            'photos' => '2',
        ),
        'id3' => array(
            'tags' => '6',
            'photos' => '1',
        ),
    ),
    'domain2.com' => array(
        'id1' => array(
            'tags' => '3',
            'photos' => '1',
        ),
        'id2' => array(
            'tags' => '4',
            'photos' => '9',
        ),
        'id3' => array(
            'tags' => '2',
            'photos' => '0',
        ),
    ),
    'domain3.com' => array(
        'id1' => array(
            'tags' => '7',
            'photos' => '3',
        ),
        'id2' => array(
            'tags' => '9',
            'photos' => '5',
        ),
        'id3' => array(
            'tags' => '2',
            'photos' => '4',
        ),
    ),
);

我需要获得以下结果：

$data = array(
    'id1' => array(
        'tags' => '7',
        'photos' => '4',
    ),
    'id2' => array(
        'tags' => '9',
        'photos' => '9',
    ),
    'id3' => array(
        'tags' => '6',
        'photos' => '4',
    ),
);

Answer 1

最简单的方法是使用嵌套的foreach循环来迭代和捕获数据。如果在结果数组中找到更高的值，则结果会更新。

$results = [];
foreach ($data as $domain => $items) {
    foreach ($items as $id => $elements) {
        if (!isset($results[ $id ])) {
            $results[ $id ] = [];
        }
        foreach ($elements as $tag => $value) {
            if (!isset($results[ $id ][ $tag ]) || $value>$results[ $id ][ $tag ]) {
                $results[ $id ][ $tag ] = $value;
            }
        }
    }
}

print_r($results);

Answer 2

这可以通过简单的循环解决：

$new = array();

foreach($data as $domain){
    foreach($domain as $id => $_data){
        foreach($_data as $elem => $value) { 
            if(!isset($new[$id][$elem]) || $value > $new[$id][$elem]){
                $new[$id][$elem] = $value;
            } 
        }
    }    
}

返回：

Array
(
    [id1] => Array
        (
            [tags] => 7
            [photos] => 4
        )

    [id2] => Array
        (
            [tags] => 9
            [photos] => 9
        )

    [id3] => Array
        (
            [tags] => 6
            [photos] => 4
        )

)

Example

从不同的数组中获取最大值

2 个答案: