PHP，使用公共键合并数组 [英] PHP, Merging arrays with common keys

问题描述

我需要将两个数组合并为一个，同时保留所有键并在数组中列出值，如下例所示:

I need to get two arrays to merge into one while keeping all the keys in place and listing the values in an array like in this example:

$array1 = array('car' => '3', 'bus' => '2');
$array2 = array('dog' => '1', 'car' => '2', 'bird' => '9');  

$merged = array(
    'car' => array('3','2'), 
    'bus' => array('2',null),
    'dog' => array(null,'1'),
    'bird' => (null,'9')
);

推荐答案

function merge_common_keys(){
    $arr = func_get_args();
    $num = func_num_args();

    $keys = array();
    $i = 0;
    for ($i=0; $i<$num; ++$i){
        $keys = array_merge($keys, array_keys($arr[$i]));
    }
    $keys = array_unique($keys);

    $merged = array();

    foreach ($keys as $key){
        $merged[$key] = array();
        for($i=0; $i<$num; ++$i){
            $merged[$key][] = isset($arr[$i][$key]) ? $arr[$i][$key] : null;
        }
    }
    return $merged;
}

用法:

$merged = merge_common_keys($array1,$array2);

附注.它可以处理两个以上的数组，只需传递任意数量的下一个参数即可.

PS. It can work with more than two arrays, just pass as many as you want as next arguments.

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