PHP,使用公共键合并数组
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')
);
答
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.