PHP : How to merge child arrays?

Question

我有:

$colors = array(
    'apple' => array('green', 'red'),
    'grape' => array('green', 'purple'),
);

$countries = array(
    'apple' => array('china', 'usa')
    'grape' => array('spain', 'france')
);

预期输出:

$result = array(
    'apple' => array('green', 'red', 'china', 'usa'),
    'grape' => array('green', 'purple', 'spain', 'france'),
);

我怎样才能实现这个目标？

Answer 1

$result = array_merge_recursive($colors, $countries);

了解更多:http://php.net/manual/en/function.array-merge-recursive.php