PHP数组合并/映射两个数组

$array1 = array('a', 'b', 'c');
$array2 = array(1, 2, 3);
$result = array_merge($array1, $array2);

print_r($result);

Array
(
    [0] => a
    [1] => b
    [2] => c
    [3] => 1
    [4] => 2
    [5] => 3
)

$array1 = array('a', 'b', 'c');
$array2 = array(1, 2, 3);
$result = $array1 + $array2;

print_r($result);

$array1 = array('a' => 'apple', 'b' => 'banana');
$array2 = array('a' => 'ant', 'c' => 'cat');
$result = array_merge_recursive($array1, $array2);

print_r($result);

Array
(
    [a] => Array
        (
            [0] => apple
            [1] => ant
        )

    [b] => banana
    [c] => cat
)