php 替换数组中的某个值

$array1 = array('a' => 1, 'b' => 2, 'c' => 3);
$array2 = array('b' => 4, 'c' => 5, 'd' => 6);
$result = array_replace($array1, $array2);
print_r($result);


Array
(
    [a] => 1
    [b] => 4
    [c] => 5
    [d] => 6
)