php中array merge

<?php
$array1 = array("color" => "red", 2, 4);
$array2 = array("a", "b", "color" => "green", "shape" => "trapezoid", 4);
$result = array_merge($array1, $array2);
print_r($result);
?>

Array
(
    [color] => green
    [0] => 2
    [1] => 4
    [2] => a
    [3] => b
    [shape] => trapezoid
    [4] => 4
)

<?php
$array1 = array("color" => "red", 2, 4);
$array2 = array("a", "b", "color" => "green", "shape" => "trapezoid", 4);
$result = array_merge_recursive($array1, $array2);
print_r($result);
?>

Array
(
    [color] => Array
        (
            [0] => red
            [1] => green
        )

    [0] => 2
    [1] => 4
    [2] => a
    [3] => b
    [shape] => trapezoid
    [4] => 4
)

<?php
$array1 = array("color" => "red", 2, 4);
$array2 = array("a", "b", "color" => "green", "shape" => "trapezoid", 4);

$result = $array1;
foreach ($array2 as $key => $value) {
    if (isset($result[$key])) {
        // 处理键名冲突
        $result[$key] = array_merge((array)$result[$key], (array)$value);
    } else {
        $result[$key] = $value;
    }
}
print_r($result);
?>

Array
(
    [color] => Array
        (
            [0] => red
            [1] => green
        )

    [0] => 2
    [1] => 4
    [2] => a
    [3] => b
    [shape] => trapezoid
    [4] => 4
)