php一维数组合并的三种方式对比

    $array1 = array(2,4,"color" => "red");
    $array2 = array("a", "b", "color" => "green", "shape" => "trapezoid", 4);
    $result = array_merge($array1, $array2);
    echo "----------------array_merge---------------".PHP_EOL;
    print_r($result);
    echo "----------------+++++++++++---------------".PHP_EOL;
    print_r($array1+$array2);
    echo "----------------array_merge_recursive---------------".PHP_EOL;
    print_r(array_merge_recursive($array1,$array2));

----------------array_merge---------------
Array
(
    [0] => 2
    [1] => 4
    [color] => green
    [2] => a
    [3] => b
    [shape] => trapezoid
    [4] => 4
)
----------------+++++++++++---------------
Array
(
    [0] => 2
    [1] => 4
    [color] => red
    [shape] => trapezoid
    [2] => 4
)
----------------array_merge_recursive---------------
Array
(
    [0] => 2
    [1] => 4
    [color] => Array
        (
            [0] => red
            [1] => green
        )
    [2] => a
    [3] => b
    [shape] => trapezoid
    [4] => 4
)