php数组合并merge

来自官方示例

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

数组中有的标记了下标，有的没有标记下标(索引)

有下标的将会沿用下标，如果下标相同，则会覆盖
没有下标的，将会从0开始索引
值不会覆盖

结果

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