如何合并阵列和preserve钥匙？ [英] How to merge array and preserve keys?

问题描述

我有两个数组：

$array1 = array('a' => 1, 'b' => 2, 'c' => 3);
$array2 = array('d' => 4, 'e' => 5, 'f' => 6, 'a' => 'new value', '123' => 456);

我想将它们合并，并保持键和秩序，而不是重新索引！

I want to merge them and keep the keys and the order and not re-index!!

如何获得这样呢？

Array
(
    [a] => new value
    [b] => 2
    [c] => 3
    [d] => 4
    [e] => 5
    [f] => 6
    [123] => 456
)

我尝试array_merge（），但它不会是preserved键：

I try to array_merge() but it will not be preserved the keys:

print_r(array_merge($array1, $array2));

Array
(
    [a] => 'new value'
    [b] => 2
    [c] => 3
    [d] => 4
    [e] => 5
    [f] => 6
    [0] => 456
)

我尝试联合运营商，但它不会覆盖该元素：

I try to the union operator but it will not overwriting that element:

print_r($array1 + $array2);

Array
(
    [a] => 1   <-- not overwriting
    [b] => 2
    [c] => 3
    [d] => 4
    [e] => 5
    [f] => 6
    [123] => 456
)

我试着换地方，但顺序错了，不是我的需要：

I try to swapped place but the order is wrong, not my need:

print_r($array2 + $array1);

Array
(
    [d] => 4
    [e] => 5
    [f] => 6
    [a] => new value 
    [123] => 456
    [b] => 2
    [c] => 3
)

我不想使用一个循环，是有高性能？的

I dont want to use a loop, is there a way for high performance?

推荐答案

您正在寻找 array_replace（） ：

You're looking for array_replace():

$array1 = array('a' => 1, 'b' => 2, 'c' => 3);
$array2 = array('d' => 4, 'e' => 5, 'f' => 6, 'a' => 'new value', '123' => 456);
print_r(array_replace($array1, $array2));

自PHP 5.3中提供的。

Available since PHP 5.3.

更新

您也可以使用union 数组运算符;它适用于旧版本实际上可能会更快太：

You can also use the union array operator; it works for older versions and might actually be faster too:

print_r($array2 + $array1);

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