如何合并数组和保存键？

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);

我想合并他们，并保持键和顺序，而不是重新索引! ！

怎么会变成这样？

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

我尝试使用 array _ merge () ，但它不会保留键:

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


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

我尝试使用联合运算符，但它不会覆盖该元素:

print_r($array1 + $array2);


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

我试图交换位置，但顺序是错误的，而不是我的需求:

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，有一个高性能的方法吗？

109641 次浏览
小开

I think this might help if i understand properly:

foreach ($i = 0, $num = count($array2); $i < $num; $i++)
{
$array = array_merge($array1, $arrar2[$i]);
}
小开

@Jack uncovered the native function that would do this but since it is only available in php 5.3 and above this should work to emulate this functionality on pre 5.3 installs 

  if(!function_exists("array_replace")){
function array_replace(){
$args = func_get_args();
$ret = array_shift($args);
foreach($args as $arg){
foreach($arg as $k=>$v){
$ret[(string)$k] = $v;
}
}
return $ret;
}
}
小开
最佳答案

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));

Available since PHP 5.3.

Update

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

print_r($array2 + $array1);
小开

array_replace_recursive() or array_replace() is the function you are looking for

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




var_dump(array_replace_recursive($array1, $array2));

Demo

小开

Let suppose we have 3 arrays as below.

$a = array(0=>['label'=>'Monday','is_open'=>1],1=>['label'=>'Tuesday','is_open'=>0]);


$b = array(0=>['open_time'=>'10:00'],1=>['open_time'=>'12:00']);


$c = array(0=>['close_time'=>'18:00'],1=>['close_time'=>'22:00']);

Now, if you want to merge all these array and want a final array that have all array's data under key 0 in 0 and 1 in 1 key as so on.

Then you need to use array_replace_recursive PHP function, as below.

$final_arr = array_replace_recursive($a, $b , $c);

The result of this will be as below.

Array
(
[0] => Array
(
[label] => Monday
[is_open] => 1
[open_time] => 10:00
[close_time] => 18:00
)


[1] => Array
(
[label] => Tuesday
[is_open] => 0
[open_time] => 12:00
[close_time] => 22:00
)


)

Hope the solution above, will best fit your requirement!!


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