PHP：合并两个数组同时保留键而不是重新索引？
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PHP: merge two arrays while keeping keys instead of reindexing?
提问by Garrett
How can I merge two arrays (one with string => value pairs and another with int => value pairs) while keeping the string/int keys? None of them will ever overlap (because one has only strings and the other has only integers).
如何在保留 string/int 键的同时合并两个数组（一个带有字符串 => 值对，另一个带有 int => 值对）？它们都不会重叠（因为一个只有字符串，另一个只有整数）。
Here is my current code (which doesn't work, because array_merge is re-indexing the array with integer keys):
这是我当前的代码（它不起作用，因为 array_merge 正在使用整数键重新索引数组）：
// get all id vars by combining the static and dynamic
$staticIdentifications = array(
Users::userID => "USERID",
Users::username => "USERNAME"
);
// get the dynamic vars, formatted: varID => varName
$companyVarIdentifications = CompanyVars::getIdentificationVarsFriendly($_SESSION['companyID']);
// merge the static and dynamic vars (*** BUT KEEP THE INT INDICES ***)
$idVars = array_merge($staticIdentifications, $companyVarIdentifications);
回答by SirDarius
You can simply 'add' the arrays:
您可以简单地“添加”数组：
>> $a = array(1, 2, 3);
array (
0 => 1,
1 => 2,
2 => 3,
)
>> $b = array("a" => 1, "b" => 2, "c" => 3)
array (
'a' => 1,
'b' => 2,
'c' => 3,
)
>> $a + $b
array (
0 => 1,
1 => 2,
2 => 3,
'a' => 1,
'b' => 2,
'c' => 3,
)
回答by CRK
Considering that you have
考虑到你有
$replaced = array('1' => 'value1', '4' => 'value4');
$replacement = array('4' => 'value2', '6' => 'value3');
Doing $merge = $replacement + $replaced;will output:
做$merge = $replacement + $replaced;将输出：
Array('4' => 'value2', '6' => 'value3', '1' => 'value1');
The first array from sum will have values in the final output.
sum 中的第一个数组将在最终输出中具有值。
Doing $merge = $replaced + $replacement;will output:
做$merge = $replaced + $replacement;将输出：
Array('1' => 'value1', '4' => 'value4', '6' => 'value3');
回答by danopz
While this question is quite old I just want to add another possibility of doing a merge while keeping keys.
虽然这个问题很老了，但我只想添加另一种在保留密钥的同时进行合并的可能性。
Besides adding key/values to existing arrays using the +sign you could do an array_replace.
除了使用+符号将键/值添加到现有数组之外，您还可以执行array_replace.
$a = array('foo' => 'bar', 'some' => 'string');
$b = array(42 => 'answer to the life and everything', 1337 => 'leet');
$merged = array_replace($a, $b);
The result will be:
结果将是：
Array
(
[foo] => bar
[some] => string
[42] => answer to the life and everything
[1337] => leet
)
Same keys will be overwritten by the latter array.
There is also an array_replace_recursive, which do this for subarrays, too.
相同的键将被后一个数组覆盖。
还有一个array_replace_recursive，它也对子数组执行此操作。
回答by amba patel
Two arrays can be easily added or union without chaning their original indexing by +operator. This will be very help full in laravel and codeigniter select dropdown.
两个数组可以很容易地添加或合并，而无需通过+运算符更改它们的原始索引。这将非常有助于 laravel 和 codeigniter 选择下拉列表。
$empty_option = array(
''=>'Select Option'
);
$option_list = array(
1=>'Red',
2=>'White',
3=>'Green',
);
$arr_option = $empty_option + $option_list;
Output will be :
输出将是：
$arr_option = array(
''=>'Select Option'
1=>'Red',
2=>'White',
3=>'Green',
);
回答by zdenek
Try array_replace_recursive or array_replace functions
尝试 array_replace_recursive 或 array_replace 函数
$a = array('userID' => 1, 'username'=> 2);
array (
userID => 1,
username => 2
)
$b = array('userID' => 1, 'companyID' => 3);
array (
'userID' => 1,
'companyID' => 3
)
$c = array_replace_recursive($a,$b);
array (
userID => 1,
username => 2,
companyID => 3
)
http://php.net/manual/en/function.array-replace-recursive.php
http://php.net/manual/en/function.array-replace-recursive.php
