PHP：数组键的情况下不区分大小写* *查找？ [英] php: Array keys case *insensitive* lookup?

问题描述

$myArray = array ('SOmeKeyNAme' => 7);  

我想 $ myArray的['somekeyname'] 返回 7 。结果
有没有办法做到这一点，没有操纵数组？

I want $myArray['somekeyname'] to return 7.
Is there a way to do this, without manipulating the array?

我不创建磁盘阵列，这样一个无法控制它的键

I don't create the array, an thus can not control it's keys

推荐答案

您不能没有任何线性搜索或改变原始数组做到这一点。最有效的方法将是使用上的按键用strtolower 当您插入，当你查找值。

Option 1 - change the way you create the array

You can't do this without either a linear search or altering the original array. The most efficient approach will be to use strtolower on keys when you insert AND when you lookup values.

 $myArray[strtolower('SOmeKeyNAme')]=7;

 if (isset($myArray[strtolower('SomekeyName')]))
 {

 }

如果重要的是要你preserve的关键原来如此，你可以将它保存为该键的附加价值，例如

If it's important to you to preserve the original case of the key, you could store it as a additional value for that key, e.g.

$myArray[strtolower('SOmeKeyNAme')]=array('SOmeKeyNAme', 7);

选项2 - 创建一个辅助映射

当你更新的问题表明这不会对你是不可能的，你怎么样建立一个数组小写和大小写敏感的版本之间提供映射？

Option 2 - create a secondary mapping

As you updated the question to suggest this wouldn't be possible for you, how about you create an array providing a mapping between lowercased and case-sensitive versions?

$keys=array_keys($myArray);
$map=array();
foreach($keys as $key)
{
     $map[strtolower($key)]=$key;
}

现在，你可以用它来获取区分大小写键小写有一个

Now you can use this to obtain the case-sensitive key from a lowercased one

$test='somekeyname';
if (isset($map[$test]))
{
     $value=$myArray[$map[$test]];
}

这避免了需要创建数组的完整副本与套管下键，这实在是唯一的其他方式来进行此事。

This avoids the need to create a full copy of the array with a lower-cased key, which is really the only other way to go about this.

如果使阵列的完整副本不是问题，那么你可以使用在array_change_key_case 以较低的套管键创建一个副本

If making a full copy of the array isn't a concern, then you can use array_change_key_case to create a copy with lower cased keys.

$myCopy=array_change_key_case($myArray, CASE_LOWER);

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