php: Array keys case *insensitive* lookup?

Question

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

I want $myArray[\'somekeyname\'] to return 7.
Is there a way to do this

Answer 1

In my case I wanted an efficient workaround where my program was already creating the array using a foreach loop from customer data having unknown case, and I wanted to preserve the customer's case for later display in the program.

My solution was to create a separate array $CaseMap to map a given lowercase key to the mixedcase key used in the array (irrelevant code is omitted here):

$CaseMap=[];
foreach ($UserArray as $Key=>$Value)
    $CaseMap[strtolower($Key)]=$Key;

Then lookup is like this:

$Value=$UserArray[$CaseMap("key")];

and the memory overhead is just the $CaseMap array, which maps presumably short keys to short keys.

I'm not sure if PHP has a more efficient way to generate $CaseMap in the case where I'n not already using foreach.