如何从PHP多维数组中删除重复项，不区分大小写但保留大小写？

function removeDuplicates(&$array) {
    $newArray = array();
    
    foreach ($array as $key => $value) {
        if (is_array($value)) {
            removeDuplicates($value);
        } else {
            $lowercaseValue = strtolower($value);
            
            if (!in_array($lowercaseValue, $newArray)) {
                $newArray[] = $lowercaseValue;
            }
        }
    }
    
    $array = $newArray;
}

// 示例用法
$multiDimensionalArray = array(
    "Apple",
    "Banana",
    array(
        "apple",
        "Cherry",
        "banana"
    ),
    "cherry"
);

removeDuplicates($multiDimensionalArray);

print_r($multiDimensionalArray);

Array
(
    [0] => Apple
    [1] => Banana
    [2] => Array
        (
            [0] => apple
            [1] => Cherry
        )
    [3] => cherry
)