如何在PHP中使用array_change_key_case（）来更改多维数组中的键大小写？

My multidimensional arrays are

$input_array = array(
    array(
        'First' => 1,
        'Third' => 3
    ),
    'Second' => 2,
    'Fourth' => 4
);

$another_array = array(
    'First' => array(
        'Third' => 3,
        'Fifth' => 5
    ),
    'Second' => 2,
    'Fourth' => 4
);

How can I change the key case of these two multidimensional arrays using array_change_key_case() in PHP?

Find answer here http://php.net/manual/en/function.array-change-key-case.php#114914

function array_change_key_case_recursive($arr)
{
    return array_map(function($item){
        if(is_array($item))
            $item = array_change_key_case_recursive($item);
        return $item;
    },array_change_key_case($arr));
}

$input_array = array(array('First'=>1,'Third'=>3),'Second'=>2,'Fourth'=>4);

return array_change_key_case_recursive($input_array);

Try demo https://implode.io/LCW5CG