How to shove sending a request to vk api into a function?

Question

PHP

I can not shove sending requests (for example, to send messages) to vk api into a separate function. Outside the function, requests are sent.
Here are two functions:
The first (for example) works

function logUpdate($message) 
{        
        $dateTime = date("Y-m-d H:i:s");
        $fp = fopen('log.txt', 'a');
        $test = fwrite($fp, "[{$dateTime}] " . $message . "<br>"); 
        fclose($fp); 
}

The second one, when called, gives the error "Uncaught Error: Call to undefined function VKMessage()"

function VKMessage($_message, $_userId, $_token)
{
   $request_params = array(
                    'message' => $_userPostsCount,
                    'user_id' => $_userId,
                    'access_token' => $_token,
                    'v' => '5.0'
                );
                $get_params = http_build_query($request_params);
                file_get_contents('https://api.vk.com/method/messages.send?' . $get_params);
}

If you add any other code to this function (for example, calling the logUpdate function), then there will be no error, but the request to the VK API will not be executed in any case. What is the problem?

Answer 1

Call to undefined function vkSendMessage()
function VKMessage eh
?