Executing PHP functions through HTML/PHP links

is is possible to execute a PHP function, such as the one below through a PHP or HTML link?

function MyFunction()
{
blah blah blah
}

The link has to execute a script that can execute your function.
It's not like JavaScript

what script would i need for PHP to execute my function??

a php script.

Your link:

yourcode.php:
<?php

if($_GET['executeFunction']){
classname::MyFunction();
//or if its an object...
object->MyFunction();
}