php With User Interface

I am just starting out with PHP. ? I have resorted to doing some custom PHP programming because the plug-INs for a CMS I am using need a little customization.

The question I have is very simple and I am sure PHP programmers can answer this instantly. ? I have successfully declared a global PHP variable. ? All I need to know how to do for now is how to declare a button or a hyperlink or an input form element such that it can change the assignment of this variable.

You should use commands to print HTML code. Of course in order to do that you need to learn some html first :)

HTML is easy. ? Actually, PHP is easy too. ? Using PHP script to echo HTML is also easy. ? But this does nothing. ? This does not tell me how HTML can be used to create a button that, once it is clicked will reassign a php variable.

PHP and HTML are software languages right? Looks like they can work together. Not familiar with that.

Facebook PHP Toolkit is a PHP library containing a number of the most used Facebook Graph API user interfaces that are used on Facebook

Might anyone know any good designers for Drupal Source Code?