How to nest php inside php

I want to display posts from a tag, but I want the tag to be modified based on the page.

Example (only important part: the_title and -suffix. I want to php call the title and then add -suffix myself manually to this code) (obviously this code doesn’t work):

<?php
$args=array(
'tag' => '<?php the_title(); ?>-suffix',
'showposts'=>2,
'caller_get_posts'=>1
);

…etc

Is anyone able to show me how to call the title here for tag but make it so its ‘the_title-suffix’?

Thanks