How to get page ID inside a tag

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edit: I've made it work, all i needed to do is make the code look like this: <?php echo ThumbsUp::item($c->getCollectionID()) ?>

Hi,

I'm not a programmer, but here's what I want to do:

I have this:
<?php echo ThumbsUp::item('item_name') ?>

And I want instead of item_name to have the page ID.

So, I've tried this:
<?php echo ThumbsUp::item('<?php echo $c->getCollectionID(); ?>') ?>


But, as you might know, that doesn't work and I don't know how to syntax (or what's it called), in order to call the page ID instead of item_name.