Using a unique ID in templates

I'm trying to create a template that generate unique id to link an anchor to a div.

Something like

html:'\
<a href="my_anchor[UNIQUEID]">Hello</a>\
<div class="my_div[UNIQUEID]">My div content</div>';

The UNIQUEID would be the same, but it would be generated so that if I use the same template a second time in the same page the new different.

Something like php's uniqid()

Thank you