Get a wordpress page URL by template name

get_url_by_template.php

<?php

if(!function_exists('get_url_by_template')){
	function get_url_by_template($tmpl){
		$pages = query_posts(array(
			'post_type' =>'page',
			'meta_key'  =>'_wp_page_template',
			'meta_value'=> $tmpl
		));

		$url = null;
		if(isset($pages[0])) {
			$url = get_page_link($pages[0]->ID);
		}
		wp_reset_query();
		return $url;
	}
}