Coranto SSI

I’m trying to implement Coranto SSI into my wordpress theme, and I need to know how to convert this statement into PHP

<!–#include virtual=”/coranto/news.txt” –>

I’ve already tried this statement:

<?php virtual(‘/=/coranto/news.txt’); ?>

but it results in this fatal error:

“Fatal error: Call to undefined function: virtual() in /home/u1/nospinzone/html/wp-content/themes/newsportal-10/index.php on line 12”

any ideas?