WP Super Cache Content Dynamic Problem

I have a problem and i can’t get wp super cache dynamic tag to work for some reason, can anyone help me?

This is what i did.

I define $wp_super_cache_late_init = 1; //Added by WP-Cache Manager in
wp-cache-config.php inside my wp-content folder
Then i set my caching mode to Use PHP to serve cache files.
After that i tried executing a function in single.php

Here’s the original php code i want to make dynamic.
<?php wprp(true); ?>

<!–mfunc wprp(true) –>
<?php wprp(true); ?>
<!–/mfunc–>

Isn’t that how i’m suppose to use the mfunc tag? Or did i do anything wrong?