Include a file

<?php include_once($_SERVER[“DOCUMENT_ROOT”] . base_path() . path_to_theme() . “/nav.php”); ?>

Condition for Login Logout

<?php if (user_is_logged_in()): ?>  <p>Hello, logged in user</p>

<?php else:?>  <p>Hello, stranger</p>

<?php endif;?>

Call Static image in theme

<img src=”<?php print base_path() . path_to_theme(); ?>/images/banner-side-1.jpg” alt=””>

Condition for home page

<?php if (drupal_is_front_page()){

echo ‘this is home’;

} ?>