Airidas

The code works in the theme when it is put through editor in header.php file.

The code of the template:

<?php get_header(); ?>

<div align="center">
<?php if ( function_exists( 'easingsliderlite' ) ) { easingsliderlite(); } ?>
</div>

<div id="main" class="row">

	<div id="content" class="col12">

				<div class="entry-description">
					<?php the_content(); ?>
					<?php wp_link_pages( array( 'before' => '<div class="page-links">' . __( 'Pages:', 'montezuma' ), 'after' => '</div>' ) ); ?>
				</div>

			<?php edit_post_link( __( "Edit", 'montezuma' ) ); ?>

			<div class="post-footer">

			</div>

		</div>

		<?php comments_template(); ?>

	</div>

<?php get_footer(); ?>

Looking at the template itself, it seems that PHP code is used and working properly.