Sample code

gistfile1.aw

<?php if ( function_exists( 'coauthors_posts_links' ) ) { ?>

			<?php if ( $post_type->name != 'page' && $graphene_settings['hide_post_author'] != true ) : ?>
			<p class="post-author author vcard">
			<span class="fn nickname">
			by <?php coauthors_posts_links(); ?>
			</span>
			</p>
			<?php endif; ?>

<?php } else { ?>

			<?php /* Post author, not shown if this is a Page post or if admin decides to hide it */ ?>

			<?php if ( $post_type->name != 'page' && $graphene_settings['hide_post_author'] != true ) : ?>

            <p class="post-author author vcard">

				<?php

				/* translators: this is for the author byline, such as 'by John Doe' */

				$author_url = '<a href="' . get_author_posts_url( get_the_author_meta( 'ID' ) ) . '" class="url">' . get_the_author_meta( 'display_name' ) . '</a>';

				printf( __( 'by %s', 'graphene' ), '<span class="fn nickname">' . $author_url . '</span>' );

				?>

			</p>

			<?php endif; ?>

<?php } ?>