Show author avatar in entry header of feature post only, not teasers - in Genesis - support for Co-Authors Plus

author-avatar-in-post-header.php

<?php
/**
 * Places the author avatar next to the entry header for feature posts, not teaser posts.
 * Includes support for co-authors plus plugin
 * Replace the BLOGLOGURL with an actual url to an alternate image
 * 
 * @author Joshua David Nelson, joshuadnelson.com
 **/

add_action( 'genesis_entry_header', 'jdn_author_post_avatar', 1 ); // using a priority of 1 to insure it is first, before title

function jdn_author_post_avatar() {

	if( is_home() || is_single() ){ // only on blog page and single post pages, not on archives

		if( in_array( 'feature', get_post_class( '', get_the_ID() ), true ) || is_single() ) { // only on posts with a 'feature' class

			if( !function_exists( 'get_coauthors' ) || ( function_exists( 'get_coauthors' ) && 1 == count( get_coauthors( get_the_id() ) ) ) ) { // if using co-authors and a single author, or if not using co-authors

				if( get_query_var( 'author_name' ) ) {
					$curauth = get_userdatabylogin( get_query_var( 'author_name' ) );
				} else {
					$curauth = get_userdata( get_query_var( 'author' ) );
				}

				?>
				<div class="author_grav">
					<? echo "<a href=\"/author/" . get_the_author_meta( 'user_login' ) . "\">" . get_avatar( get_the_author_meta( 'email' ), '50' ) . "</a>"; ?>
				</div>
				<?php

			} else { // otherwise, let's use the blog logo

				?>
				<div class="author_grav">
					<a href="/members/"><img src="BLOGLOGOURL" width="50" height="50" class="avatar" /></a>
				</div>
				<?php

			}
		}
	}
}