Edit the output of the author box with Genesis (advanced version)

functions.php

<?php
// Paste the code BELOW this line into your child theme functions.

/**
 * Edit the output of the author box with Genesis (advanced version)
 *
 * @author Reasons to Use Genesis
 * @link http://reasonstousegenesis.com/author-box-filter/
 */
add_filter( 'genesis_author_box', 'rtug_author_box_advanced', 10, 6 );
function rtug_author_box_advanced( $output, $context, $pattern, $gravatar, $title, $description ) {
	
	// no author box if no biographical info
	if ( ! $description )
		return '';
	
	// add a class
	if ( 'single' === $context )
		$output = str_replace( 'class="author-box"', 'class="author-box content-box-yellow"', $output );
	
	return $output;
	
}