Genesis titles for tag1+tag2 or tag1,tag2 combined term archives

functions.php

<?php

// Have to unhook the original function early
add_action( 'init', 'scl_fix_taxonomy_archive_titles' );

function scl_fix_taxonomy_archive_titles() {
	remove_action( 'genesis_before_loop', 'genesis_do_taxonomy_title_description', 15 );
	add_action( 'genesis_before_loop', 'scl_do_taxonomy_title_description', 14 );
}

function scl_do_taxonomy_title_description() {

	if ( ! is_category() && ! is_tag() && ! is_tax() )
		return;
	if ( is_search() )
		return;
	
	$taxonomy = get_query_var( 'taxonomy' );
	$topics = get_query_var( $taxonomy );
	if ( is_array( $topics ) )
		$topics = implode( ',', $topics );
	$hascomma = strpos( $topics, ',' );
	$hasplus = strpos( $topics, '+' );
	 
	if ( $hascomma !== false OR $hasplus !== false ) {
		if ( $hascomma ) {
			$sep = ',';
			$glue = ' or ';
		}
		else {
			$sep = '+';
			$glue = ' and ';
		}
		
		$newtitles = array();
		$terms = explode( $sep, $topics );
		foreach ( $terms as $single ) {
			$termobj = get_term_by( 'slug', $single, $taxonomy );
			$newtitles[] = $termobj->name;
		}
		$headline = sprintf( '<h1 %s>%s</h1>', genesis_attr( 'archive-title' ), implode( $glue, $newtitles ) );
		printf( '<div %s>%s</div>', genesis_attr( 'taxonomy-archive-description' ), $headline );
		return;
	}
	else
		add_action( 'genesis_before_loop', 'genesis_do_taxonomy_title_description', 15 );
}