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

functions.php

<?php

// Display titles of all terms in combined term archive breadcrumbs (tag1+tag2 or tag1,tag2)
function scl_multiple_tax_breadcrumbs( $crumbs, $args ) {
	if ( !is_tax() )
		return $crumbs;

	$taxonomy = get_query_var( 'taxonomy' );
  $topics = get_query_var( $taxonomy );
	if ( empty( $topics ) )
		return $crumbs;
		
	$hascomma = strpos( $topics, ',' );
	$hasplus = strpos( $topics, '+' );
	 
	if ( $hascomma !== false OR $hasplus !== false ) {
		if ( $hascomma ) {
			$sep = ',';
			$glue = ' or ';
		}
		else {
			$sep = '+';
			$glue = ' and ';
		}
		
		$crumb = end( $crumbs );
		$linkedcrumbs = substr( $crumb, 0, strrpos( $crumb, $args['sep'] ) );
		$newcrumbs = array();
		$terms = explode( $sep, $topics );
		foreach ( $terms as $term ) {
			$termobj = get_term_by( 'slug', $term, 'work_zone_topics' );
			$newcrumbs[] = $termobj->name;
		}
		$crumbs = array( $linkedcrumbs, implode( $glue, $newcrumbs ) );
	}
	
	return $crumbs;
}

add_filter( 'genesis_build_crumbs', 'scl_multiple_tax_breadcrumbs', 10, 2 );