Adding support for multiple authors

inc/template-tags.php

@@ -75,17 +75,27 @@ function cs_posted_on() {
 		esc_attr( get_the_modified_date( 'c' ) ),
 		esc_html( get_the_modified_date() )
 	);
-
-	printf( __( '<span class="posted-on">Posted on %1$s</span><span class="byline"> by %2$s</span>', 'cs' ),
-		sprintf( '<a href="%1$s" rel="bookmark">%2$s</a>',
-			esc_url( get_permalink() ),
-			$time_string
-		),
-		sprintf( '<span class="author vcard"><a class="url fn n" href="%1$s">%2$s</a></span>',
-			esc_url( get_author_posts_url( get_the_author_meta( 'ID' ) ) ),
-			esc_html( get_the_author() )
-		)
-	);
+
+    if ( function_exists( 'coauthors_posts_links' ) ) :
+        printf( __( '<span class="posted-on">Posted on %1$s</span><span class="byline"> by %2$s</span>', 'cs' ),
+            sprintf( '<a href="%1$s" rel="bookmark">%2$s</a>',
+				esc_url( get_permalink() ),
+				$time_string
+			),
+            coauthors_posts_links( null, null, null, null, false )
+        );
+    else:
+		printf( __( '<span class="posted-on">Posted on %1$s</span><span class="byline"> by %2$s</span>', 'cs' ),
+			sprintf( '<a href="%1$s" rel="bookmark">%2$s</a>',
+				esc_url( get_permalink() ),
+				$time_string
+			),
+			sprintf( '<span class="author vcard"><a class="url fn n" href="%1$s">%2$s</a></span>',
+				esc_url( get_author_posts_url( get_the_author_meta( 'ID' ) ) ),
+				esc_html( get_the_author() )
+			)
+		);
+    endif;
 }
 endif;