Referring Affiliate's avatar - example shortcode

gistfile1.txt

add_action( 'init', 'referring_affiliate_avatar_shortcode' );
function referring_affiliate_avatar_shortcode() {
	add_shortcode( 'referring-affiliate-avatar', 'referring_affiliate_avatar' );
}
function referring_affiliate_avatar( $atts ) {
	$output = '';
	if ( !is_admin() ) {
		if ( !class_exists( "Affiliates_Service" ) ) {
			include_once( AFFILIATES_CORE_LIB . '/class-affiliates-service.php' );
			$affiliate_id = Affiliates_Service::get_referrer_id(); 
			if ( $affiliate_id && $affiliate_id != affiliates_get_direct_id() ) {
				if ( $user_id = affiliates_get_affiliate_user( $affiliate_id ) ) {
					if ( $user = get_user_by( 'id', $user_id ) ) {
						$output .= 'You come referred by: ';
						if ( get_avatar( $user_id ) ) {
							$output .= get_avatar( $user_id );
						} else {
							$output .= $user->user_login ;
						}
					}
				}
			}
		}
	}
	
	return $output;
}