user-rating-exists.php

<?php
// get post id - assumes in WP loop
global $post;
$post_id = $post->ID;
	
// get default rating form for post, this checks the filter settings, post meta and general settings
$rating_form_id = MRP_Utils::get_rating_form( $post_id );
	
// get current logged in user
$user_id = 0; // anonymous
$user = wp_get_current_user();
if ( $user && $user->ID ) {
	$user_id = $user->ID;
}
	
// show rating form is not logged in or user has not yet rated, otherwise show rating item 
// results in option block layout
if ( $user_id == 0 || ! MRP_Multi_Rating_API::user_rating_exists( $rating_form_id, $post_id, $user_id ) ) {
	mrp_rating_form();
} else {
	mrp_rating_item_results( array( 'layout' => 'options_block' ) );
}