Allow Adding/Editing Reviews for Contributers and Amins Only.

yz-allow-reviews-by-role.php

<?php

/**
 * Allow Adding/Editing Reviews for Contributers and Amins Only.
 */
function yzc_allow_reviews_by_role() {

    $can = false;

    // Get Current User Data.
    $user = wp_get_current_user();
    
    $allowed_roles = array( 'contributor', 'administrator' );

    foreach ( $allowed_roles as $role ) {
        if ( in_array( $role, (array) $user->roles ) ) {
            $can = true;
        }
    }

    return $can;

}

add_filter( 'yz_is_user_can_add_reviews', 'yzc_allow_reviews_by_role' );
add_filter( 'yz_is_user_can_edit_reviews', 'yzc_allow_reviews_by_role' );