Check if user has enrolled into any course at your LearnPress website.

learnpress-enroll-status.php

<?php
/*
* Function to check if given user is enrolled into any course.
*/
function wpac_check_enrolled_user($user_id){

    if (is_numeric($user_id)) {
        //Global WordPress DB object
        global $wpdb;

        //User ID to check use get_current_user_id() if you want to fetch current logged-in user's ID
        $user_id = intval($user_id);

        //Table name of LearnPress user items
        $table_name = $wpdb->prefix . 'learnpress_user_items';

        //Database Query to count the results
        $check_enrollment = $wpdb->get_var( $wpdb->prepare(
            "SELECT COUNT(*) FROM `$table_name` WHERE user_id = %d",
            $user_id
        ) );

        if($check_enrollment > 0) {
            retrurn true;
        } else {
            rerturn false;
        }
    } else {
        rerturn false;
    }
}