Hello,

It would work quite similarly to when receiving a single input instance.

For example let’s say that you wanted to select a user where the user’s last name and first name are specified in your input:

try {
    $pdo = new PDO("mysql:host=$host;dbname=$dbname", $username, $password);

    $sql = 'SELECT lastname,
                    firstname,
               FROM users
              WHERE lastname LIKE :lastname OR 
                    firstname LIKE :firstname;';

    $q = $pdo->prepare($sql);

    $q->execute([':lastname' => $POST['lastname'],
        ':firstname' => $POST['firstname']]);

    $q->setFetchMode(PDO::FETCH_ASSOC);

    // print out the result set
    while ($r = $q->fetch()) {
        echo sprintf('%s <br/>', $r['lastname']);
    }
} catch (PDOException $e) {
    die("Could not connect to the database $dbname :" . $e->getMessage());
}

I would also recommend this tutorial here on how to use PDO PHP to perform MySQL transactions:

https://www.digitalocean.com/community/tutorials/how-to-use-the-pdo-php-extension-to-perform-mysql-transactions-in-php-on-ubuntu-18-04

Also, I could strongly recommend learning Laravel as your first PHP framework, as it makes it easy to interact with your database:

https://www.digitalocean.com/community/tutorials/how-to-query-the-database-in-laravel-with-eloquent-select

Hope that this helps.
Regards,
Bobby