How to fetch data from mysql using ajax/jquery when passing three different parameter from html form

I have Stream, Academic year, batch and semester as input to fetch students data through php who belongs to these Stream, Academic year, batch and semester passed from html form.

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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,
               FROM users
              WHERE lastname LIKE :lastname OR 
                    firstname LIKE :firstname;';

    $q = $pdo->prepare($sql);
    $q->execute([':lastname' => $POST['lastname'],
        ':firstname' => $POST['firstname']]);
    // print out the result set
    while ($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:

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

Hope that this helps. Regards, Bobby