<?php
$servername = "localhost";
$username = "root";
$password = null;
$dbname = "mydb";

try {
    $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
    // set the PDO error mode to exception
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $sql = "INSERT INTO users (user_username, user_password, user_firstname, user_lastname, user_email)
    VALUES ('admin', '" . password_hash("ditiseenwachtwoord", PASSWORD_DEFAULT) . "', 'John', 'Doe', 'john@example.com')";
    // use exec() because no results are returned
    $conn->exec($sql);
    echo "New record created successfully";
}
catch(PDOException $e)
{
    echo $sql . "<br>" . $e->getMessage();
}

$conn = null;
?>