PDO Insert data to database

 <?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDBPDO";

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 MyGuests (firstname, lastname, email)
  VALUES ('John', 'Doe', 'john@example.com')"
  VALUES ('John', 'Doe', 'john@example.com')"
  VALUES ('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;
?>