In php how to pass user id in url
In contact page i have a bootstrap model form (User Registration)
Ex:
<form action="register.php?url= <?php echo basename($_SERVER['PHP_SELF']); ?>" method="POST">
<input type="text" name="username">
<button type = "submit" name="user_registration">Submit</button>
</form>
When the submit button hit page goes to register.php?url=contact.php but here i need with id also ex: register.php?url=contact.php?id=4
How can i do that?