创建推荐链接以在注册表单上自动填写用户名

Question

How to create a referral link to auto fill a user username on the registration form? I don't have any idea on how does this work and even how to start it. All I have is:

https://mywebsite.com/register?ref=<?php echo ($user['username']);?>

Please, I need helps. Thanks in advance.

Answer 1

You can use PHP's superglobal $_GET to grab the query string from the URL, then add that to the input's value.

$referral = htmlspecialchars($_GET['ref'] ?? '');

This will set the $referral variable to the given referral if it's there, otherwise, it'll be an empty string. Now you can use that in your input so set the referral.

<input type="text" name="referral" value="<?php echo $referral; ?>" />

Then when posted, you can check if a referral was set for this new registration and handle that accordingly. Whether that'll be setting a value in the database, sending the referral user an email, etc.

if (isset($_POST['referral'])) {
    // Handle the referral.
}

Hope that give's you some ideas.