What are some common issues when coding user activation links in PHP?

One common issue when coding user activation links in PHP is that the link may not be properly formatted or generated, leading to errors when users try to activate their accounts. To solve this issue, make sure to properly encode the activation token and include it in the activation link. 

// Generate activation link with encoded token
$activation_token = generate_activation_token();
$activation_link = "http://example.com/activate.php?token=" . urlencode($activation_token);

// Send activation link to user via email
// Code to send email with activation link
```

Another common issue is that the activation link may expire after a certain period of time, causing users to encounter errors when trying to activate their accounts. To solve this issue, set an expiration time for the activation link and validate it before activating the user account.

```php
// Check if activation link has expired
$activation_token = $_GET['token'];
$expiration_time = strtotime($activation_token['expiration_time']);
if (time() > $expiration_time) {
    // Activation link has expired, display error message
    echo "Activation link has expired. Please request a new one.";
} else {
    // Activate user account
    activate_user_account($activation_token);
}

Keywords

email validation token generation database queries expiration time error handling

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