What are common pitfalls when using PHP for HTML newsletters?

Common pitfalls when using PHP for HTML newsletters include not properly sanitizing user input, not handling unsubscribe requests correctly, and not testing the email layout across different email clients. To sanitize user input, use functions like htmlspecialchars() to prevent XSS attacks: 

$user_input = "<script>alert('XSS attack');</script>";
$sanitized_input = htmlspecialchars($user_input, ENT_QUOTES);
echo $sanitized_input;
```

To handle unsubscribe requests, include an unsubscribe link in the email that directs users to a page where they can opt out of future emails:
```php
$unsubscribe_link = "http://example.com/unsubscribe.php";
echo "<a href='$unsubscribe_link'>Unsubscribe</a>";
```

To test email layout across different clients, use email testing tools like Litmus or Email on Acid to ensure compatibility:
```php
// No code snippet needed for this, as it involves external testing tools.

Keywords

HTML newsletters PHP mail function CSS inlining email deliverability spam filters

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