What are some recommended resources or articles for learning about PHP security measures against spam submissions?

Spam submissions can be a common issue in web forms, where bots or malicious users submit unwanted content. To prevent this, PHP developers can implement security measures such as CAPTCHA verification, honeypot fields, input validation, and rate limiting. 

```php
// Example of implementing a CAPTCHA verification in PHP
session_start();

if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    if ($_POST['captcha'] == $_SESSION['captcha']) {
        // CAPTCHA verification passed, process form submission
    } else {
        // CAPTCHA verification failed, display error message
    }
}
```

Recommended articles for learning more about PHP security measures against spam submissions:
1. "Securing PHP Forms Against Spam and Bots" by SitePoint: https://www.sitepoint.com/php-forms-spam-bots/
2. "Preventing Spam in PHP Forms" by Tuts+: https://code.tutsplus.com/tutorials/preventing-spam-in-php-forms--cms-28868
3. "How to Prevent Spam on Your PHP Website" by Kinsta: https://kinsta.com/blog/php-spam-prevention/

Keywords

PHP security spam submissions resources articles measures

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