What are some alternative approaches to preventing spam in PHP applications, besides using a blacklist?

Spam in PHP applications can be prevented by implementing alternative approaches such as using CAPTCHA, implementing honeypot fields, and utilizing email verification. 

// Using CAPTCHA
$secretKey = "YOUR_SECRET_KEY";
$response = $_POST['g-recaptcha-response'];
$remoteIP = $_SERVER['REMOTE_ADDR'];
$recaptcha = file_get_contents("https://www.google.com/recaptcha/api/siteverify?secret=$secretKey&response=$response&remoteip=$remoteIP");
$recaptcha = json_decode($recaptcha);
if(!$recaptcha->success){
    // Handle spam submission
}

// Implementing honeypot fields
if(!empty($_POST['honeypot_field'])){
    // Handle spam submission
}

// Utilizing email verification
$email = $_POST['email'];
if(!filter_var($email, FILTER_VALIDATE_EMAIL)){
    // Handle spam submission
}

Keywords

CAPTCHA honeypot reCAPTCHA Akismet spam filter

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