What are best practices for handling form submissions in PHP to prevent spam bot submissions?

Spam bots can easily submit forms on websites, leading to unwanted submissions. To prevent this, you can implement CAPTCHA verification or honeypot fields in your form to distinguish between human and bot submissions. Additionally, you can add validation checks for form fields to ensure that only legitimate data is being submitted. 

// Example code snippet for implementing CAPTCHA verification in PHP form submission

if(isset($_POST['submit'])){
    $captcha = $_POST['captcha'];
    
    // Verify CAPTCHA code
    if($captcha != $_SESSION['captcha']){
        // CAPTCHA verification failed, handle accordingly
        echo "CAPTCHA verification failed";
    } else {
        // CAPTCHA verification successful, process form submission
        // Add code here to handle form submission
    }
}

Keywords

CAPTCHA honeypot form validation CSRF token reCAPTCHA

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