What are best practices for handling user input validation in PHP to prevent spam submissions?

Spam submissions can be prevented by implementing proper user input validation in PHP. This includes checking for required fields, validating input formats (such as email addresses), and using CAPTCHA or honeypot techniques to detect spam bots. 

// Example of user input validation in PHP to prevent spam submissions

// Check if required fields are not empty
if(empty($_POST['name']) || empty($_POST['email']) || empty($_POST['message'])) {
    echo "Please fill out all required fields.";
    exit;
}

// Validate email format
if(!filter_var($_POST['email'], FILTER_VALIDATE_EMAIL)) {
    echo "Invalid email format.";
    exit;
}

// Implement CAPTCHA or honeypot technique to detect spam bots

// Process the form submission if all validations pass
// Your code to handle form submission goes here

Keywords

filter_var htmlspecialchars captcha CSRF token validation logic

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