What are common pitfalls to avoid when developing a PHP website?

Common pitfalls to avoid when developing a PHP website include not sanitizing user input, neglecting to validate form data, and failing to secure sensitive information. To address these issues, always sanitize and validate user input to prevent SQL injections and other security vulnerabilities. Additionally, encrypt sensitive data and use secure connections to protect user information. 

// Sanitize user input
$clean_input = filter_var($_POST['input'], FILTER_SANITIZE_STRING);

// Validate form data
if (isset($_POST['submit'])) {
    if (!empty($_POST['username']) && !empty($_POST['password'])) {
        // Process form data
    } else {
        echo "Please fill in all fields";
    }
}

// Secure sensitive information
$encrypted_data = openssl_encrypt($sensitive_data, 'AES-256-CBC', $encryption_key, 0, $iv);

Keywords

SQL injection Cross-site scripting (XSS) CSRF attacks insecure file uploads outdated PHP versions

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