What are the best practices for protecting PHP forms from brute-force attacks?

To protect PHP forms from brute-force attacks, you can implement measures such as limiting the number of login attempts, using CAPTCHA verification, and implementing IP address blocking for repeated failed attempts. 

// Limit the number of login attempts
$max_attempts = 3;
$attempts = 0;

if(isset($_SESSION['login_attempts'])){
    $attempts = $_SESSION['login_attempts'];
}

if($attempts >= $max_attempts){
    // Redirect to error page or block further attempts
    exit();
}

// Validate login credentials
if($valid_credentials){
    // Reset login attempts
    $_SESSION['login_attempts'] = 0;
} else {
    // Increment login attempts
    $_SESSION['login_attempts'] = $attempts + 1;
}

Keywords

CAPTCHA rate limiting session management CSRF protection password hashing

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