What are some best practices for limiting the number of password input attempts in PHP?

Limiting the number of password input attempts is important for security reasons as it helps prevent brute force attacks on user accounts. One common approach is to track the number of failed login attempts and lock the account after a certain threshold is reached. 

session_start();

// Set the maximum number of login attempts
$max_attempts = 3;

// Check if the number of login attempts has exceeded the limit
if(isset($_SESSION['login_attempts']) && $_SESSION['login_attempts'] >= $max_attempts) {
    // Lock the account or display an error message
    echo "Account locked. Please try again later.";
    exit;
}

// Check the password input
if($password != $correct_password) {
    // Increment the login attempts counter
    if(isset($_SESSION['login_attempts'])) {
        $_SESSION['login_attempts']++;
    } else {
        $_SESSION['login_attempts'] = 1;
    }
}

Keywords

rate limiting password input authentication security PHP functions

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