What are some best practices for handling failed login attempts in PHP to prevent unauthorized access?

To prevent unauthorized access due to failed login attempts, it is essential to implement measures such as limiting the number of login attempts, implementing CAPTCHA verification after multiple failed attempts, and implementing account lockout mechanisms. 

// Check if the number of failed login attempts exceeds a certain threshold
$max_attempts = 3;
$failed_attempts = 0;

// Increment failed login attempts
$failed_attempts++;

// If failed attempts exceed the threshold, implement account lockout mechanism
if ($failed_attempts >= $max_attempts) {
    // Lock the account and notify the user
    echo "Your account has been locked due to multiple failed login attempts. Please contact the administrator.";
}

Keywords

authentication security login attempts error handling unauthorized access

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