How can PHP scripts be modified to prevent spam or hacking attacks on webmail functionality?

To prevent spam or hacking attacks on webmail functionality, PHP scripts can be modified to include input validation, captcha verification, and secure authentication methods. By filtering and sanitizing user input, implementing captcha to prevent automated spam submissions, and using secure authentication practices, webmail functionality can be protected from spam and hacking attacks. 

// Example of input validation and sanitization
$email = filter_var($_POST['email'], FILTER_SANITIZE_EMAIL);
$message = filter_var($_POST['message'], FILTER_SANITIZE_STRING);

// Example of captcha verification
if($_POST['captcha'] != $_SESSION['captcha']){
    // Captcha verification failed
    // Handle error or redirect
}

// Example of secure authentication
if(!isLoggedIn()){
    // Redirect to login page or display error message
}

Keywords

PHP webmail spam prevention hacking attacks security measures

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