How can PHP developers prevent unauthorized access to their scripts and servers?

To prevent unauthorized access to PHP scripts and servers, developers can use authentication methods such as password protection, IP whitelisting, and session management. By implementing these security measures, developers can ensure that only authorized users have access to their scripts and servers. 

// Example of password protection for a PHP script
$username = 'admin';
$password = 'password123';

if (!isset($_SERVER['PHP_AUTH_USER']) || !isset($_SERVER['PHP_AUTH_PW']) || $_SERVER['PHP_AUTH_USER'] != $username || $_SERVER['PHP_AUTH_PW'] != $password) {
    header('WWW-Authenticate: Basic realm="Restricted Area"');
    header('HTTP/1.0 401 Unauthorized');
    echo 'Access Denied';
    exit;
}

Keywords

authentication authorization secure coding server-side validation access control

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