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What are the potential security risks involved in integrating external scripts, such as voting systems, into PHP websites, and how can developers mitigate these risks?

Potential security risks involved in integrating external scripts into PHP websites include cross-site scripting (XSS) attacks, injection vulnerabilities, and data leakage. Developers can mitigate these risks by sanitizing input data, validating and escaping output data, and implementing proper access controls.

php 
// Sanitize input data
$input_data = filter_input(INPUT_POST, 'input_data', FILTER_SANITIZE_STRING);

// Validate and escape output data
$output_data = htmlspecialchars($output_data, ENT_QUOTES, 'UTF-8');

// Implement proper access controls
if($user->isAdmin()){
    // Allow access to admin features
} else {
    // Redirect unauthorized users
    header("Location: /unauthorized.php");
    exit();
}

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