In what ways can the use of PHP's cURL function enhance the security and functionality of a web proxy server implementation?

Using PHP's cURL function can enhance the security and functionality of a web proxy server implementation by allowing for secure communication with external servers, handling various protocols, and providing options for custom headers and authentication methods.

// Initialize cURL session
$ch = curl_init();

// Set cURL options
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);

// Execute cURL session
$response = curl_exec($ch);

// Close cURL session
curl_close($ch);

// Output the response
echo $response;