In what ways can a PHP developer optimize the performance of a website that includes a Whois query feature?

One way a PHP developer can optimize the performance of a website that includes a Whois query feature is by implementing caching for the results of the queries. By storing the results of previous queries in a cache, the website can quickly retrieve the information without having to make repeated requests to the Whois server, thus reducing the load on the server and improving the overall performance of the website.

// Check if the result is already cached
$cacheKey = 'whois_' . $domainName;
$cachedResult = apc_fetch($cacheKey);

if ($cachedResult) {
    // Use the cached result
    $whoisResult = $cachedResult;
} else {
    // Perform the Whois query
    $whoisResult = whois_query($domainName);
    
    // Cache the result for future use
    apc_store($cacheKey, $whoisResult, 3600); // Cache for 1 hour
}

// Display the Whois information
echo $whoisResult;