How can errors related to server overload or configuration issues be troubleshooted in a PHP application?

Server overload or configuration issues in a PHP application can be troubleshooted by checking the server logs for any error messages, optimizing the server configuration settings, and implementing caching mechanisms to reduce server load.

// Example code for implementing caching in a PHP application using Memcached

// Connect to Memcached server
$memcached = new Memcached();
$memcached->addServer('localhost', 11211);

// Check if data is already cached
$data = $memcached->get('cached_data');

if (!$data) {
    // If data is not cached, fetch data from database or API
    $data = fetchDataFromDatabaseOrApi();

    // Store data in cache for future use
    $memcached->set('cached_data', $data, 3600); // Cache for 1 hour
}

// Use the cached data in the application
echo $data;