What caching measures can be implemented on the server side to optimize performance when multiple clients access the same PHP script?

When multiple clients access the same PHP script, server-side caching measures can be implemented to optimize performance. One common approach is to use opcode caching, which stores compiled PHP code in memory to avoid recompiling the script on each request. Another option is to implement data caching, where frequently accessed data is stored in memory or a separate caching system to reduce database queries and improve response times. 

// Example of implementing opcode caching with OPcache
if (extension_loaded('Zend OPcache')) {
    ini_set('opcache.enable', 1);
    ini_set('opcache.enable_cli', 1);
}

// Example of implementing data caching with Memcached
$memcached = new Memcached();
$memcached->addServer('localhost', 11211);

$key = 'cached_data';
$data = $memcached->get($key);

if (!$data) {
    // Fetch data from database or perform expensive operation
    $data = fetchDataFromDatabase();

    // Cache the data for future requests
    $memcached->set($key, $data, 3600); // Cache for 1 hour
}

// Use the cached data
echo $data;

Keywords

caching server-side performance optimization PHP script multiple clients

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