PHP Cache

php_cache-demo.php

<?
require_once "php_cache.php";

echo 123456;
phpinfo();

php_cache.php

<?
$CACHE_ON               = true;
$CACHE_METHOD           = "memcached";

// Filecache stuff...
$CACHE_DIRECTORY        = "/dev/shm/" . "page_cache_";

// Memcache stuff...
$CACHE_KEY              = "page_cache_";
$CACHE_HANDLE           = NULL;
$CACHE_TIME             = 60;

// =================================================================
// Memcached cache
// =================================================================

function memcached_cache_connect(){
        global $CACHE_HANDLE;

        $CACHE_HANDLE = new Memcached();

        if (! $CACHE_HANDLE->addServer('localhost', 11211) )
                return false;

        $CACHE_HANDLE->setOption(Memcached::OPT_NO_BLOCK,               true    );
        $CACHE_HANDLE->setOption(Memcached::OPT_TCP_NODELAY,            true    );
        $CACHE_HANDLE->setOption(Memcached::OPT_POLL_TIMEOUT,           100     );
        $CACHE_HANDLE->setOption(Memcached::OPT_RETRY_TIMEOUT,          1       );
        $CACHE_HANDLE->setOption(Memcached::OPT_CONNECT_TIMEOUT,        100     );

        return true;
}

function memcached_cache_key(){
        global $CACHE_KEY;

        return $CACHE_KEY . md5(
                $_SERVER["HTTP_HOST"] .
                $_SERVER["REQUEST_URI"] .
                $_SERVER["QUERY_STRING"] .
        //      $_SERVER["HTTP_USER_AGENT"] .
                ""
        );
}

function memcached_cache_load($key){
        global $CACHE_HANDLE;

        if ( ! @memcached_cache_connect())
                return false;

        return $CACHE_HANDLE->get($key);
}

function memcached_cache_save($key, $data){
        global $CACHE_HANDLE;
        global $CACHE_TIME;

        if ( ! @memcached_cache_connect())
                return false;

        return $CACHE_HANDLE->set($key, $data, $CACHE_TIME);
}

// =================================================================
// File cache
// =================================================================

function file_cache_key(){
        global $CACHE_DIRECTORY;

        return $CACHE_DIRECTORY . md5(
                $_SERVER["HTTP_HOST"] .
                $_SERVER["REQUEST_URI"] .
                $_SERVER["QUERY_STRING"] .
        //      $_SERVER["HTTP_USER_AGENT"] .
                ""
        );
}

function file_cache_load($key){
        return @file_get_contents($key);
}

function file_cache_save($key, $data){
        return @file_put_contents($key, $data);
}

// =================================================================

function cache_key(){
        global $CACHE_METHOD;
        $fn_cache_key = "{$CACHE_METHOD}_cache_key";
        return $fn_cache_key();
}

function cache_load($key){
        global $CACHE_METHOD;
        $fn_cache_load = "{$CACHE_METHOD}_cache_load";
        return $fn_cache_load($key);
}

function cache_save($key, $data){
        global $CACHE_METHOD;
        $fn_cache_save = "{$CACHE_METHOD}_cache_save";
        return $fn_cache_save($key, $data);
}

function cache_shutdown(){
        $data = ob_get_contents();

        // Put it into the cache
        cache_save(cache_key(), $data);
}

function cache_start(){
        $out = cache_load(cache_key());

        if ( $out ){
                // Cache hit. Deliver the page.
                echo $out;
                exit;
        }

        register_shutdown_function("cache_shutdown");
        ob_start();
}

if ($CACHE_ON)
        cache_start();

redis_php_cache.php

// Unlike other files, this file is not tested !!!

function redis_cache_connect(){
        global $CACHE_HANDLE;

        $CACHE_HANDLE = new Redis();

        tey{
                $CACHE_HANDLE->connect("127.0.0.1", "6379");
        }catch(Exception $e){
                $CACHE_HANDLE = NULL;
                return false;
        }

        return true;
}

function redis_cache_key(){
        global $CACHE_KEY;

        return $CACHE_KEY . md5(
                $_SERVER["HTTP_HOST"] .
                $_SERVER["REQUEST_URI"] .
                $_SERVER["QUERY_STRING"] .
        // $_SERVER["HTTP_USER_AGENT"] .
                ""
        );
}


function redis_cache_load($key){
        global $CACHE_HANDLE;

        if ( ! @redis_cache_connect())
                return false;

        return $CACHE_HANDLE->get($key);
}

function redis_cache_save($key, $data){
        global $CACHE_HANDLE;
        global $CACHE_TIME;

        if ( ! @redis_cache_connect())
                return false;

        return $CACHE_HANDLE->set($key, $data);
        return $CACHE_HANDLE->expire($key, $CACHE_TIME);
}