<?php if (!defined('CACHE_TYPE')) { define('CACHE_TYPE', 'NONE'); } # Check if APC extension is loaded, and set cache prefix if it is. if (CACHE_TYPE == 'APC' && !defined('EXTENSION_LOADED_APC')) { define('EXTENSION_LOADED_APC', extension_loaded('apc')); define('CACHE_PREFIX', 'aur:'); } # Check if memcache extension is loaded, and set cache prefix if it is. if (CACHE_TYPE == 'MEMCACHE' && !defined('EXTENSION_LOADED_MEMCACHE')) { define('EXTENSION_LOADED_MEMCACHE', extension_loaded('memcached')); define('CACHE_PREFIX', 'aur:'); global $memcache; $memcache = new Memcached(); $mcs = defined('MEMCACHE_SERVERS') ? MEMCACHE_SERVERS : '127.0.0.1:11211'; foreach (explode(',', $mcs) as $elem) { $telem = trim($elem); $mcserver = explode(':', $telem); $memcache->addServer($mcserver[0], intval($mcserver[1])); } } # Set a value in the cache (currently APC) if cache is available for use. If # not available, this becomes effectively a no-op (return value is # false). Accepts an optional TTL (defaults to 600 seconds). function set_cache_value($key, $value, $ttl=600) { $status = false; if (defined('EXTENSION_LOADED_APC')) { $status = apc_store(CACHE_PREFIX.$key, $value, $ttl); } if (defined('EXTENSION_LOADED_MEMCACHE')) { global $memcache; $status = $memcache->set(CACHE_PREFIX.$key, $value, $ttl); } return $status; } # Get a value from the cache (currently APC) if cache is available for use. If # not available, this returns false (optionally sets passed in variable $status # to false, much like apc_fetch() behaves). This allows for testing the fetch # result appropriately even in the event that a 'false' value was the value in # the cache. function get_cache_value($key, &$status=false) { if(defined('EXTENSION_LOADED_APC')) { $ret = apc_fetch(CACHE_PREFIX.$key, $status); if ($status) { return $ret; } } if (defined('EXTENSION_LOADED_MEMCACHE')) { global $memcache; $ret = $memcache->get(CACHE_PREFIX.$key); if (!$ret) { $status = false; } else { $status = true; } return $ret; } return $status; } # Run a simple db query, retrieving and/or caching the value if APC is # available for use. Accepts an optional TTL value (defaults to 600 seconds). function db_cache_value($dbq, $key, $ttl=600) { $dbh = DB::connect(); $status = false; $value = get_cache_value($key, $status); if (!$status) { $result = $dbh->query($dbq); $row = $result->fetch(PDO::FETCH_NUM); $value = $row[0]; set_cache_value($key, $value, $ttl); } return $value; } ?>