memcache.php

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<?php
function is_memcache_available() {
    global $CONFIG;

    static $memcache_available;

    if ((!isset($CONFIG->memcache)) || (!$CONFIG->memcache)) {
        return false;
    }

    // If we haven't set variable to something
    if (($memcache_available !== true) && ($memcache_available !== false)) {
        try {
            $tmp = new ElggMemcache();
            // No exception thrown so we have memcache available
            $memcache_available = true;
        } catch (Exception $e) {
            $memcache_available = false;
        }
    }

    return $memcache_available;
}

function _elgg_invalidate_memcache_for_entity($entity_guid) {
    static $newentity_cache;
    
    if ((!$newentity_cache) && (is_memcache_available())) {
        $newentity_cache = new ElggMemcache('new_entity_cache');
    }
    
    if ($newentity_cache) {
        $newentity_cache->delete($entity_guid);
    }
}