src/ClassLoader.php
private static function findClassFileOnCache($className) {
        // search it in cache first
        $cacheKey = $className . "_path";
        if (extension_loaded('apc') ) {
            $filePath = apc_fetch($cacheKey);
            return $filePath;            
        }
        return null;     
    }
private static function findClassFileOnCache($className) {
        // search it in cache first
        $cacheKey = $className . "_path";
        if (extension_loaded('apc') ) {
            $filePath = apc_fetch($cacheKey);
            return $filePath;            
        }
        return null;     
    }
Find class file location from cache dictionary.
@param type $className
@return string|null full path filename if found or null if not found