PHP ImThumb::MBSTRING_SHADOW示例

        }
        $tryFile = '/imthumb-source-' . strtolower(str_replace('ImThumbSource_', '', $class)) . '.class.php';
        if (file_exists(IMTHUMB_BASE . $tryFile)) {
            require_once IMTHUMB_BASE . $tryFile;
            return true;
        }
        if ($this->params['extraSourceHandlerPath'] && file_exists($this->params['extraSourceHandlerPath'] . $tryFile)) {
            require_once $this->params['extraSourceHandlerPath'] . $tryFile;
            return true;
        }
        return false;
    }
    //--------------------------------------------------------------------------
    // Rate limiting
    /**
     * @return true if rate is OK, false if exceeded
     */
    public function checkRateLimits()
    {
        if ($limiter = $this->param('rateLimiter')) {
            $limiter->setGenerator($this);
            if (!$limiter->checkRateLimits()) {
                return false;
            }
        }
        return true;
    }
}
ImThumb::$HAS_MBSTRING = extension_loaded('mbstring');
ImThumb::$MBSTRING_SHADOW = (int) ini_get('mbstring.func_overload');