ALIOSS::log PHP 메소드

    private function log($msg)
    {
        if (defined('ALI_LOG_PATH')) {
            $log_path = ALI_LOG_PATH;
            if (empty($log_path) || !file_exists($log_path)) {
                throw new OSS_Exception($log_path . OSS_LOG_PATH_NOT_EXIST);
            }
        } else {
            $log_path = dirname(__FILE__) . DIRECTORY_SEPARATOR . 'logs' . DIRECTORY_SEPARATOR;
        }
        //检测日志目录是否存在
        if (!file_exists($log_path)) {
            throw new OSS_Exception(OSS_LOG_PATH_NOT_EXIST);
        }
        $log_name = $log_path . 'oss_sdk_php_' . date('Y-m-d') . '.log';
        if (ALI_DISPLAY_LOG) {
            echo $msg . "\n<br/>";
        }
        if (ALI_LOG) {
            if (!error_log(date('Y-m-d H:i:s') . " : " . $msg . "\n", 3, $log_name)) {
                throw new OSS_Exception(OSS_WRITE_LOG_TO_FILE_FAILED);
            }
        }
    }