Yii+nginx+linux+php-fpm 搭建环境出现错误 [ 2.0 版本 ]

错误日志：

2015/01/29 18:45:10 [error] 14499#0: *104 FastCGI sent in stderr: "PHP message: PHP Parse error: syntax error, unexpected '[', expecting ')' in /opt/webroot/dianshangwebroot/web/vendor/yiisoft/yii2/Yii.php on line 25" while reading response header from upstream, client: 123.160.185.237, server: www.domain.com, request: "GET / HTTP/1.1", upstream: "fastcgi://127.0.0.1:9999", host: "www.domain.com"

Yii文件代码没有错误：

<?php
/**
 * Yii bootstrap file.
 *
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

require(__DIR__ . '/BaseYii.php');

/**
 * Yii is a helper class serving common framework functionalities.
 *
 * It extends from [[\yii\BaseYii]] which provides the actual implementation.
 * By writing your own Yii class, you can customize some functionalities of [[\yii\BaseYii]].
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @since 2.0
 */
class Yii extends \yii\BaseYii
{
}

spl_autoload_register(['Yii', 'autoload'], true, true);
Yii::$classMap = include(__DIR__ . '/classes.php');
Yii::$container = new yii\di\Container;