cd /var/lib/php5
find . -name "sess_*" -print | xargs rm -v

针对Ubuntu，在php.ini中设置session.gc_probability的值为1， 因为Ubuntu默认该值为0

下载Phantomjs：http://phantomjs.org/download.html

解压到：/Users/UFO/

打开terminal，输入命令：export PATH="$PATH:/Users/UFO/phantomjs-2.1.1-macosx/bin/"

测试：phantomjs -v

看到具体的版本号，则表示安装成功

cd~

curl -sS https://getcomposer.org/installer | php

php composer.phar

1．给子域名加www标记 RewriteCond %{HTTP_HOST} ^([a-z.]+)?example\.com$ [NC] RewriteCond %{HTTP_HOST} !^www\. [NC] RewriteRule .? http://www.xample.com%{REQUEST_URI} [R=301,L] 这个规则抓取二级域名的%1变量，如果不是以www开始，那么就加www，以前的域名以及{REQUEST_URI}会跟在其后。

Before You Begin

1. Ensure that you have followed the Getting Started and Securing Your Server guides, and the Linode’s hostname is set.To check your hostname run:

   1 2	hostname hostname -f

   The first command should show your short hostname, and the second should show your fully qualified domain name (FQDN).
2. Update your system:

   1	sudo apt-get update && sudo apt-get upgrade

update la6y3_content a,la6y3_k2_items b set b.alias=a.alias where b.title=a.title

修改数据库字符集：

ALTER DATABASE db_name DEFAULT CHARACTER SET character_name [COLLATE ...];