ssh2(secure shell2)，对于远端主机提供高安全性的资料传输工作。
安装：
1、首先要装OpenSSL。
2、要安装 libssh2.
./configure && make all install
3、再然后，安装PECL/ssh2
可以使用 pear install ssh2安装（有的说是 pear install ssh2-beta）
也可以到 PECL/SSH2 下载源码安装
phpize && ./configure ?with-ssh2 && make
4、在 php.ini中加入 extension=ssh2.so
5、重启 服务器。
这样，php 的 ssh2扩展即安装成功。
#php -m查看下，是否加载进来了。呵呵
下一篇我们将介绍php使用 ssh2扩展进行安全的资料传输。
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