环境：Linux环境（Centos or RedHat）
1、确认环境已安装php-5
# rpm -qa|grep php-5
php-5.3.3-48.el6_8.x86_64
2、安装ssh2所依赖的rpm包如下图灰色部分显示，安装顺序可以按照灰色部分显示安装的时间顺序进行安装：
注明：rpm包的版本要根据Linux系统原有包版本去选择，在安装rpm时，如果遇到安装错误，提示缺少依赖，请去检查rpm版本是否符合或去查看所依赖的包是否已安装。
安装所需要的rpm包如下图所示：
libssh2-devel-1.4.2-2.el6_7.1.x86_64
openssl-devel-1.0.1e-48.el6_8.1.x86_64
krb5-devel-1.10.3-57.el6.x86_64
zlib-devel-1.2.3-29.el6.x86_64
libcom_err-devel-1.41.12-22.el6.x86_64
libselinux-devel-2.0.94-7.el6.x86_64
libsepol-devel-2.0.41-4.el6.x86_64
keyutils-libs-devel-1.4-5.el6.x86_64
php-devel-5.3.3-48.el6_8.x86_64
php-pear-1.9.4-5.el6.noarch
automake-1.11.1-4.el6.noarch
autoconf-2.63-5.1.el6.noarch
3、安装ssh2-0.13.tgz
首先下载ssh2的源码包ssh2-0.13.tgz（版本不同可能导致安装失败）
# tar -xvf ssh2-0.13.tgz
# cd ssh2-0.13
# phpize
# ./configure --prefix=/usr/local/ssh2
# make
# make install
4、ssh2扩展在php.ini文件中追加
# vi /etc/php.ini
extension=ssh2.so
# cat /etc/php.ini | grep extension=ss
extension=ssh2.so
#
5、ssh2安装成功确认
# php -m | grep ssh2
ssh2
# php -i | grep ssh2
Registered PHP Streams => https, ftps, compress.zlib, compress.bzip2, php, file, glob, data, http, ftp, ssh2.shell, ssh2.exec, ssh2.tunnel, ssh2.scp, ssh2.sftp, phar, zip
libSSH Version => libssh2/1.4.2
PHP Warning: Unknown: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in Unknown on line 0
ssh2
libssh2 version => 1.4.2
banner => SSH-2.0-libssh2_1.4.2
