CentOS 6.2 64bit Installation Steps:
1. download the libssh2 package from http://libssh2.org, command as following:
tar vxzf libssh2-1.4.2.tar.gz
cd libssh2-1.4.2
./configure
make
make install
2. download the php-ssh2 package from http://pecl.php.net/package/ssh2:
tar vxzf ssh2-0.11.3
cd ssh2-0.11.3
phpize
./configure --with-ssh2
make
make install
and the ssh2.so file will copy into /usr/lib64/php/modules
check it.
3. modify the php.ini
vi /etc/php.ini
add the "extension=ssh2.so" to the extension part of php.ini
4. check the environment of php, use phpinfo();
5. enjoy