错误致命错误:在(Env: PHP版本5.6.6,Windows7和IIS7)中调用未定义函数ssh2_connect()

I am not able to work with ss2_connect(). I have copied all libssh2.dll and php_ssh2.dll to php\ext folder also uncommented extension=php_ssh2.dll. I am not able to work with ss2_connect(). I hav