Problem with Telnet connection

Hi, i´m new to the PHP and i´m having trouble making an telnet connection.

I need to run a script in a remote server, for that script i need to ask the user for a string,
once i have the string i make the telnet connection to the remote server, authenticate and execute
the script.

i´ve try with the fsockopen but i cant get the times right for the authentication, and i haven´t been able to ask the
user for the string save it in a variable and use that variable in the remote server after the telnet..

All the ideas will be most welcome...

Thanks..