Sending SSH or Telnet command via a php page?

Hi, I'm running a Minecraft server and I would like to have a admin access via a PHP so I could restart stop the server etc. I have the possibility to have enable a telnet access to the server or use the SSH access. The problem is that the telnet access will be diasabled after a server crash because it's a plugin that create that. So I would prefer to send ssh command via the php page. What I need to send is pretty simple. I need to send as user minecraft the command ".stop" in a screen session called "mc". I tried that via php but I realised that the page (www-data) was unable to change user to minecraft so how can I do this? I'm not a expert in php neither so if you would give me some example that could be nice! Thanks guys!

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