AT Commands PHP

I want to send messages from php by using a GSM modem. I have configured the modem and tested it using Hyperterminal. Now I want to execute AT commands using php. Is there any open source library available for that, or some other solution?

Solution

Since my php application is hosted on an Apache webserver, I used python, pyserial and mod_wsgi to send the SMS, thanks for all the help.

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