Send variables from php to dll and back.

I'm trying to call a VB DLL to run validation checks on user input. I know nothing of VB, or even how to call a DLL for something like this, so I'm going to need to be shown like a newbie. I've already read over Luiz Fernando's request and responses, and they didn't seem to help me. For example, I need to send: $string="Hello World"; $string2="This/Would/Fail"> $string3="Test 3"; $string4="Test%5"; <script sends $string to helloworld.dll> .DLL grabs the string, validates it, and sends back the variables that passed, and the variables that failed. IE: $passed="string, string3"; $failed="string2, string4"; Any ideas how I would go about sending this information to the .dll and returning it? Thanks in advance! Ryan