These requirements are really muddy. It's difficult to follow the logic, because you should be able to set the value of a dropdown through whatever you're doing in you PHP snippet. You need to answer the following requirements elicitation questions as completely as possible:
1. How are you creating the form entry?
2. You say you have a link, how is the link getting created? For what purpose? How is the link disseminated and to whom?
3. What does the PHP script do? Please create a pastebin for your code and post the pastebin link back here so we can examine the code.
4. This is the muddiest part of your post. What form is Field02 on?
5. It sounds like that after Field01 is populated, you want to run another process that takes the value of Field01 and look up a matching entry in Form02 and retrieve the value of some field in Form02 and populate Field02 on Form01?
You really need to be specific with what you are trying to do, because right now, I don't know how to answer your question.
I'm referring you to this column I published yesterday. It's all about capturing good requirements. https://formidable-masterminds.com/be-careful-what-you-ask-for/
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