Hi there,
I'll keep it short, no filler and fluff. I have 14+ years of programming and I'm 101% positive I can help you with your task.
I'm so confident because I would not risk a new profile with something I can partially do. In fact, just to test my programming knowledge, you can throw any kind of problem at me right now (not necessarily related to your project) and I'll solve it for you.
For your project and the way you described it, it's not possible to do it that way. PHP ( and JavaScript as well) can only access the cookies related to the domain or the IP address on which it is running. To access all cookies in user's device, computer, system etc you'll need to create a browser extension so in this way you'll have access to all cookies stored in that browser. We can create for you an extension as we're very experienced with creating Chrome and Mozilla extensions.
When you're available, please ping me so that we can discuss further and get this done ASAP. Please note that the bid value I made was just to get your attention. After we have all details and we make sure we're 100% on the same page, we'll agree on the final price.
Looking forward to helping your reach your goals and build a great business relationship.
Regards,
Kalin