Virginia Schuett has created a phe book that lists foods and all their phe content. Because you live in Iran, I am not sure if you will be able to purchase the book, but it is always worth a try! Go to myspecialdiet.com and click the link that says 'Now Open Store Online.' This will take you to the online store. In the section that says Books and Software select books and the phe book is the Low Protein Food List for PKU.
If you cannot get this, because you live out of the US you may need to speak with your sons doctor or dietitian. Otherwise you can contact Virginia Schuett directly and see if she could possibly help you. I think her contact information is on her website at pkunews.org