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Your question has three parts. So let me divide the answer into three parts...
1. Yes, he can work easily depending on interest.
2.You should always target and learn according to the future but as you wanted to know about the present market in the Middle East. I have no idea about the Middle East but My friend who works as Full stack developer in the Middle East told me that Asp is the best in the Middle East right now.
3.ASPNET -> Solutions for IT Departments and Departments in large organizations (facing business user inside these departments)/ Medium Sized Enterprise Applications
PHP -> Small to Medium Sized Web Solutions (facing end consumers
