Does it matter which country I am in to pursue this dive?
The best thing about studying PHP is that no matter where you are in the world, you can quite easily improve your PHP skills. As long as you have access to a laptop, you will be able to practice your skills, improving every day.

Bottom line, the answer is no: it doesn't matter at all which country you are in. Wherever you are, you can start learning or improve your PHP skills. Truly, these days, if you want to become an expert at PHP, and you aren't an expert yet, the only reason is: "You are not putting enough effort." 

Remember the Break Diver's Creed: No Rules. No Excuses. No Regrets.