Look let's put it like this.
PHP is harder to learn than other languages, for the simple fact that most PHP coders are freelancers, and so are the tutorial writers... So it's very rare to find a good PHP tutorial, and not just some tutorial to attract traffic to a site, you get me?

Deciding you're going to learn programming was a great decision. At least judging by your grammar skills, you seem like an intelligent person, and intelligent people love programming. It'll become part of you once you're inside the club... But it's pretty difficult to get in it.

If you want to make $50 here, $100 there, then learn PHP.
If you want to work as a programmer and earn up to $5,000, $10,000 a month then look into C# and .NET.

Let me guarantee one thing...
It's would be more difficult to move to C# from PHP than vice versa.

That's because of the fact that PHP dismisses variable types and such, and for the fact that it isn't an OOP language by default, but OOP is one of the most important aspects of good programming, and all serious coders out there use it for anything... Not only big projects, which I see a lot of people here tend to say... That's sad, in my opinion. It just states that they don't know much about objects and classes.

C# will teach you everything you need to know and a lot of other cool stuff you may not need to know, but you'll want to know.

And look... I started with PHP... It was pretty difficult, but after a week I got the hang of it and started making little scripts here and there. Basically, I thought I became a PHP guru...

Now I learn C# in college and I'm implementing all of the great stuff there that's so easy to understand into PHP.

But it IS possible to just learn PHP and put a lot of time and effort into it and become good at it.

To sum it all up:
PHP = Small, but more reachable cash.
C# = May not be THAT easy to get a job, but once you get one you're fixed... Unless you try to implement a virus into the corporate system and then you get fired, sued and god knows what else.