Tons of PHP programmers out there and they're a dime a dozen.
As one who worked freelance for years, to add to this, the reason there are so many PHP programmers is it's so easy to learn. Too easy, IMO, and is a demonstration of "a little bit of knowledge is dangerous." Look around at many of the posts here - developers go straight from the tutorials to selling the services, without learning the basics of programming or security practices.
This may sound pompous and elitist but it's not, everyone has to start somewhere, I did. But I started with my own projects first and it was a couple years before I really had a grip on what I was doing. I still wonder about it sometimes. :-)