Yea, far more web developers know PHP than Ruby or Python.
Python devs don't necessarily know web development, and Ruby is pretty old-school (I don't mean that in a bad way, it's just not what they teach these days and not as applicable outside of web development).
Python devs don't necessarily know web development, and Ruby is pretty old-school (I don't mean that in a bad way, it's just not what they teach these days and not as applicable outside of web development).