I'm all about the PHP. C++ is good, C is hard to deal with the pointers and stuff, and C# is just a pathetic m$ attempt at Java.
Nono, let me rephrase that for SR: I believe that C# is a microsoft alias to Java, but I deeply respect those users of C# and the lovers of M$.
PHP is sleek, fast, object oriented, high level, easy to use, network easy...it's everything you want in a high level language. For down and dirty work on OS stuff, I go for the C though.