Code:
r = read
w = write
s = speak
u = understand
n = native
* = incompatible to most people

English    r w s u n
German     r w s u 
* C++      r w   u n
* HTML     r w   u
* PHP      r w   u n
* JS       r w   u
* ASP      r w   u
* Perl     r w   u