My GVIM 7.3.46 install on Windows XP Professional SP3 32bit does not seem to have PHP syntax highlighting. I have added this file to C:\Documents and Settings\myUsername\vimfiles\syntax and set this in VIM:
au! Syntax php source C:\Documents and Settings\dotancohen\vimfiles\syntax\vim.php
However, running set syntax=php does not highlight files as PHP, neither for files with the .php extension nor for no-extension files.
How can I fix this?