Here's a link to the compiler:
http://phpuser.com/download/files/dev-tool/phpcompiler/
Few things to keep in mind....
1) It isn't a "compiler", it's an overlay manager. Basically, it tacks the script you're "compiling" onto the end of a copy of php.exe. All related dll's and php.ini must be distributed in addition to the generated exe file
2) I don't think this will work for webpages. It was designed mainly for Win32 shell scripting using PHP and for PHP-GTK apps. Both run as client processes and stand-alone applications on the end-users computer.
3) Version 0.0.2-beta (the latest version available) is limited to how big a file it can append to php.exe. My own experimentation has shown that limit to be approx. 200 lines (or about 8 - 10 kb). Beyond that size and you need to call code in with an include() or require() (ie. it's not appended to the exe and is in plain text source code). This kinda defeats the purpose you're looking to achieve🙂
4) Plot (the developer) seems to have completely dropped off the radar screen, so consider this a dead project with little to no hope of support.
HTH.
Cheers,
Geoff A. Virgo