Turck MMCache is a free open source PHP accelerator, optimizer, encoder and dynamic content cache for PHP.
It increases performance of PHP scripts by caching them in compiled state, so that the overhead of compiling is almost completely eliminated. Also it uses some optimizations to speed up execution of PHP scripts.
Turck MMCache typically reduces server load and increases the speed of your PHP code by 1-10 times.
Turck MMCache stores compiled PHP scripts in shared memory and execute code directly from it. It creates locks only for short time while search compiled PHP script in the cache, so one script can be executed simultaneously by several engines.
Turck MMCache contains a PHP encoder and loader. You can encode PHP scripts using encoder.php in order to distribute them without sources.
Encoded files can be run on any site which runs PHP with Turck MMCache 2.3.10 or above. The sources of encoded scripts can't be restored because they are stored in a compiled form and the encoded version doesn't contain the source.
Of course, some internals of the scripts can be restored with different reverse engineering tools (disassemblers, debuggers, etc), but it is not trivial.
· apache 1.3, mod_php 4.1, autoconf, automake, libtool, m4