Shmop is an easy to use set of functions that allows PHP to read,
write, create and delete Unix shared memory segments.
Note:
Versions of Windows previous to Windows 2000 do not support shared memory.
Under Windows, Shmop will only work when PHP is running as a web server
module, such as Apache or IIS (CLI and CGI will not work).
Note:
In PHP 4.0.3, these functions were prefixed by shm
rather than shmop.