Overview
This is actually a group of three extensions to PHP that enable access to shared memory using the System V IPC (InterProcess Communication) model.
These functions are available only on systems that support System V-style shared memory. This includes most modern UNIX variants—Linux and Solaris, for instance—but not systems such as Windows.
Note that this chapter is not intended to be an introduction to SysV IPC programming, so if you’re new to the topic you may want to check out some web sites that address it. Much of the information available will deal with IPC in the C language, but the basic ideas can also be applied to IPC in PHP. A good introductory resource is Beej’s Guide to Unix Interprocess Communication (www.ecst.csuchico.edu/~beej/guide/ipc/ ...
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