zez.org: Inter-Process Communication in PHP
February 3, 2001
"In this article I'm going to discuss the use of IPC (Inter-Process-Communication) mechanisms from PHP4...."
"IPC (Inter-process communication) is a standard Unix mechanism to communicate processes in the same machine, basically IPC defines 3 different ways of communication: message queues, shared memory and semaphores. We are going to discuss shared memory and semaphores in this article...."
"The use of shared memory segments is a very good way to communicate between processes, basically you define a memory segment that can be shared between processes, if a process writes to the memory with some data the other processes can see it. In PHP you can for example control, for example the number of processes running, or put some data in memory to prevent all the php scripts from doing the same thing, generating the same result."