Tutorial: Cross-platform background process forking without extensions in PHP

There are plenty of ways to fork new processes in PHP. You can use shell functions like exec() or shell(), the pcntl_* function set in the Process Control extension or stream/filesystem functions such as popen(). In this article, we’re going to look at the latter of these, and learn:

• How to make it work on both Windows and Linux
• How to make the forked process run in the background
• How to communicate with the forked process
• How to fork more than one process
• How to cleanly terminate the forked process from the parent script

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