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Editorial Team
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Asked: 2026-05-27T00:42:36+00:00

There is a long-lived PHP process, which supports signals ( SIGHUP etc.) and another

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There is a long-lived PHP process, which supports signals (SIGHUP etc.) and another PHP process needs to know the PID of the first one to send a signal.

I’d like to set an environment variable, which would be read in the second (client) process and used for my purposes, but putenv(...posix_getpid()...) doesn’t seem to make it visible to another process.

How do I make an environment variable, set in one PHP process, visible to another? If that’s impossible, what’s the preferred way (I’d like not to use files or db for this)?

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1 Answer

  1. Editorial Team

    What you are talking about is Inter-Process Communication (IPC). Solutions include using a socket, a named pipe, a file, redis, some message bus/queue, etc. This is a common and complex problem in software development, and one with many many robust options.

    Sounds like a simple file would work fine for you and is probably the… simplest.

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