PHP application memory and singleton

Question

Does PHP have application memory like Java does or is it like a blank "memory" canvas for each stateless connection request (i.e. from each user)?

What I'm trying to confirm is, if I use a singleton pattern to hold data, is the instance ever shared between different users in PHP or would there be a different single instance created for each user?

If I use... $singInst = mySingleton::getInstance(); $singInst->holdA(5); $singInst->holdB(9); echo $singInst->getA();

Is the singleton ever shared between visiting users if required? i.e. call to singInst->getA() could return a value set from another user's script execution?

A singleton is single to a http request, it is not shared between multiple requests, so it cannot be set by one user's request and accessed by another user's request — Mark Baker
– Mark Baker, Commented Sep 15, 2014 at 15:21

David Chan · Accepted Answer · 2014-09-15 15:25:51Z

2

every instance of PHP runs in it's own VM (virtual memory) which is separate from all other PHP processes VMs and mapped to physical memory by the OS, the PHP instance has the illusion of having access to the entire memory.

so no you cannot see another users singleton.

answered Sep 15, 2014 at 15:25

David Chan

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