This code doesn’t work. I set up a full fledged example based on the reading from comments by Robert who linked a lua and php discussion/documentation. Note, those are independent sources, so…

producer.lua

local shmem = require("shmem")
local mem = shmem.new(1024)
body = "some kind of test" 
mem:write(body) 

consumer.php

<?php 
$shm_id = shmop_open(0xff3,"c",0644,1024); 
if (!$shm_id) { echo "couldn't create shared memory segment`n"; } 
$shm_size = shmop_size($shm_id); 
$mystring = shmop_read($shm_id, 0, $shm_size); 
echo $mystring . "ipsum lorem" . $mystring 
shmop_close($shm_id); ?>  

And that is end of file. Of course the only thing output by php is ipsum lorem. I would have expected “some kind of testipsumloremsome kind of test”.

Note, I’d love a universal and dynamic system beyond the scope of lua and php, however, that is the framework I had tried to work within and because we need a narrow scope I will ask for an answer that applies to just this. Cheers