Is there any limit for shared memory(shmop) block system id (PHP)
<p>i am creating an app that must check(count) users'(write-intensive) requests.</p>

<p>'shmop_open(MY_INT_USER_ID, ... )' returns a system ID for shared access but i am not sure about this, is there any limitation for shmop system IDs on 64-bit OS? Or does this cause problems, such as collisions?</p>
