   #PHP Manual Semaphore, Shared Memory and IPC Functions sem_remove
   shm_detach

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                                  shm_attach

   (PHP 3>= 3.0.6, PHP 4 )
   shm_attach -- Creates or open a shared memory segment

Description

   int shm_attach ( int key [, int memsize [, int perm]])

   shm_attach() returns an id that that can be used to access the System
   V shared memory with the given key, the first call creates the shared
   memory segment with memsize (default: sysvshm.init_mem in the php.ini,
   otherwise 10000 bytes) and the optional perm-bits perm (default:
   0666).

   A second call to shm_attach() for the same key will return a different
   shared memory identifier, but both identifiers access the same
   underlying shared memory. Memsize and perm will be ignored.

   See also: ftok().

     Note: This function does not work on Windows systems.
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