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Creates or open a shared memory segment (PHP 4, PHP 5)
int shm_attach ( int key [, int memsize [, int perm]] )

shm_attach() returns an id 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 and the optional perm-bits perm.

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.



The memory size. If not provided, default to the sysvshm.init_mem in the php.ini, otherwise 10000 bytes.


The optional permission bits. Default to 0666.

Return Values

Returns a shared memory segment identifier.