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(PHP 4, PHP 5)

shm_attach — Creates or open a shared memory segment


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.

See Also