shm_attach Creates or open a shared memory segment &reftitle.description; resourceshm_attach intkey intmemsize intperm0666 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. &reftitle.parameters; key A numeric shared memory segment ID memsize The memory size. If not provided, default to the sysvshm.init_mem in the &php.ini;, otherwise 10000 bytes. perm The optional permission bits. Default to 0666. &reftitle.returnvalues; Returns a shared memory segment identifier. &reftitle.changelog; &Version; &Description; 5.3.0 This function now returns a &resource; instead of an integer. &reftitle.notes; This function used to return an integer value prior to PHP 5.3.0. To achieve the same value in a portable manner, the return value can be cast to an integer like: ]]> &reftitle.seealso; shm_detach ftok