PHP 忒聊 綴豖 ヶ輛 shmop_open (PHP 4 = 4.0.4) Description shmop_open() can create or open a shared memory block. shmop_open() takes 4 parameters: key, which is the system's id for the shared memory block, this parameter can be passed as a decimal or hex. The second parameter are the flags that you can use: "a" for access (sets SHM_RDONLY for shmat) use this flag when you need to open an existing shared memory segment for read only "c" for create (sets IPC_CREATE) use this flag when you need to create a new shared memory segment or if a segment with the same key exists, try to open it for read and write "w" for read write access use this flag when you need to read and write to a shared memory segment, use this flag in most cases. "n" create a new memory segment (sets IPC_CREATE|IPC_EXCL) use this flag when you want to create a new shared memory segment but if one already exists with the same flag, fail. This is useful for security purposes, using this you can prevent race condition exploits. 蛁: Note: the 3rd and 4th should be entered as 0 if you are opening an existing memory segment. On success shmop_open() will return an id that you can use to access the shared memory segment you've created. 瞰赽 1. Create a new shared memory block ?php $shm_id = shmop_open(0x0fff, "c", 0644, 100);? This example opened a shared memory block with a system id of 0x0fff. 綴豖 れ萸 ヶ輛 shmop_delete 奻珨撰 shmop_read