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Changes between Initial Version and Version 1 of Ticket #38316, comment 3

initial	v1
4	4	I'll be glad to.
5	5
6		'''sysvshm''' and '''shmop''' extensions are basically wrappers around the *nix System V IPC shared memory subsystem. They basically wrap the same low level functions, but differ in level of abstraction. The sysvshm extension uses a proprietary format for storing and reading shared memory blocks, which makes it impossible to use IPC shared memory blocks created by external non-PHP processes. The shmop extension is more low level, allowing you to store ~~raw data in~~ a shared memory block.
	6	'''sysvshm''' and '''shmop''' extensions are basically wrappers around the *nix System V IPC shared memory subsystem. They basically wrap the same low level functions, but differ in level of abstraction. The sysvshm extension uses a proprietary format for storing and reading shared memory blocks, which makes it impossible to use IPC shared memory blocks created by external non-PHP processes. The shmop extension is more low level, allowing you to store and read raw data into a shared memory block.
7	7
8	8	'''sysvsem''' extension basically implements System V semaphores. Frequently used for establishing critical paths in a multithreaded environment. PHP does not support native multithreading, but with forking it is possible to have multiple threads active, albeit in different processes.