public SyncSharedMemory::read    ([ int $start = 0   [, int $length  ]] )

SyncSharedMemory::readCopy data from named shared memory

start

The start/offset, in bytes, to begin reading.

Замечание:

If the value is negative, the starting position will begin at the specified number of bytes from the end of the shared memory segment.

length

The number of bytes to read.

Замечание:

If unspecified, reading will stop at the end of the shared memory segment.

If the value is negative, reading will stop the specified number of bytes from the end of the shared memory segment.