(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
shmop_read — Read data from shared memory block
shmop_read() will read a string from shared memory block.
The shared memory block identifier created by shmop_open()
Offset from which to start reading
The number of bytes to read.
shmop_size($shmid) - $start bytes.
Returns the data 或者在失败时返回
示例 #1 Reading shared memory block
$shm_data = shmop_read($shm_id, 0, 50);
This example will read 50 bytes from shared memory block and place the data