shmop_read
(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
shmop_read — Read data from shared memory block
说明
shmop_read() will read a string from shared memory block.
参数
-
shmop
-
The shared memory block identifier created by shmop_open()
-
offset
-
Offset from which to start reading
-
size
-
The number of bytes to read.
0
readsshmop_size($shmid) - $start
bytes.
返回值
Returns the data 或者在失败时返回 false
.
更新日志
版本 | 说明 |
---|---|
8.0.0 |
shmop expects a Shmop
instance now; previously, a resource was expected.
|
范例
示例 #1 Reading shared memory block
<?php
$shm_data = shmop_read($shm_id, 0, 50);
?>
This example will read 50 bytes from shared memory block and place the data
inside $shm_data
.