Php/docs/function.shmop-read

• PHP Manual
• Shared Memory 函数
• Read data from shared memory block

shmop_read

(PHP 4 >= 4.0.4, PHP 5, PHP 7)

shmop_read — Read data from shared memory block

说明

shmop_read ( Shmop $shmop , int $offset , int $size ) : string

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 reads shmop_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

Example #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.

参见

• shmop_write() - Write data into shared memory block