shmop_read

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

shmop_read — Read data from shared memory block

说明

shmop_read ( resource $shmid , int $start , int $count ) : string

shmop_read() will read a string from shared memory block.

参数

shmid

The shared memory block identifier created by shmop_open()

start

Offset from which to start reading

count

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
7.0.0 The type of shmid has been changed from int to resource.

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

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