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# shmop_read

(PHP 4 >= 4.0.4, PHP 5)

shmop_read -- Read data from shared memory block

## 说明

string shmop_read ( int shmid, int start, int count )

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

## 返回值

Returns the data or `FALSE` on failure.

## 范例

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`.

## 参见

shmop_write()

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