shmop_read

(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)

shmop_read — Read data from shared memory block

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

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

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.

Returns the data 或者在失败时返回 false.

版本	说明
8.0.0	`shmop` expects a Shmop instance now; previously, a resource was expected.

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.