php shmop 内存读写操作

shmop php在linux上操作共享内存的函数

关于php操作内存,我选择了shmop扩展,其方法只有6个:

shmop_open 打开内存块.

shmop_write 向内存块中写入数据

shmop_size 获得内存块大小

shmop_read 读取内存块数据

shmop_delete 删除内存块数据

shmop_close 关闭内存块

<?php

class shared {

private $shm_id;
private $shm_key = 0xff3;
private $shm_size = 1024;

function __construct() {
$this->shm_id = shmop_open($this->shm_key, "c", 0644, $this->shm_size) or die('申请失败');
}

function __get($name) {
$buf = shmop_read($this->shm_id, 0, $this->shm_size);
$buf = unserialize(trim($buf));
if ($name == '_all')
return $buf;
return isset($buf[$name]) ? $buf[$name] : false;
}

function __set($name, $value) {
$buf = shmop_read($this->shm_id, 0, $this->shm_size);
$buf = unserialize(trim($buf));
$buf[$name] = $value;
$buf = serialize($buf);
if (strlen($buf) >= $this->shm_size)
die('空间不足');
shmop_write($this->shm_id, $buf, 0) or die('写入失败');
}

function del() {
shmop_delete($this->shm_id);
}

}

$shmopobj = new shared();

if (isset($shmopobj->database) || $shmopobj->database == null) {
echo "input memory";
echo "</br>";
$shmopobj->database = "localhost";
} else {
echo "get data";
echo "</br>";
echo $shmopobj->database;
}
//$shmopobj->del();
?>

第一次刷新页面，输出

input memory

第二次刷新页面，输出

get data
localhost

然后可以调用

$shmopobj->del();删除该内存数据