Shared Memory

简介
安装／配置
预定义常量
范例
- Basic usage
Shared Memory 函数
- shmop_close — Close shared memory block
- shmop_delete — Delete shared memory block
- shmop_open — Create or open shared memory block
- shmop_read — Read data from shared memory block
- shmop_size — Get size of shared memory block
- shmop_write — Write data into shared memory block
Shmop — The Shmop class

User Contributed Notes

mattcsl at gmail dot com 26-Oct-2013 11:58


thankyou,



this function had a missing comma between test1 and test2 and is fixed below



function get_cache_id($name) {

    // maintain list of caches here

    $id=array(  'test1' => 1,

                'test2' => 2

                );



    return $id[$name];

}

makr at makrit dot net 09-Mar-2013 11:05


shmop made simple:

$test=get_cache('test');

save_cache($test, 'test1', 600);



To save/get cache that easily just save this as cache.php or whatever you see fit:



<?php



function save_cache($data, $name, $timeout) {

    // delete cache

    $id=shmop_open(get_cache_id($name), "a", 0, 0);

    shmop_delete($id);

    shmop_close($id);

    

    // get id for name of cache

    $id=shmop_open(get_cache_id($name), "c", 0644, strlen(serialize($data)));

    

    // return int for data size or boolean false for fail

    if ($id) {

        set_timeout($name, $timeout);

        return shmop_write($id, serialize($data), 0);

    }

    else return false;

}



function get_cache($name) {

    if (!check_timeout($name)) {

        $id=shmop_open(get_cache_id($name), "a", 0, 0);



        if ($id) $data=unserialize(shmop_read($id, 0, shmop_size($id)));

        else return false;          // failed to load data



        if ($data) {                // array retrieved

            shmop_close();

            return $data;

        }

        else return false;          // failed to load data

    }

    else return false;              // data was expired

}



function get_cache_id($name) {

    // maintain list of caches here

    $id=array(  'test1' => 1

                'test2' => 2

                );



    return $id[$name];

}



function set_timeout($name, $int) {

    $timeout=new DateTime(date('Y-m-d H:i:s'));

    date_add($timeout, date_interval_create_from_date_string("$int seconds"));

    $timeout=date_format($timeout, 'YmdHis');



    $id=shmop_open(100, "a", 0, 0);

    if ($id) $tl=unserialize(shmop_read($id, 0, shmop_size($id)));

    else $tl=array();

    shmop_delete($id);

    shmop_close($id);



    $tl[$name]=$timeout;

    $id=shmop_open(100, "c", 0644, strlen(serialize($tl)));

    shmop_write($id, serialize($tl), 0);

}



function check_timeout($name) {

    $now=new DateTime(date('Y-m-d H:i:s'));

    $now=date_format($now, 'YmdHis');



    $id=shmop_open(100, "a", 0, 0);

    if ($id) $tl=unserialize(shmop_read($id, 0, shmop_size($id)));

    else return true;

    shmop_close($id);



    $timeout=$tl[$name];

    return (intval($now)>intval($timeout));

}



?>