PHP使用Redis实现Session共享的实现示例

2023-08-23 15:16:06 70

前言

小型web服务,session数据基本是保存在本地(更多是本地磁盘文件),但是当部署多台服务,且需要共享session,确保每个服务都能共享到同一份session数据.

redis数据存储在内存中,性能好,配合持久化可确保数据完整.

设计方案

1.通过php自身session配置实现

#使用redis作为存储方案
session.save_handler=redis
session.save_path="tcp://127.0.0.1:6379"
#若设置了连接密码,则使用如下
session.save_path="tcp://127.0.0.1:6379?auth=密码"

测试代码

";
$_SESSION['usertest'.rand(1,5)]=1;
var_dump($_SESSION);

echo"

输出↓

array(2){
["usertest1"]=>
int(88)
["usertest3"]=>
int(1)
}
usertest1|i:1;usertest3|i:1;

评价

优点:实现简单,无需修改php代码
缺点:配置不支持多样化,只能应用于简单场景

2.设置用户自定义会话存储函数

通过session_set_save_handler()函数设置用户自定义会话函数.

session_set_save_handler(callable$open,callable$close,callable$read,callable$write,callable$destroy,callable$gc[,callable$create_sid[,callable$validate_sid[,callable$update_timestamp]]]):bool

#>=php5.4
session_set_save_handler(object$sessionhandler[,bool$register_shutdown=TRUE]):bool

在配置完会话存储函数后,再执行session_start()即可.

具体代码略,以下提供一份Memcached的(来自Symfony框架代码):


*
*Forthefullcopyrightandlicenseinformation,pleaseviewtheLICENSE
*filethatwasdistributedwiththissourcecode.
*/

namespaceSymfony\Component\HttpFoundation\Session\Storage\Handler;

/**
*MemcacheSessionHandler.
*
*@authorDrak
*/
classMemcacheSessionHandlerimplements\SessionHandlerInterface
{
/**
*@var\MemcacheMemcachedriver.
*/
private$memcache;

/**
*@varintTimetoliveinseconds
*/
private$ttl;

/**
*@varstringKeyprefixforsharedenvironments.
*/
private$prefix;

/**
*Constructor.
*
*Listofavailableoptions:
**prefix:Theprefixtouseforthememcachekeysinordertoavoidcollision
**expiretime:Thetimetoliveinseconds
*
*@param\Memcache$memcacheA\Memcacheinstance
*@paramarray$optionsAnassociativearrayofMemcacheoptions
*
*@throws\InvalidArgumentExceptionWhenunsupportedoptionsarepassed
*/
publicfunction__construct(\Memcache$memcache,array$options=array())
{
if($diff=array_diff(array_keys($options),array('prefix','expiretime'))){
thrownew\InvalidArgumentException(sprintf(
'Thefollowingoptionsarenotsupported"%s"',implode(',',$diff)
));
}

$this->memcache=$memcache;
$this->ttl=isset($options['expiretime'])?(int)$options['expiretime']:86400;
$this->prefix=isset($options['prefix'])?$options['prefix']:'sf2s';
}

/**
*{@inheritdoc}
*/
publicfunctionopen($savePath,$sessionName)
{
returntrue;
}

/**
*{@inheritdoc}
*/
publicfunctionclose()
{
return$this->memcache->close();
}

/**
*{@inheritdoc}
*/
publicfunctionread($sessionId)
{
return$this->memcache->get($this->prefix.$sessionId)?:'';
}

/**
*{@inheritdoc}
*/
publicfunctionwrite($sessionId,$data)
{
return$this->memcache->set($this->prefix.$sessionId,$data,0,time()+$this->ttl);
}

/**
*{@inheritdoc}
*/
publicfunctiondestroy($sessionId)
{
return$this->memcache->delete($this->prefix.$sessionId);
}

/**
*{@inheritdoc}
*/
publicfunctiongc($maxlifetime)
{
//notrequiredherebecausememcachewillautoexpiretherecordsanyhow.
returntrue;
}

/**
*ReturnaMemcacheinstance
*
*@return\Memcache
*/
protectedfunctiongetMemcache()
{
return$this->memcache;
}
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持毛票票。

PHP使用Redis实现Session共享的实现示例

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