第PHP使用Redis實現(xiàn)Session共享的實現(xiàn)示例小型web服務,session數(shù)據基本是保存在本地(更多是本地磁盤文件),但是當部署多臺服務,且需要共享session,確保每個服務都能共享到同一份session數(shù)據.

redis數(shù)據存儲在內存中,性能好,配合持久化可確保數(shù)據完整.

設計方案

1.通過php自身session配置實現(xiàn)

#使用redis作為存儲方案

session.save_handler=redis

session.save_path="tcp://:6379"

#若設置了連接密碼,則使用如下

session.save_path="tcp://:6379auth=密碼"

測試代碼

ini_set("session.save_handler","redis");

ini_set("session.save_path","tcp://:6379");

session_start();

echo"pre

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

var_dump($_SESSION);

echo"/pre

輸出↓

array(2){

["usertest1"]=

int(88)

["usertest3"]=

int(1)

}

usertest1|i:1;usertest3|i:1;

評價

優(yōu)點:實現(xiàn)簡單,無需修改php代碼

缺點:配置不支持多樣化,只能應用于簡單場景

2.設置用戶自定義會話存儲函數(shù)

通過session_set_save_handler()函數(shù)設置用戶自定義會話函數(shù).

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

在配置完會話存儲函數(shù)后,再執(zhí)行session_start()即可.

具體代碼略,以下提供一份Memcached的(來自Symfony框架代碼):

*ThisfileispartoftheSymfonypackage.

*(c)FabienPotencierfabien@

*Forthefullcopyrightandlicenseinformation,pleaseviewtheLICENSE

*filethatwasdistributedwiththissourcecode.

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

*MemcacheSessionHandler.

*@authorDrakdrak@

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