How does PHP get all the SessionID? Or get all the session

Just want to read all the SessionID through a. php file? Or get all the session??

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Why is no one back??

Print_r ($_session);

Print_r ($_session);

I mean. Read all users, not single one.
For example, a user landed in a area to produce a SessionID B user landed in area B to produce a SessionID
Also get

All users need session database or even a session management system.
Google, have the results of previous efforts

Advanced usage of the session, write the session to the Memcache or database, you can achieve

Class Session {private static $handler =null;private static $ip =null;private static $lifetime =null;private static $time = null;//initialization variable, private static function init ($handler) {self:: $handler = $handler;//$_server["REMOTE_ADDR"] Get client routing Address ; Self:: $ip =!empty ($_server["REMOTE_ADDR"])? $_server["REMOTE_ADDR"]: ' Unknown ';//ini_get () Gets the configuration file variable; Self:: $lifetime =ini_get (' session.gc_maxlifetime '); $time =time ();} static function Start (PDO $pdo) {self::init ($PDO);//_class_ represents this class; Session_set_save_handler (Array (__class__, "open"), Array (__class__, "close"), Array (__class__, "read"), Array (__class__, "write"), Array (__class__, "destroy"), Array (__ CLASS__, "GC")); Session_Start ();} public static function open ($path, $name) {return true;} public static function Close () {return true;} public static function read ($PHPSESSID) {$sql = ' select Phpsessid, Update_time, CLIENT_IP, data from session where PHPSESSID = ?"; $stmt =self:: $handler->prepare ($sql), $stmt->execute (Array ($PHPSESSID)), if (! $result = $stmt->fetch (PDO:: Fetch_assOC) {return ';} if (self:: $ip! = $result ["Client_ip"]) {self::d Estroy ($PHPSESSID); return ';} if ($result ["update_time"] + self:: $lifetime) prepare ($sql); $stmt->execute (Array ($PHPSESSID)); if ($result =$ Stmt->fetch (PDO::FETCH_ASSOC)) {if ($result [' data ']! = $data | | Self:: $time > ($result [' Update_time ']+30)} {$sql = "Update session Set Update_time =?, data =?" where PHPSESSID =? "; $stm =self:: $handler->prepare ($sql), $stm->execute (Array (self:: $time, $data, $PHPSESSID));}} Else{if (!empty ($data)) {$sql = "INSERT into session (PHPSESSID, Update_time, CLIENT_IP, data) VALUES (?,?,?,?)"; $sth =self:: $handler->prepare ($sql), $sth->execute (Array ($PHPSESSID, self:: $time, Self:: $ip, $data));}} return true;} public static function Destroy ($PHPSESSID) {$sql = ' Delete from session where PHPSESSID =? '; $stmt =self:: $handler->prepare ($sql), $stmt->execute (Array ($PHPSESSID)), return true; private static function GC ($lifetime) {$sql = "Delete from session where Update_time prepare ($sql); $stmt->executE (Array (self:: $time-$lifetime)); return true;}} try{$pdo =new PDO ("mysql:host=localhost;dbname=xsphpdb", "root", "123456");} catch (Pdoexception $e) {echo $e->getmessage ();} Session::start ($PDO);

With this class

By default, if the file system is the driver, you can get the session file storage location by Session_save_path (). Then read each file sequentially and deserialize it.
Each user's session ID corresponds to a file, which begins with Sess_ and is stored in the location of the Session_save_path () lock setting.

This is not a good type.

Change the Session.save_handler to DB and then read the DB. But files are OK, so you should read the Session.save_path.

Echo session_id ()

All SessionID can only be read by the session's storage directory, or all sessions will be saved in the database.

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