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

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??
Session PHP

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Why is no one back??
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Print_r ($_session);
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All users need session database or even a session management system.
Google, have the results of previous efforts
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Advanced usage of the session, write the session to the Memcache or database, you can achieve
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Class Session {
private static $handler =null;
private static $ip =null;
private static $lifetime =null;
private static $time =null;
Initialize variables;
private static function init ($handler) {
Self:: $handler = $handler;
$_server["REMOTE_ADDR"] Gets the 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 ');
Self:: $time =time ();
}

static function Start (PDO $pdo) {
Self::init ($PDO);
_class_ represents this category;
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) < self:: $time) {
Self::d Estroy ($PHPSESSID);
Return ';
}

return $result [' data '];

}

public static function Write ($PHPSESSID, $data) {
$sql = "Select Phpsessid, Update_time, CLIENT_IP, data from session where phpsessid=?";

$stmt =self:: $handler->prepare ($sql);

$stmt->execute (Array ($PHPSESSID));

if ($result = $stmt->fetch (PDO::FETCH_ASSOC)) {
if ($result [' data ']! = $data
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Self:: $time > ($result [' Update_time ']+30)} {
$sql = "Update session set Update_time =?, data =?" where PHPSESSID =? ";

$stm =self:: $handler->prepare ($sql);
$stm->execute (self:: $time, $data, $PHPSESSID));

}
}else{
if (!empty ($data)) {
$sql = "INSERT into session (PHPSESSID, Update_time, CLIENT_IP, data) VALUES (?,?,?,?)";
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