Php sessions cannot be stored in the database.

{Code ...} I don't know what's going on. I wrote it in reference books, but I just couldn't store it in the database. I copied the above Code on another page and printed the $ _ SESSION array, but it is empty. I don't know where the problem is? {Code ...}

   0){    ini_set('session.auto_start',0);}function zen_session_open(){    global $zen_session_db;    $zen_session_db = new mysqli('localhost','root','wh36524','phptest');    return TRUE;}function zen_session_close(){    global $zen_session_db;    return $zen_session_db -> close();}function zen_session_read($sid){    global $zen_session_db;    $sql = 'select session_value from sessions where session_id="'.$sid.'"';    $query = $zen_session_db->query($sql);    if($zen_session_db -> errno)    {        die($zen_session_db->error);    }    if($query -> num_rows == 1)    {        $data = $query->fetch_assoc();        return $data['session_value'];    }    else    {        return "";    }}function zen_session_write($sid,$data){    global $zen_session_db;    $sql = 'select count(*) from sessions where session_id="'.$sid.'"';    $query = $zen_session_db->query($sql);    if($zen_session_db->errno)    {        die($zen_session_db->error);    }    if($query->num_rows > 0)    {        $sql = 'update session set session_value="'.$data.'",expire='.(time()+60*60).' where session_id="'.               $sid.'"';        $zen_session_db->query($sql);    }    else    {        $sql = 'insert into session values("'.$sid.'","'.(time()+60*60).'","'.$data.'")';        $zen_session_db->query($sql);    }    /*    if($zen_session_db->affected_rows > 0)    {        return TRUE;    }    else    {        return FALSE;    }    */    return TRUE;}function zen_session_destroy($sid){    global $zen_session_db;    $sql = 'delete from session where session_id="'.$sid.'"';    $zen_session_db->query($sql);    $_SESSION = array();    return TRUE;}function zen_session_gc($time){    global $zen_session_db;    $sql = 'delete from session where expire < '.time();    $zen_session_db->query($sql);    return TRUE;}session_set_save_handler('zen_session_open','zen_session_close','zen_session_read','zen_session_write',    'zen_session_destroy','zen_session_gc'    );session_name('zenID');session_start();$_SESSION['age'] = 16;$_SESSION['color'] = 'green';session_write_close();

I don't know what's going on. I wrote it in reference books, but I just couldn't store it in the database. I copied the above Code on another page and printed the $ _ SESSION array, but it is empty. I don't know where the problem is?

   0){    ini_set('session.auto_start',1);}function zen_session_open(){    global $zen_session_db;    $zen_session_db = new mysqli('localhost','root','wh36524','phptest');    return TRUE;}function zen_session_close(){    global $zen_session_db;    return $zen_session_db -> close();}function zen_session_read($sid){    global $zen_session_db;    $sql = 'select session_value from sessions where session_id="'.$sid.'"';    $query = $zen_session_db->query($sql);    if($zen_session_db -> errno)    {        die($zen_session_db->error);    }    if($query -> num_rows == 1)    {        $data = $query->fetch_assoc();        return $data['session_value'];    }    else    {        return "";    }}function zen_session_write($sid,$data){    global $zen_session_db;    $sql = 'select count(*) from sessions where session_id="'.$sid.'"';    $query = $zen_session_db->query($sql);    if($zen_session_db->errno)    {        die($zen_session_db->error);    }    if($query->num_rows > 0)    {        $sql = 'update session set session_value="'.$data.'",expire='.(time()+60*60).' where session_id="'.               $sid.'"';        $zen_session_db->query($sql);    }    else    {        $sql = 'insert into session values("'.$sid.'","'.(time()+60*60).'","'.$data.'")';        $zen_session_db->query($sql);    }    /*    if($zen_session_db->affected_rows > 0)    {        return TRUE;    }    else    {        return FALSE;    }    */    return TRUE;}function zen_session_destroy($sid){    global $zen_session_db;    $sql = 'delete from session where session_id="'.$sid.'"';    $zen_session_db->query($sql);    $_SESSION = array();    return TRUE;}function zen_session_gc($time){    global $zen_session_db;    $sql = 'delete from session where expire < '.time();    $zen_session_db->query($sql);    return TRUE;}session_set_save_handler('zen_session_open','zen_session_close','zen_session_read','zen_session_write',    'zen_session_destroy','zen_session_gc'    );session_name('zenID');session_start();//$_SESSION['age'] = 16;//$_SESSION['color'] = 'green';print_r($_SESSION);session_write_close();

Reply content:

   0){    ini_set('session.auto_start',0);}function zen_session_open(){    global $zen_session_db;    $zen_session_db = new mysqli('localhost','root','wh36524','phptest');    return TRUE;}function zen_session_close(){    global $zen_session_db;    return $zen_session_db -> close();}function zen_session_read($sid){    global $zen_session_db;    $sql = 'select session_value from sessions where session_id="'.$sid.'"';    $query = $zen_session_db->query($sql);    if($zen_session_db -> errno)    {        die($zen_session_db->error);    }    if($query -> num_rows == 1)    {        $data = $query->fetch_assoc();        return $data['session_value'];    }    else    {        return "";    }}function zen_session_write($sid,$data){    global $zen_session_db;    $sql = 'select count(*) from sessions where session_id="'.$sid.'"';    $query = $zen_session_db->query($sql);    if($zen_session_db->errno)    {        die($zen_session_db->error);    }    if($query->num_rows > 0)    {        $sql = 'update session set session_value="'.$data.'",expire='.(time()+60*60).' where session_id="'.               $sid.'"';        $zen_session_db->query($sql);    }    else    {        $sql = 'insert into session values("'.$sid.'","'.(time()+60*60).'","'.$data.'")';        $zen_session_db->query($sql);    }    /*    if($zen_session_db->affected_rows > 0)    {        return TRUE;    }    else    {        return FALSE;    }    */    return TRUE;}function zen_session_destroy($sid){    global $zen_session_db;    $sql = 'delete from session where session_id="'.$sid.'"';    $zen_session_db->query($sql);    $_SESSION = array();    return TRUE;}function zen_session_gc($time){    global $zen_session_db;    $sql = 'delete from session where expire < '.time();    $zen_session_db->query($sql);    return TRUE;}session_set_save_handler('zen_session_open','zen_session_close','zen_session_read','zen_session_write',    'zen_session_destroy','zen_session_gc'    );session_name('zenID');session_start();$_SESSION['age'] = 16;$_SESSION['color'] = 'green';session_write_close();

I don't know what's going on. I wrote it in reference books, but I just couldn't store it in the database. I copied the above Code on another page and printed the $ _ SESSION array, but it is empty. I don't know where the problem is?

   0){    ini_set('session.auto_start',1);}function zen_session_open(){    global $zen_session_db;    $zen_session_db = new mysqli('localhost','root','wh36524','phptest');    return TRUE;}function zen_session_close(){    global $zen_session_db;    return $zen_session_db -> close();}function zen_session_read($sid){    global $zen_session_db;    $sql = 'select session_value from sessions where session_id="'.$sid.'"';    $query = $zen_session_db->query($sql);    if($zen_session_db -> errno)    {        die($zen_session_db->error);    }    if($query -> num_rows == 1)    {        $data = $query->fetch_assoc();        return $data['session_value'];    }    else    {        return "";    }}function zen_session_write($sid,$data){    global $zen_session_db;    $sql = 'select count(*) from sessions where session_id="'.$sid.'"';    $query = $zen_session_db->query($sql);    if($zen_session_db->errno)    {        die($zen_session_db->error);    }    if($query->num_rows > 0)    {        $sql = 'update session set session_value="'.$data.'",expire='.(time()+60*60).' where session_id="'.               $sid.'"';        $zen_session_db->query($sql);    }    else    {        $sql = 'insert into session values("'.$sid.'","'.(time()+60*60).'","'.$data.'")';        $zen_session_db->query($sql);    }    /*    if($zen_session_db->affected_rows > 0)    {        return TRUE;    }    else    {        return FALSE;    }    */    return TRUE;}function zen_session_destroy($sid){    global $zen_session_db;    $sql = 'delete from session where session_id="'.$sid.'"';    $zen_session_db->query($sql);    $_SESSION = array();    return TRUE;}function zen_session_gc($time){    global $zen_session_db;    $sql = 'delete from session where expire < '.time();    $zen_session_db->query($sql);    return TRUE;}session_set_save_handler('zen_session_open','zen_session_close','zen_session_read','zen_session_write',    'zen_session_destroy','zen_session_gc'    );session_name('zenID');session_start();//$_SESSION['age'] = 16;//$_SESSION['color'] = 'green';print_r($_SESSION);session_write_close();

Ask as many clues as possible, such as yourSQLWhat is the statement, so that it is more convenient for others to test, and I still need to create it myself:

sqlCREATE TABLE `session` (  `session_id` char(128) DEFAULT NULL,  `expire` int(11) DEFAULT NULL,  `session_value` text) ENGINE=MyISAM DEFAULT CHARSET=utf8

The environment information is provided as much as possible. For example, my code can run inPhp 5.5.16-pl0-gentoo

Question 1: Your table name is incorrect. It is used for reading,Sessions; Used for writingSession

Question 2: It seems that the database link opened in the open method cannot be used in other places (I am not sure about this reason, but I can understand why later). I went to the official site and checked it out, all are completed using the class. So I changed your form to OOP to test availability.

   0){    ini_set('session.auto_start',0);}class MySqlSessionHandler implements SessionHandlerInterface{private $_db;public function close(){    return $this->_db->close();}public function destroy($sessionn_id){    $sql = 'delete from sessions where session_id="'.$session_id.'"';    $this->_db->query($sql);    $_SESSION = array();    return TRUE;}public function gc($maxlifetime){    $sql = 'delete from sessions where expire < '.time();    $zen_session_db->query($sql);    return TRUE;}public function open($save_path, $name){    $this->_db = new mysqli('localhost','root','password','test');    return (boolean)$this->_db;}public function read($session_id){    $sql = 'select session_value from sessions where session_id="'.$session_id.'"';    $query = $this->_db->query($sql);    if($this->_db->errno) {        die($this->_db->error);    }    if($query -> num_rows == 1) {        $session_data = $query->fetch_assoc();        return $session_data['session_value'];    } else {        return "";    }}public function write($session_id, $session_data){    $sql = 'select count(*) as count from sessions where session_id="'.$session_id.'"';    $query = $this->_db->query($sql);    $result = $query->fetch_assoc();    if($this->_db->errno) {        die($this->_db->error);    }    if($result['count'] > 0)    {        $sql = 'update sessions set session_value=\''.$session_data.'\',expire='.(time()+60*60).' where session_id="'.            $session_id.'"';        $this->_db->query($sql);    } else {        $sql = 'insert into sessions values("'.$session_id.'","'.(time()+60*60).'",\''.$session_data.'\')';        $this->_db->query($sql);    }    if($this->_db->affected_rows > 0) {        return TRUE;    } else {        return FALSE;    }    }}$handler = new MySqlSessionHandler;session_set_save_handler($handler, true);session_name('zenID');session_start();$_SESSION['age'] = 17;$_SESSION['color'] = 'green';$_SESSION['color2'] = 'red';