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Putting it all together - PHP

There are many reasons to utilize sessions when creating a web-based application using PHP. Session information, by default, is stored in a file on your web server. But what if that becomes a problem? In this article, I'll talk about why you might want to move your PHP sessions to a database, and show you how to do it.

  1. Storing PHP Sessions in a Database
  2. Why did they fail?
  3. Overriding the session storage
  4. Opening and closing the session
  5. Reading and Writing Session Data
  6. Cleaning up the session
  7. Putting it all together
  8. Finishing it up
By: Rich Smith
Rating: starstarstarstarstar / 54
May 02, 2007

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On the last few pages, we've talked about a bunch of little pieces that make up the sessions class.  I thought I would take a minute and give you the complete class in one shot.

class SessionManager {

   var $life_time;

   function SessionManager() {

      // Read the maxlifetime setting from PHP
      $this->life_time = get_cfg_var("session.gc_maxlifetime");

      // Register this object as the session handler
        array( &$this, "open" ), 
        array( &$this, "close" ),
        array( &$this, "read" ),
        array( &$this, "write"),
        array( &$this, "destroy"),
        array( &$this, "gc" )


   function open( $save_path, $session_name ) {

      global $sess_save_path;

      $sess_save_path = $save_path;

      // Don't need to do anything. Just return TRUE.

      return true;


   function close() {

      return true;


   function read( $id ) {

      // Set empty result
      $data = '';

      // Fetch session data from the selected database

      $time = time();

      $newid = mysql_real_escape_string($id);
      $sql = "SELECT `session_data` FROM `sessions` WHERE
`session_id` = '$newid' AND `expires` > $time";

      $rs = db_query($sql);                           
      $a = db_num_rows($rs);

      if($a > 0) {
        $row = db_fetch_assoc($rs);
        $data = $row['session_data'];


      return $data;


   function write( $id, $data ) {

      // Build query                
      $time = time() + $this->life_time;

      $newid = mysql_real_escape_string($id);
      $newdata = mysql_real_escape_string($data);

      $sql = "REPLACE `sessions`
(`session_id`,`session_data`,`expires`) VALUES('$newid',
'$newdata', $time)";

      $rs = db_query($sql);

      return TRUE;


   function destroy( $id ) {

      // Build query
      $newid = mysql_real_escape_string($id);
      $sql = "DELETE FROM `sessions` WHERE `session_id` =


      return TRUE;


   function gc() {

      // Garbage Collection


      // Build DELETE query.  Delete all records who have passed
the expiration time
      $sql = 'DELETE FROM `sessions` WHERE `expires` <


      // Always return TRUE
      return true;



>>> More PHP Articles          >>> More By Rich Smith

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