Error: Call to a member function

[Kayzio]

I recently wrote a session class to store sessions in my database and here it is:

<?php

    /**
    * Project:        Kayzio Framework
    * File:        Session/main.class.php
    *
    * @copyright 2007 Kayzio. All Rights Reserved.
    * @author Matthew Dahl <dahl.matthew@gmail.com>
    * @package Kayzio Framework
    */

    /***********************************************************************************/

    class SessionManager {

        /**
        * Session Life Time
        *
        * @public int
        */
        var $LifeTime;

        /***********************************************************************************/

        /**
        * Close
        */
        function Close() {
            return true;
        }

        /**
        * Destroy
        *
        * @param int
        */
        function Destroy($ID) {
            if(strtolower($DB->dbType) == "mysql") {
                $NewID = mysql_real_escape_string($ID);
            }
            else {
                $NewID = addslashes($ID);
            }
            $SessionData = $DB->Query("DELETE FROM sessions WHERE id = '$NewID'");
            return true;
        }

        /**
        * Garbage Collection
        */
        function GarbageCollection() {
            $SessionData = $DB->Query("DELETE FROM sessions WHERE expires < time()");
            return true;
        }

        /**
        * Session Manager
        */
        function SessionManager() {
            $this->LifeTime = get_cfg_var("session.gc_maxlifetime");
            session_set_save_handler(
                array(&$this, "Open"),
                array(&$this, "Close"),
                array(&$this, "Read"),
                array(&$this, "Write"),
                array(&$this, "Destroy"),
                array(&$this, "GarbageCollection")
            );
        }

        /**
        * Open
        *
        * @params string, string
        */
        function Open($SavePath, $SessionName) {
            global $sess_save_path;
            $sess_save_path = $SavePath;
            return true;
        }

        /**
        * Read
        *
        * @param int
        */
        function Read($ID) {
            $Data = "";
            $Time = time();
            if(strtolower($DB->dbType) == "mysql") {
                $NewID = mysql_real_escape_string($ID);
            }
            else {
                $NewID = addslashes($ID);
            }
            $SessionData = $DB->Query("SELECT data FROM sessions WHERE id = '$NewID' AND expires > $Time");
            $NumRows = $DB->NumRows($SessionData);
            if ($NumRows > 0) {
                $Row = $DB->FetchAssoc($SessionData);
                $Data = $Row['data'];
            }
            return $Data;
        }

        /**
        * Write
        *
        * @params int, string
        */
        function Write($ID, $Data) {
            $Time = time() + $this->LifeTime;
            if(strtolower($DB->dbType) == "mysql") {
                $NewID = mysql_real_escape_string($ID);
                $NewData = mysql_real_escape_string($Data);
            }
            else {
                $NewID = addslashes($ID);
                $NewData = addslashes($Data);
            }
            $ReplaceSession = $DB->Query("UPDATE sessions SET id = '$NewID' AND data = '$NewData' AND expires = '$Time'");
            return true;
        }

    }

    /***********************************************************************************/

?>

The thing is when I go to use it I get the following error:

Fatal error: Call to a member function Query() on a non-object in ... on line 96

Here is line 96:

            $SessionData = $DB->Query("SELECT data FROM sessions WHERE id = '$NewID' AND expires > $Time"); 

Any ideas to what is actually causing this error and how to fix it. Thanks in advance,
Matt

[spikeZ]

where have you defined $DB...?

[Apfelbutzen]

I guess you will need to place a "global $DB;" at the top of your class

[byron3@earthlink]

How about did you instantiate the object?
$db = new Database();

Where does this db class come from?

[Kayzio]

In my main file I define DB and I do $sess = new SessionManager(); start_session();. I know the DB class works because I use it all throughout my site. I have used Query, FetchArray, etc. and they all work which is why I am confused. So basically my main file includes all of the classes so I would think DB should work within the session class. How do you define a global in a class b/c if I put global $DB; in my class I get the following error

Parse error: parse error, unexpected T_GLOBAL, expecting T_FUNCTION

.

[Kayzio]

This is really weird, I took the session functions out of a class so that way DB would already be a global and I still get the same error for some reason about call to a member function. And in case your wondering I removed the arrays in the save handler so that they call the proper functions.

<?php

    /**
    * Project:        Kayzio Framework
    * File:        Session/main.php
    *
    * @copyright 2007 Kayzio. All Rights Reserved.
    * @author Matthew Dahl <dahl.matthew@gmail.com>
    * @package Kayzio Framework
    */

    /***********************************************************************************/

    /**
    * Session Life Time
    */
    $SessionLifeTime = null;

    /***********************************************************************************/

    /**
    * Close
    */
    function SessionClose() {
        return true;
    }

    /**
    * Destroy
    *
    * @param int
    */
    function SessionDestroy($ID) {
        if(strtolower($DB->dbType) == "mysql") {
            $NewID = mysql_real_escape_string($ID);
        }
        else {
            $NewID = addslashes($ID);
        }
        $SessionData = $DB->Query("DELETE FROM sessions WHERE id = '$NewID'");
        return true;
    }

    /**
    * Garbage Collection
    */
    function SessionGarbageCollection() {
        $SessionData = $DB->Query("DELETE FROM sessions WHERE expires < time()");
        return true;
    }

    /**
    * Session Manager
    */
    function SessionManager() {
        $SessionLifeTime = get_cfg_var("session.gc_maxlifetime");
        session_set_save_handler(
            "SessionOpen",
            "SessionClose",
            "SessionRead",
            "SessionWrite",
            "SessionDestroy",
            "SessionGarbageCollection"
        );
    }

    /**
    * Open
    *
    * @params string, string
    */
    function SessionOpen($SavePath, $SessionName) {
        global $sess_save_path;
        $sess_save_path = $SavePath;
        return true;
    }

    /**
    * Read
    *
    * @param int
    */
    function SessionRead($ID) {
        $Data = "";
        $Time = time();
        if(strtolower($DB->dbType) == "mysql") {
            $NewID = mysql_real_escape_string($ID);
        }
        else {
            $NewID = addslashes($ID);
        }
        $SessionData = $DB->Query("SELECT data FROM sessions WHERE id = '$NewID' AND expires > $Time");
        $NumRows = $DB->NumRows($SessionData);
        if ($NumRows > 0) {
            $Row = $DB->FetchAssoc($SessionData);
            $Data = $Row['data'];
        }
        return $Data;
    }

    /**
    * Write
    *
    * @params int, string
    */
    function SessionWrite($ID, $Data) {
        $Time = time() + $this->LifeTime;
        if(strtolower($DB->dbType) == "mysql") {
            $NewID = mysql_real_escape_string($ID);
            $NewData = mysql_real_escape_string($Data);
        }
        else {
            $NewID = addslashes($ID);
            $NewData = addslashes($Data);
        }
        $ReplaceSession = $DB->Query("UPDATE sessions SET id = '$NewID' AND data = '$NewData' AND expires = '$Time'");
        return true;
    }

    /***********************************************************************************/

?>