[Why is script executing twice]

Hi,
I am an average programmer, i am having problems with a script which i took from [url=http://www.zend.com/zend/spotlight/code-gallery-wade8.php?article=code-gallery-wade8&kind=sl&id=2787&open=1&anc=0&view=1]Custom Session Handling[/url] I made some modification for my needs, but i am facing some problems, The script is executing twice and after 6 seconds its not removing the old sessions (which it should).
What is wrong ? i am not getting, I am stuck and frustrated. any help would be greatly appreciated.Thanks in advance.

DS

[code]
filname=testsession.php
<?php

/* Create new object of class */
ini_set("session.use_only_cookies",false);
require_once("session_api.php");
$ses_class = new session(0.1);

if (!isset ($_SESSION['counter'])) {
    $_SESSION['counter'] = 0;
}

$_SESSION['counter'] = $_SESSION['counter']+1;

echo $_SESSION['counter'];
echo "<br>";
echo $ses_class->ses_maxTime;
echo "<br>";
echo ini_get ("session.gc_maxlifetime");
echo "<br>";
echo ini_get("session.use_only_cookies");

//*********TESTING********
    $fwhandle = @fopen("test.txt","a");
if($fwhandle)
{
if (fwrite($fwhandle, "script called\n") === FALSE)
echo "Cannot write to file";

fclose($fwhandle);
}
else
echo "Cannot open to write file";
    //*********CLOSE TESTING********
?>

filename=session_api.php
<?php

//http://www.zend.com/zend/spotlight/code-gallery-wade8.php?article=code-gallery-wade8&kind=sl&id=2787&open=1&anc=0&view=1
//http://us2.php.net/manual/en/function.session-set-save-handler.php#60316

//session_set_save_handler(
// array("Session", "_open"),
// array("Session", "_close"),
// array("Session", "_read"),
// array("Session", "_write"),
// array("Session", "_destroy"),
// array("Session", "_gc")
// ) or die("Failed to register session handler");
//
//session_start();

class Session
{
    var $db_host = "www.somehost.com";
    var $db_user = "username";
    var $db_pass = "password";
    var $db_dbase = "mysessions";
    /* MySQL Table name for session */
    var $ses_table = "sessions";

var $isdb_con = true;
    var $app_name = "dummy_name";

    var $ses_maxTime=6;
    var $ses_onlyCookie;

/* Class Constructor with max Time out of session in minutes */
function Session($minutes=0)
{
$in_secs = $minutes * 60;
if($in_secs<=0)
$this->ses_maxTime = ini_get("session.gc_maxlifetime");
else
{
ini_set("session.gc_maxlifetime",$in_secs);
$this->ses_maxTime = $minutes * 60;
}

$this->ses_onlyCookie = ini_get("session.use_only_cookies");

//register_shutdown_function('session_write_close');
ini_set("session.gc_probability", 100);
session_set_save_handler(array(&$this, '_open'),
                            array(&$this, '_close'),
                            array(&$this, '_read'),
                            array(&$this, '_write'),
                            array(&$this, '_destroy'),
                            array(&$this, '_gc'));

//Start the session
  session_start();

}

    /* Create a connection to a database */
    function db_connect()
    {
        $mysql_connect = @mysql_pconnect ($this->db_host, $this->db_user, $this->db_pass);
        $mysql_db = @mysql_select_db ($this->db_dbase);

        if (!$mysql_connect || !$mysql_db)
        {
            return FALSE;
        }
        else
        {
            return TRUE;
        }
    }

    /* Open session, if you have your own db connection
      code, put it in here! */
    function _open($path, $name)
    {
    //*********TESTING********
    $fwhandle = @fopen("test.txt","a");
if($fwhandle)
{
if (fwrite($fwhandle, "_open method called\n") === FALSE)
echo "Cannot write to file";

fclose($fwhandle);
}
else
echo "Cannot open to write file";
    //*********CLOSE TESTING********

        if ($this->isdb_con == "Y")
        {
            $this->db_connect();
        }

        return TRUE;
    }

    /* Close session */
    function _close()
    {
    //*********TESTING********
    $fwhandle1 = @fopen("test.txt","a");
if($fwhandle1)
{
if (fwrite($fwhandle1, "_close method called\n") === FALSE)
echo "Cannot write to file";

fclose($fwhandle1);
}
else
echo "Cannot open to write file";
    //*********CLOSE TESTING********

        /* This is used for a manual call of the
          session gc function */
        $this->_gc(0);

        return TRUE;
    }

    /* Read session data from database */
    function _read($ses_id)
    {
    //*********TESTING********
    $fwhandle2 = @fopen("test.txt","a");
if($fwhandle2)
{
if (fwrite($fwhandle2, "_read method called\n") === FALSE)
echo "Cannot write to file";

fclose($fwhandle2);
}
else
echo "Cannot open to write file";
    //*********CLOSE TESTING********

        $session_sql = "SELECT * FROM " . $this->ses_table
                    . " WHERE ses_id = '$ses_id'";

// echo "<br/>$session_sql<br/>";

        $session_res = @mysql_query($session_sql);
        if (!$session_res)
        {
            return '';
        }

        $session_num = @mysql_num_rows ($session_res);
        if ($session_num > 0)
        {
            $session_row = mysql_fetch_assoc ($session_res);

            if(isset($_SERVER['REMOTE_ADDR']))
$ipnum = "$_SERVER[REMOTE_ADDR]";
else
$ipnum = "";

if($session_row["ip_number"] !=$ipnum)
{
//don't show anything
return '';
}

            $ses_data = $session_row["ses_value"];

            return $ses_data;
        }
        else
        {
            return '';
        }
    }

    /* Write new data to database */
    function _write($ses_id, $data)
    {
    //*********TESTING********
    $fwhandle3 = @fopen("test.txt","a");
if($fwhandle3)
{
if (fwrite($fwhandle3, "_write method called\n") === FALSE)
echo "Cannot write to file";

fclose($fwhandle3);
}
else
echo "Cannot open to write file";
    //*********CLOSE TESTING********

        $session_sql = "UPDATE " . $this->ses_table
                    . " SET ses_time=" . time()
                    . ", ses_value='$data' WHERE ses_id='$ses_id'";
echo "<br/>$session_sql<br/>";
        $session_res = @mysql_query ($session_sql);

        if (!$session_res)
        {
            return FALSE;
        }
        if (mysql_affected_rows ())
        {
            return TRUE;
        }

if(isset($_SERVER['REMOTE_ADDR']))
$ipnum = "'$_SERVER[REMOTE_ADDR]'";
else
$ipnum = Null;

        $session_sql = "INSERT INTO " . $this->ses_table
                    . " (ses_id, ses_time, ses_start, ses_value,app_name,ip_number)"
                    . " VALUES ('$ses_id', " . time()
                    . ", " . time() . ", '$data','$this->app_name',$ipnum)";

// echo "<br/>$session_sql<br/>";

        $session_res = @mysql_query ($session_sql);
        if (!$session_res)
        {
            return FALSE;
        }
        else
        {
            return TRUE;
        }
    }

    /* Destroy session record in database */
    function _destroy($ses_id)
    {
    //*********TESTING********
    $fwhandle4 = @fopen("test.txt","a");
if($fwhandle4)
{
if (fwrite($fwhandle4, "‘_destroy’ method called\n") === FALSE)
echo "Cannot write to file";

fclose($fwhandle4);
}
else
echo "Cannot open to write file";
    //*********CLOSE TESTING********

        $session_sql = "DELETE FROM " . $this->ses_table
                    . " WHERE ses_id = '$ses_id'";
        $session_res = @mysql_query ($session_sql);

        if (!$session_res)
        {
            return FALSE;
        }
        else
        {
            return TRUE;
        }
    }

    /* Garbage collection, deletes old sessions */
    function _gc($life) //ignore $life
    {
    //*********TESTING********
    $fwhandle5 = @fopen("test.txt","a");
if($fwhandle5)
{
if (fwrite($fwhandle5, "‘_gc’ method called\n") === FALSE)
echo "Cannot write to file";

fclose($fwhandle5);
}
else
echo "Cannot open to write file";
    //*********CLOSE TESTING********

    $strtim ="-". $this->ses_maxTime ." seconds";

        $ses_life = strtotime($strtim);
        $session_sql = "DELETE FROM " . $this->ses_table . " WHERE ses_time < $ses_life and app_name='$this->app_name'";
        echo "<br/>$session_sql<br/>";
        $session_res = @mysql_query ($session_sql);

        if (!$session_res)
            return FALSE;

//also see all sessions for max of 24 hours (default)
$strtim1 ="-". get_cfg_var("session.gc_maxlifetime") ." seconds";

$ses_life1 = strtotime($strtim1);
$session_sql1 = "DELETE FROM " . $this->ses_table . " WHERE ses_time < $ses_life1";
        $session_res1 = @mysql_query ($session_sql1);

        if (!$session_res1)
            return FALSE;
        else
            return TRUE;
    }
}
?>

[/code]