Log In Student With Unique Id

[hanspeare]

Good day Admins,

I have now variables

$learner_id
$student_paswor d

The learner_id and student_passwor d are being used as their log in accounts. While the student_id is being used as their unique id and it is auto-incremented.

Here are my codes.

Student_login_h andler.php

<?php
session_start();
include 'Connect.php';
$flag = "";
$learner_id = $_POST['learner_id'];
$student_password =  $_POST['student_password'];
$query = "select last_login_date from student_information where learner_id='$learner_id' and student_password='$student_password'";
$result = mysql_query($query,$link_id);
if(mysql_error() != null){
die(mysql_error());
}
if($date = mysql_fetch_array($result))
{
$lastdate = $date['last_login_date'];
$date2 = date("d-m-Y h:i A",strtotime($lastdate));
$_SESSION["user_id"] = $_POST["student_id"];
$_SESSION["lastlogin"] =$date2;
$_SESSION["type"] = "Student";
mysql_query("UPDATE student_information SET last_login_date=now() where student_id='$GET[id]'",$link_id);
if(mysql_error() != null){
die(mysql_error());
}
header("location:  Student_Home.php?id={$student_id}"); 
die();
}
else
{
$flag = "invalid";
header("location:Student_login.php?flag=$flag");
die();
} 
?>

Here is my Student_login.p hp

<td width="35%" align="left" class="style7 style1">Learner Id : </td>
           <td width="65%" align="left"><input name="learner_id" type="text" id="learner_id" action="Student_Home.php" method="post"></td>
        </tr>
        <tr bgcolor="#E1E1E1" class="stylesmall">
           <td align="left" class="style7 style1">Password:</td>
           <td align="left"><input name="student_password" type="password" id="student_password"></td>
        </tr>
        <tr bgcolor="#E1E1E1">	
           <td colspan="2" align="center">&nbsp;
		     <?php if(!empty($_GET['flag']) && $_GET['flag'] == "invalid") { ?>
             <span class="stylered style1">Invalid Learner Id or Password</span>
			 <?php }?></td>
        </tr>
        <tr bgcolor="#E1E1E1">
           <td colspan="2" align="center">
		        <p><input name="login" class="style10" type="submit" id="login" value="Login"></p>

This is so far what i've got and it's wrong. Help me to modify this gentlemen to achieve the objectives given above.

It directs me to URL
http://localhost/a/S...nt_Home.php ?id=

which i expect to be

http://localhost/a/S..._Home.php?i d=51 (51 is the auto-incremented student_id, bears unique id of student)

Please help me modify the codes.

[androidapp]

There is no need to redirect to different URL, just set a session for this studentid.

[hanspeare]

Hello android app,

i suppose your not only that android app. Maybe that is what i am missing.

I would be delighted if you help me to make that session and declared that student_id variable.

Please modify my codes. I dont really have an idea where to start with that except for what i have posted.
Please :-(