Hello there. I used this code for user and it works but when I use and alter a bit for admin side system, there is no data inside of the text field and the username keep on changing to 0 eventhough I type in other username. This is the code.

password.php

<?php 

session_start();
$admin=$_POST['admin_id'];
$adpass=$_POST['admin_password'];

$conn = mysql_connect("localhost", "root", "")or die("Could not connect to server");
$db = mysql_select_db("Smartlocker", $conn)or die("Could not connect to database");
$sql = "SELECT * FROM admin WHERE admin_id='$admin' ";
$result = mysql_query($sql) or die ("Could not execute query");
$info=mysql_fetch_row($result);

?>

<?php
    do{
    echo "
    <table width='172' border='0'>
        <tr>
            <td width='62' height='32'><i><b>Username</b></i></td>
            <td width='10'><strong>:</strong></td>
            <td width='100'><input name='admin_id' type='text' size='30' value='$info[0]'></td>
        </tr>
        <tr>
            <td width='62' height='30'><i><b>Password</b></i></td>
            <td width='10'><strong>:</strong></td>
            <td width='100'><input name='admin_password' type='password' size='30' value='$info[1]'></td>
        </tr>        
        <tr>
            <td></td>
            <td></td>
            <td><div align ='right'><form name='pass' method='post' action='savepassword.php'>
            <input type='submit' name='submit' value='Edit'>                                 
            </form></div></td>
        </tr>
    </table> ";
    }while($info=mysql_fetch_row($result));
?>

and this is the process.
savepassword.php

<?php

session_start();

$conn = mysql_connect("localhost", "root", "")or die("Could not connect to server");
$db = mysql_select_db("Smartlocker", $conn)or die("Could not connect to database");
$sql = "UPDATE admin SET admin_id='$admin_id', admin_password='$admin_password'
        WHERE admin_id='$admin' ";
$result = mysql_query($sql) or die ("Could not execute query");

if($result)
{
    echo "  

<table width='1291' height='401' border='1' bordercolor='C0F7FE' bgcolor='E9F1EA'>
    <tr>
        <td>Password successfully updated</td>
    </tr>
</table> ";
}

?>

Did I miss out some codes or there is something wrong with it?

<form name='pass' method='post' action='savepassword.php'>
    <table width='172' border='0'>
    <tr>
    <td width='62' height='32'><i><b>Username</b></i></td>
    <td width='10'><strong>:</strong></td>
    <td width='100'><input name='admin_id' type='text' size='30' value='$info[0]'></td>
    </tr>
    <tr>
    <td width='62' height='30'><i><b>Password</b></i></td>
    <td width='10'><strong>:</strong></td>
    <td width='100'><input name='admin_password' type='password' size='30' value='$info[1]'></td>
    </tr>
    <tr>
    <td></td>
    <td></td>
    <td><div align ='right'>
    <input type='submit' name='submit' value='Edit'>
  </div></td>
    </tr>
    </table></form>";

can you give your table structure? and as what arti18 posted..there is a form as you save the username and password cause from your code there is no form..

from the savepassword.php file
this line
$sql = "UPDATE admin SET admin_id='$admin_id', admin_password='$admin_password' WHERE admin_id='$admin' "; $admin_id should contain post or get variable like $admin_id = $_POST['admin_id']; and $admin as well

table structure? you mean like this?

<table width='172' border='0'>
    <tr>
        <td width='62' height='32'><i><b>Username</b></i></td>
        <td width='10'><strong>:</strong></td>
        <td width='100'>
        <input name='admin_id' type='text' size='30' value='$info[0]'></td>
    </tr>
    <tr>
        <td width='62' height='30'><i><b>Password</b></i></td>
        <td width='10'><strong>:</strong></td>
        <td width='100'>
        <input name='admin_password' type='password' size='30' value='$info[1]'></td>
    </tr>
    <tr>
        <td></td>
        <td></td>
        <td><div align ='right'>
        <form name='pass' method='post' action='savepassword.php'>
        <input type='submit' name='submit' value='Edit'>
        </form></div></td>
    </tr>
</table>

do you mean like, it need to have 3 steps from form -> password.php -> savepassword.php?
is it something like this?

is it a must to put

$admin=$_POST['admin_id'];
$adpass=$_POST['admin_password'];

after

session_start();

give link to update password and in that link pass admin id throught query string and then update password on savepassword page.

  <?php 
    session_start();
$conn = mysql_connect("localhost", "root", "carina")or die("Could not connect to server");
    $db = mysql_select_db("test", $conn)or die("Could not connect to database");


     if(isset($_POST['submit']))
    {

    $admin=$_POST['admin_id'];
    $adpass=$_POST['admin_password'];



      $sql = "SELECT * FROM admin WHERE admin_id='$admin' ";
    $result = mysql_query($sql) or die ("Could not execute query");
    $info=mysql_fetch_array($result);
     $admin_id=$info['admin_id'];
     $_SESSION['admin_id']=$admin_id;
     //echo $admin_id;
     header('location:savepassword.php');
}
   ?>
  <body>

    <form name='pass' method='post'>
    <table width='172' border='0'>
    <tr>
    <td width='62' height='32'><i><b>Username</b></i></td>
    <td width='10'><strong>:</strong></td>
    <td width='100'><input name='admin_id' type='text' size='30' value=''></td>
    </tr>
    <tr>
    <td width='62' height='30'><i><b>Password</b></i></td>
    <td width='10'><strong>:</strong></td>
    <td width='100'><input name='admin_password' type='password' size='30' value=''></td>
    </tr>
    <tr>
    <td></td>
    <td></td>
    <td><div align ='right'>
    <input type='submit' name='submit' value='Login'>
  </div></td>
    </tr>
    </table></form> 

   </body>



savepassword.php

    <?php
    session_start();
    $conn = mysql_connect("localhost", "root", "carina")or die("Could not connect to server");
    $db = mysql_select_db("test", $conn)or die("Could not connect to database");
    $admin='';
    $adpass='';
    if(isset($_SESSION['admin_id']))
    {
    $admin=$_SESSION['admin_id'];
    //$adpass=$_POST['admin_password'];


    $sql = "SELECT * FROM admin WHERE admin_id='$admin' ";
    $result = mysql_query($sql) or die ("Could not execute query");
    $info=mysql_fetch_array($result);
     $admin_id=$info['admin_id'];
     echo $admin_id;
}
     if(isset($_POST['submit']))
     {
        $admin=$_POST['admin_id'];
    $adpass=$_POST['admin_password'];

    $sql = "UPDATE admin SET admin_id='$admin', admin_password='$adpass'
    WHERE admin_id='$admin_id'";
    //echo $sql;
    $result = mysql_query($sql) or die ("Could not execute query");
    if($result)
    {
    echo "
    <table width='1291' height='401' border='1' bordercolor='C0F7FE' bgcolor='E9F1EA'>
    <tr>
    <td>Password successfully updated</td>
    </tr>
    </table> ";
}
}
    ?>

    <html>
    <head>
        <title></title>
    </head>
    <body>
        <form method='post'>
       Admin Id:<input name='admin_id' type='text' size='30' value=''>
       <br>
    Password:<input name='admin_password' type='password' size='30' value=''>
    <input type='submit' name='submit' value='Edit'>
    </form>
    </body>
    </html>

test this i run your code it has so many errors all solved and change database coonection to your database connection,i think that's the thing you want

okay. but wait. starting from the first line until 47th, it didn't show any data on the text field or is that one for login?

yes it is for login you have to give login permition to user after that user can change password without login how can user change the password for her/himself

heres the process
1. <form method="post" action="savepassword.php"></form>
2. redirect from savepassword.php
3. get all $_POST value (as youve seen from 1 you used post method)
$_POST - is an array that contains the input element from the form(see #1)

$_POST['<name of the element>']

for example <input type="text" name="student_id"> so you could get the value of the posted student id by $_POST['student_id']
4. then you can use them to the preceeding code.

I did like you ask me to but it shows this message.
Parse error: parse error, expecting T_STRING' orT_VARIABLE' or `T_NUM_STRING'