Hey All,
I have a Register.php page, whose code is as follows. On Register Me button, i want to restore values back in text boxes, when some invalid input is in textboxes. How can i do this?

<?php session_start(void); ?>

<html>

<head>

<title>Login System Using PHP</title>

<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">

</head>

<body bgcolor="#6CADD0">

<div align="center">

<table width="800px" border="0">

<tr>

<td>

<div align="right"><font color="#FFFFFF" size="4" face="Verdana, Arial, Helvetica, sans-serif"><strong><hr color="#FFFFFF" align="right" width="30%">Login System Using Php<hr color="#FFFFFF" align="right" width="30%"></strong></font></div>
<br>

<font color="#000000" size="2" face="Verdana, Arial, Helvetica, sans-serif"><strong> <font color="#FFFFFF">Lab Task Definition :</font></strong>

<blockquote>
  To create a full login system, including all type of input validation and use of mysql as database management system. The system should include registration and extras.
</blockquote>

</font>

<table width= "800px">

<tr>

<td width="100%" >

<Br>
<font color="#000000" size="2" face="Verdana, Arial, Helvetica, sans-serif">
<strong>
<div align="center"><hr width="100%" color="#000000" size="1"><font color="#FFFFFF">Register Here</font><hr width="100%" color="#000000" size="1"></div>
</strong>
</font>
<br>

<div align="center">

<table width="600px" border="0">

<form action="register.php" method="post">

<tr>

<td align="right" width="50%" valign="top">

Username:

</td>

<td align="left" width="50%" valign="top">

<input type="text" name="username">

</td>


</tr>

<tr>

<td align="right" width="50%" valign="top">

Registration No:

</td>

<td align="left" width="50%" valign="top">

<input type="text" name="Regno">

</td>


</tr>

<tr>

<td align="right" width="50%" valign="top">

Password:<br>

</td>

<td align="left" width="50%" valign="top">

<input type="password" name="password" value= <?php $_POST[password]?>><br>

</td>


</tr>

<tr>

<td align="right" width="50%" valign="top">

Retype Password:<br>

</td>

<td align="left" width="50%" valign="top">

<input type="password" name="repassword" ><br><br>

<div align="center">
<input type="submit" value="Register Me">
</div>
</td>

<?php

if($_POST[username])
{

$Reg=$_POST[Regno];

$num1="^0[1-9]-[SCEMC]E-[0-9][1-9]$";

 if(eregi($num1, $Reg))
  {
    $Pwd = $_POST[password];
    $num2="^[1-9a-zA-Z]+$"; //password validation


    $pwd1 = $_POST[repassword];
    
    //echo $pwd1;
    //echo $Pwd;
    
    if (eregi($pwd1, $Pwd))
    {

      if(eregi($num2, $Pwd))

        {

                     $conn = mysql_connect("localhost", "root", "");
                     mysql_select_db(logindb,$conn);
                     $sql = "SELECT * FROM student where registrationNo='$_POST[Regno]'";
                     
                     $result = mysql_query($sql, $conn);
                     
                     $row = mysql_fetch_array($result);
                     
                     $reg=$row['RegistrationNo'];
                     
                     if($reg!=$_POST[Regno])
                         {

                              $sql = "INSERT INTO users (username,registrationNo,password) values('$_POST[username]','$_POST[Regno]','$_POST[password]')";
                              
                              mysql_query($sql, $conn);
                              
                              header("location:index.php");

                         }
                     else
                         {
                              echo"<font color='#D0D0D0' size='2' face='Verdana'> <strong>You are already Registered..</strong></font> ";
                         }
         }
         else
         {
             echo"<font color='#D0D0D0' size='2' face='Verdana'> <strong>Please enter valid password.</strong></font> ";

         }
      }
      else
      {
           echo"<font color='#D0D0D0' size='2' face='Verdana'><strong>Passwords don't match.</strong></font>";

      }
      
    }
    else
          echo"<font color='#D0D0D0' size='2' face='Verdana'><strong> Please enter valid reg No.</strong></font>";
 }
 else
 {
       echo"<font color='#000000' size='2' face='Verdana'><strong> Please enter your name </strong></font>";

 }
 
 



?>


</tr>
</form>

</table>

</div>

</td>

</tr>

</table>

</td>

</tr>

<tr> 

<td valign="baseline">

<div align="center"><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><strong>Developed By: Syed Ammar Hassan</strong><br><?php print ("Date, "); echo date("d:m:y", time());?></font></div>

</td>

</tr>

</table>

</div>

</body>

</html>

I believe he wants to redisplay the values that the user entered if the form fails validation and needs to be edited and resubmitted.

When you validate each feild set each one as a session. Something like this:

$_SESSION['name'] = $_POST['name'];

Therefore when the page validates you could do the following to each input.

<input type='text' name='name' value="
<?php 
if (isset ($_POST['name'] && !empty ($_POST['name'])) {
echo $_POST['name'];
}
 ?>
">

The code above wont work however it gives you an outline of how what you want can be done.
If you need help coding the system please say.

Hope this helps

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