Adriaan

You form is method GET and in your PHP you use this:

$record = $_POST['record']; // if coming from e.g. a form

How are you gonna get the POST[‘record’] if your form has the method GET?

I guess you should or change your form to:

method="POST" 

or change your $record in php to:

$record = $_GET['record'];

Try this version:

You form:

    <form action="search_result.php" method="POST">
    <input type="text" name="reg" id="reg" />
    <input type="submit" name="Submit" id="Submit" value="Search" />
</form>

search_result.php :

<?php

$host       ="localhost";
$username   ="XXXXXXXXXXX";
$password   ="XXXXXXXXXXX";
$db_name    ="XXXXXXXXXXXX";
$tbl_name   ="reg_add";

/* Connect to MySQL database */
mysql_connect("$host", "$username", "$password") or die("Error connecting to database");
mysql_select_db("$db_name")or die("Error selecting database");

$error = '';

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


    if (!empty($_POST['reg'])) {

        $record = $_POST['reg']; // if coming from e.g. a form

        $query = mysql_query("SELECT * FROM reg_add WHERE reg='" . mysql_real_escape_string($record) . "'");
        $result = mysql_num_rows($query);

        if ($result != 0) {

            $row = mysql_fetch_array($query);

            $first_name = $row['first_name'];
            $last_name = $row['last_name'];
            $reg = $row['reg'];

        } else {

            $error = 'No result have been found!';

        }

    } else {

        $error = 'You have not entered the search field, <a href="javascript:history.back(1)">Go back</a>.';

    }
}

if (!empty($error)) { echo $error; } 
?>


<input  name="reg" value="<? echo $record; ?>">

<input  name="first_name" value="<? echo $first_name; ?>">

<input  name="last_name" value="<? echo $last_name; ?>">