Update script not working and no error shows
<p>I am a newbie updating the database (i have skipped some steps so that i do some things quicker) I have this code but the database does not update and i do not get any error.</p>

<pre><code>&lt;?php
require_once '../includes/configuration.php';

if (isset($_POST['enter']))
{
    $_POST['employee_id_passport'] = $employee_id_passport;
    $_POST['first_name'] = $first_name;
    $_POST['surname'] = $surname;
    $_POST['mobile_number'] = $mobile_number;
    $sql_query_update = "UPDATE employee_master 
                             SET first_name = '$first_name', 
                             surname = '$surname', 
                             mobile_number = '$mobile_number' 
                             WHERE employee_id_passport = '$employee_id_passport'";
            $result = mysql_query($sql_query_update, $connection);
    echo "this";

}
else
    {

            //display form with employee details
            if (isset($_GET['idno']))
            {
                $employee_id_passport = $_GET['idno'];

                $sql_get_employee_details_query = "SELECT * FROM employee_master WHERE employee_id_passport = '$employee_id_passport'";
                $result = mysql_query($sql_get_employee_details_query, $connection);
                $row = mysql_fetch_assoc($result);
                echo $row['employee_id_passport'] . "&lt;br /&gt; " . $row['surname'] . "&lt;br /&gt; " . $row['first_name'] . "&lt;br /&gt; " . $row['mobile_number'] . "&lt;br /&gt; ";



                echo "&lt;!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\"";
                echo "\"http:www.w3.org/TR/xhthml1/DTD/xhtml1-transitional.dtd\"&gt;";

                echo "&lt;html xmls=\"http://www.w3.org/1999/xhtml\" xml:lang=\"en\" lang=\"en\"&gt;";

                echo "&lt;head&gt;";
                echo    "&lt;title&gt; &lt;/title&gt;";

                echo    "&lt;meta http-equiv=\"Content-Type\" content=\"text/html; charset=iso-8859-1\" /&gt;";
                echo "&lt;/head&gt;";

                echo "&lt;body&gt;";
                echo   "&lt;form name=\"view_employee\" method=\"POST\" action=\"" .  $_SERVER['PHP_SELF'] . " \"   /&gt;";
                echo        "Employee ID/Passport: &lt;input type=\"text\" name=\"id_passport\" disabled=\"disabled\" value=\" " .  $row['employee_id_passport'] . "\" /&gt; &lt;br /&gt;";
                echo        "First Name: &lt;input type=\"text\" name=\"first_name\" value=\" ".  $row['first_name'] .  "\" /&gt; &lt;br /&gt;";
                echo        "Surname: &lt;input type=\"text\" name=\"surname\" value=\" " .  $row['surname'] . "\" /&gt; &lt;br /&gt;";
                echo        "Mobile Number: &lt;input type=\"text\" name=\"mobile_number\" value=\" " .   $row['mobile_number'] . "\"/&gt; &lt;br /&gt;";
                echo        "&lt;input type=\"submit\" value=\"enter\" name=\"submit\" /&gt;";
                echo    "&lt;/form&gt;";
                echo "&lt;/body&gt;";

                echo "&lt;html&gt;";
            }
    }

?&gt;
</code></pre>
