PHP Variable not Echoing - php

Question

Evening All, just trying to figure out why some of my variables are not echoing from my MYSQL database. At first they were going to be Session variables of which i found did not work, so then i changed to a mysql query on my invoice page
$OrderID = $_SESSION[OrderID];
$LName = mysql_result(mysql_query("SELECT LName FROM customers WHERE Username = '$Username'"), 0);
$Fname = mysql_result(mysql_query("SELECT FName FROM customers WHERE Username = '$Username'"), 0);
$Date = mysql_result(mysql_query("SELECT Date FROM orders WHERE OrderID = '$OrderID'"), 0);
My Queries above. Order ID and Date are working, yet Lname and Fname are not where everything is named correctly as they are in the database.
Full Code below of where i am trying to echo them.
<div id='containter' style='position:absolute;width:750px;height:800px; left:50% ; margin-left: -375px; border-style: solid;border-width: 1px;'>
<div id='heading' style='position:absolute;width:650px;height:100px; left:50% ; margin-left: -325px;top:20px; border-style: solid;border-width: 1px;'>
<div style='position:absolute;left:500px;text-align:center;font-size:36px;'> <p>INVOICE </p></div>
<div style='position:absolute;text-align:center;font-size:38px;width:250px;left:-20px;'> OzScopes</div>
<div style='position:absolute;text-align:center;font-size:16px;width:250px;left:-37px;top:45px;'> ozscopes.com.au</div>
<div id='headingbottom' style='position:absolute;width:100%;height:20px;top:80px;'>
<table>
<tr>
<td style='position:absolute;left:5%;'>Invoice Number </td>
<td style='position:absolute;left:25%;'> <?php echo $OrderID;?> </td>
<td style='position:absolute;left:77%;'><?php echo $Date ;?></td>
</tr>
</table>
</div>
</div>
<div id='invoicecontent' style='position:absolute;width:650px;height:600px; left:50% ; margin-left: -325px;top:140px; border-style: solid;border-width: 1px;'>
<div id='information'>
<div id='customerinfo' style='position:absolute;width:255px;height:75px;top:-210px;padding:10px; border-bottom: 2px solid;border-right:1px solid; display:inline'>
<table>
<tr>
<th>Customer Information</th>
</tr>
<tr>
<td> <?php echo $LName;?> lnametest</td>
</tr>
</table>
</div>
<div id='mailinginfo' style='position:absolute;width:355px;height:75px;left:275px;top:-210px;padding:10px;border-bottom: 2px solid; display:inline'>
Mailing Information
</div>
</div>
<div id='products' style='position:absolute;top:97px;width:650px;height:503px;'>
<?php
echo "<table border=\"0\" cellspacing=\"0\" padding=\"0\" width=\"650px\">";
echo "<tr style='font-weight: bold; font-size:16px;'>";
echo "<td colspan=\"2\" align=\"center\" style='border-bottom: 2px solid;font-family:'Ek Mukta';color:#464d48;'>Description</td>";
echo "<td align=\"left\" style='border-bottom: 2px solid;font-family:'Ek Mukta';color:#464d48;'>Quantity</td>";
echo "<td colspan=\"3\" align=\"center\" style='border-bottom: 2px solid ;font-family:'Ek Mukta';color:#464d48;'>Price (Per Unit)</td>";
echo "<td align=\"center\" style='border-bottom: 2px solid;font-family:'Ek Mukta';color:#464d48;'>Total</td>";
echo "</tr>";
echo "</table>";
?>
</div>
<div id='payment'>
</div>
</div>
</div>

Answer 1

Where are you getting $Username? should you get it from the session first?
Like so:
$Username = $_SESSION[Username];
otherwise this string is empty and the select statement will come back as empty, because the where clause was based on username = $Username (which in this case is empty).
Get username of the session variable first, then use it in where clause. Apart from that, as others have said, please avoid using mysql queries, use mysqli instead.
Hope it helps.