I think it should be something like this:
<table width="50%" border="0" cellspacing="3" cellpadding="0">
<tr>
<td><?php echo "<img src='/album/img/".$photoFileName[2]."'/ >"; ?></td>
<td><?php echo "<img src='/album/img/".$photoFileName[3]."'/ >"; ?></td>
</tr>
<tr>
<td> </td>
<td><?php echo "<img src='/album/img/".$photoFileName[0]."'/ >"; ?></td>
</tr>
</table>
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