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Whitespace can cause problems with html output.
To keep it simple, you should always avoid any whitespace or comments above the initial output.
For example, the comment <!-- Header --> below would throw off the web page. The doctype should be first without any whitespace above it.
<?php }else{ ?>
<!-- Header -->
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>