PHP Includes and Echoes in Head Sections and Search Engines

I'm having a blast with PHP includes and echo functions; I never dreamed they could be so simple and effective. But I have a couple questions relating to head sections and search engines. Consider the following html code: <!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" xml:lang="en" lang="en"> <head> <?php include ("../../../../includes/state/head.php"); ?> <meta name="mssmarttagspreventparsing" content="true" /> <?php include ("../../../../includes/javascript.php"); ?> <?php include ("../../../../includes/stylesheets.php"); ?> <?php $statename = 'Alaska'; $postcode = 'ak'; $linkcode = 'world/na/us/ak'; ?> </head> <body> Welcome to <?php echo "$statename" ?>! * * * * * * * * * * And here's the html code from the include named head.php: <?php $todayDate = date("m-d-Y"); ?> <title>Freedomware &gt; <?php echo "$statename" ?></title> <meta name="description" content="<?php echo "$statename" ?> versus Microsoft" /> <meta name="keywords" content="Alaska, Microsoft, Microshaft, Linux, Bill Gates, corporate corruption" /> * * * * * * * * * * I discovered that includes will apparently work just about anywhere, but echo functions apparently don't work with the <title> tag and meta tags; at least, I can't see the word "Alaska" in those locations when I click View Source in my browser. So I wondered if there IS a way to make echo functions work in meta tags. Also, do you know if text derived from includes causes any problems with search engines? My guess is no, because I can see the included words just fine when I click View Source. Along similar lines, I wondered if there might be potential pitfalls if you import links to style sheets and javascripts as includes. Everything seems to work just fine so far. Thanks.