Simple PHP script

<?
    echo "<html>\n";
    echo "<head>\n";
    echo "<title>Sample web page produced by PHP</title>\n";
    echo "</head>\n";
    echo "<body>\n";
    $server = "http://geo-nsdi.er.usgs.gov";
    $site = "thesaurus/catalog";
    echo "<A HREF=\"$server/$site/\">Catalog</A>\n";
    echo "</body>\n";
    echo "</html>\n";
?>

Can mix HTML and PHP code:

<html>
<head>
<title>Sample web page produced by PHP</title>
</head>
<body>
<?
    $server = "http://geo-nsdi.er.usgs.gov";
    $site = "thesaurus/catalog";
    echo "<A HREF=\"$server/$site/\">Catalog</A>\n";
?>
</body>
</html>

Dynamic web applications
Peter Schweitzer, U.S. Geological Survey