Php alternate several body attribute from a link [solved]

PHP
3

I think that I have found a solution (with this help): with GET:

1st page

<p><a href="aaa.2.php?varname=en">eng</a><br />
<a href="aaa.2.php?varname=it">ita</a><br />
<a href="aaa.2.php?varname=es">esp</a></p>

2nd page

<?php
$lang = $_GET['varname'];
?>
<html>
 <body lang="<?php if(empty($lang)) {echo "it";} else {echo"$lang";} ?>">
<p>some words</p>
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