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<?php $lang = 'fra';
 
$link = preg_replace(
    '/^(.*)(_[a-z]{1,3})?\.php(\?.*)?$/DUi',
    ''.($lang?'_'.$lang:'').'.php',
    $_SERVER['REQUEST_URI']);
 
 ?>
<div class="smena_jazikov">
<a class="smena_jazikov_link"  href="<?php echo $link; ?>">FRA</a>
</div>