<?php
$link = get_permalink($postid);
$siteadi = get_bloginfo('url');
$slug = str_replace($siteadi, "", $link);
echo get_bloginfo('url')."/en/".$slug;
?>

<?php
$link = get_permalink($postid);
$yeni = str_replace(get_bloginfo('url')."/", get_bloginfo('url')."/en/", $link);
echo $yeni;
?>