unicode issue

function xs_main($id, $name = true) {
    if (function_exists('icl_object_id')) {
        $id = icl_object_id($id, 'page', true, 'en');
    }

    if ($name === true) {
        $post = get_post($id);
        return xsslug($post->post_name);
    } else {
        return $id;
    }
}
function xsslug($input){
    $string = html_entity_decode($input,ENT_COMPAT,"UTF-8");
    $oldLocale = setlocale(LC_CTYPE, '0');
    setlocale(LC_CTYPE, 'en_US.UTF-8');
    $string = iconv("UTF-8","ASCII//TRANSLIT",$string);
    setlocale(LC_CTYPE, $oldLocale);
    return strtolower(preg_replace('/[^a-zA-Z0-9]+/','',$string));

}




content-intro.php#
line 14: <section id="section-<?php echo xs_main($post->ID, false); ?>">


one-page.php#
line 44: <!--BEGIN-<?php echo xs_main($post->ID); ?> // Post ID: <?php echo xs_main($post->ID, false); ?> -->


walkermenu#
line 87: $atts['href'] = $prefx . 'section-' . xs_main($item->object_id, false);
line 102: $atts['href'] = $prefx . 'section-' . xs_main($item->object_id, false);