get ascii-based url from a url which contains unicode

get_linkable_url.php

<?php

/**
* @param $url
* @param bool $validate
* @return string
*/

function get_linkable_url($url, $validate = true)
{
    $url = trim($url);

    if(empty($url)) return null;

    if(substr($url,0,4) != 'http'){
        $url = 'http://'.$url;
    }

    $prs = parse_url($url);

    $url = strtolower($prs['scheme']).'://'. idn_to_ascii(strtolower($prs['host']),IDNA_DEFAULT, INTL_IDNA_VARIANT_UTS46) ;

    if(isset($prs['port'])){
        $url .= ':'.$prs['port'];
    }

    $non_ascii = '/[^\x00-\x7F|\s]/';

    if(isset($prs['path'])){
        $parts = explode('/',$prs['path']);
        array_walk($parts,function(&$part) use ($non_ascii){
            preg_match($non_ascii,$part,$matches);
            if( !empty($matches)){
                $part = urlencode($part);
            }
        });
        $url .= implode('/',$parts);
    }

    if(isset($prs['query'])){
        $queryset = explode('&',$prs['query']);

        foreach($queryset as $qset){
            $kv = explode('=',$qset);
            preg_match($non_ascii,$kv[1],$matches);
            $val = empty($matches)? $kv[1]:urlencode($kv[1]);
            $newQuery[] = sprintf('%s=%s',$kv[0],$val);
        }
        $url .= '?'. implode('&',$newQuery);
    }
    if(isset($prs['fragment'])){
        preg_match($non_ascii,$prs['fragment'],$matches);
        if(empty($matches)){
            $url .= '#'.$prs['fragment'];
        } else {
            $url .= '#'.urlencode($prs['fragment']);
        }
    }

    if($validate){
        $url = filter_var($url,FILTER_VALIDATE_URL);
    }
    return $url;
}