How to Get Title, Description, and Keywords of a Website in PHP ?

<form action="show.php" method="POST">

    <table cellspacing="0" height="38%" width="57%" style="border:1px solid;">

            <tr><td width="27%">Enter URL:</td><td width="50%"><input class="input" type="text" id="url" name="url"></td></tr>                     

                        <tr> <td></td><td><input type="submit" name="submit" value="submit" /></td></tr>

      </table>

  </form>

if(isset($_REQUEST['submit'])){
 //$weburl variable to store url
 $weburl=$_REQUEST['url']; 
    $html = file_get_contents_curl("$weburl");
    //parsing begins here:
    $doc = new DOMDocument();
    @$doc->loadHTML($html);
   $nodes = $doc->getElementsByTagName('title');
   //get and display data:
   $title = $nodes->item(0)->nodeValue;
   $metas = $doc->getElementsByTagName('meta');
   for ($i = 0; $i < $metas->length; $i++)
   {
    $meta = $metas->item($i);
    if($meta->getAttribute('name') == 'description')
        $description = $meta->getAttribute('content');
    if($meta->getAttribute('name') == 'keywords')
        $keywords = $meta->getAttribute('content');
    }
     echo "Title: $title". '<br/><br/>';
     echo "Description: $description". '<br/><br/>';
     echo "Keywords: $keywords".'<br/><br/>';
     $regex='|<a.*?href="(.*?)"|';
        preg_match_all($regex,$html,$parts);
        $links=$parts[1];
       foreach($links as $link){
         echo "Internal and External Links".": ". $link."<br>";
       }
    echo '<br/>';
    echo "ip address of your webstie:",gethostbyname($weburl). '<br/><br/>'; 
    $start=0;
    $time = microtime();
    $time = explode(' ', $time);
    $time = $time[1] + $time[0];
    $finish = $time;
    $total_time = round(($finish - $start), 4);
   echo'Load time:Page generated in ' . $total_time . ' seconds.';
   echo '<br/><br/>';
  
   $ch = curl_init($weburl);
   curl_setopt($ch, CURLOPT_HEADER, true);    // we want headers
   curl_setopt($ch, CURLOPT_NOBODY, true);    // we don't need body
   curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
   curl_setopt($ch, CURLOPT_TIMEOUT,10);
   $output = curl_exec($ch);
   $httpcode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
  curl_close($ch);

  echo 'HTTP code: ' . $httpcode;
  }
?>