<?php
$site = trim("http://www.nedir.com/kal%C4%B1n-ba%C4%9F%C4%B1rsak");
$doc = new DOMDocument();
$doc->loadHTML(file_get_contents($site));
$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');
    
}
print_r($keywords);


### in curl ###

// $curl = curl_init();
// curl_setopt($curl,CURLOPT_URL, $site);
// curl_setopt($curl,@CURLOPT_RETURNTRANSFER, true);
// curl_setopt($curl,@CURLOPT_FOLLOWLOCATION, true);

// $exec = curl_exec($curl);


// preg_match('@<meta.*?name="keywords".*?content="(.*?)" />@si',$exec,$keywords);
// preg_match('@<meta.*?name="description".*?content="(.*?)".*?/>@si',$exec,$description);



// $keywords = $keywords[1];
// $description = $description[1];
// print_r($keywords);