<?php
$yazi = '<meta name="description" content="en güzel Penelope Makyaj oyunu" />';
preg_match("'<meta name=\"description\" content=\"(.*?)\" />'", $yazi, $description);
echo $description[1];
?>

<?php
$meta = get_meta_tags('http://www.google.com/');
echo $meta['description'];
?>