PHP 获取网页title

<?php
$url = 'http://sohu.com';
$lines_array = file($url);
echo $lines_array;
echo "<br/>";
$lines_string = implode('', $lines_array);
eregi("<title>(.*)</title>", $lines_string, $head);
echo "head:".$head;
echo "<br/>";
print_r($head);
echo "<br/>";
echo "title:".$head[1];

?>