获取alexa排名

<?php
/**
 * Get Alexa Rank
 *
 * @param Domain Name $Domain
 * @return Alexa Rank 
 * @copyright SanyWork http://www.sanywork.cn/
 */

$Domain='tuniu.com';

echo getAlexaRank($Domain);
function getAlexaRank($Domain) {
	$line = "";
	$data = "";
	$URL = "http://data.alexa.com/data/?cli=10&dat=snba&ver=7.0&url=" . $Domain;
	$fp = fopen ( $URL, "r" );
	if ($fp) {
		while ( ! feof ( $fp ) ) {
			$line = fgets ( $fp );
			$data .= $line;
		}
		$p = xml_parser_create ();
		xml_parse_into_struct ( $p, $data, $vals );
		xml_parser_free ( $p );
		for($i = 0; $i < count ( $vals ); $i ++) {
			if ($vals [$i] ["tag"] == "POPULARITY") {
				return $vals [$i] ["attributes"] ["TEXT"];
			}
		}
	}
}
?>