php 讀取 alexa信息

function Alexa($domain)
{
$alexa = '';
$content = get_content('http://www.alexa.com/data/details/traffic_details?url='.$domain);
if(preg_match("/3 mos. Change([sS]*?)/", $content, $matches))
{
$change = strpos($matches[1], 'down_arrow.gif') ? '下降' : '上升';
$p = strip_tags($matches[1], '');
$p = trim(str_replace(array(" ", "n", ""), array('', '', ''), $p));
$p = explode("", $p);
if(isset($p[1])) $alexa.= ' 今日:'.$p[1];
if(isset($p[2])) $alexa.= ' 本周:'.$p[2];
if(isset($p[3])) $alexa.= ' 本月:'.$p[3];
if(isset($p[4])) $alexa.= ' '.$change.':'.$p[4];
}
if(preg_match("/Review for $domain: (.*)
/", $content, $matches))
{
$alexa = $alexa.' 等級:'.$matches[1];
}
$alexa = ''.$alexa.'';
return $alexa;
}