淘宝客短网址还原长链接

<?php
//淘宝客短网址还原链接
//unescape 转码
function unescape($str) { 
    $ret = ‘‘; 
    $len = strlen($str); 
    for ($i = 0; $i < $len; $i ++) 
    { 
        if ($str[$i] == ‘%‘ && $str[$i + 1] == ‘u‘) 
        { 
            $val = hexdec(substr($str, $i + 2, 4)); 
            if ($val < 0x7f) 
                $ret .= chr($val); 
            else  
                if ($val < 0x800) 
                    $ret .= chr(0xc0 | ($val >> 6)) . 
                     chr(0x80 | ($val & 0x3f)); 
                else 
                    $ret .= chr(0xe0 | ($val >> 12)) . 
                     chr(0x80 | (($val >> 6) & 0x3f)) . 
                     chr(0x80 | ($val & 0x3f)); 
            $i += 5; 
        } else  
            if ($str[$i] == ‘%‘) 
            { 
                $ret .= urldecode(substr($str, $i, 3)); 
                $i += 2; 
            } else 
                $ret .= $str[$i]; 
    } 
       return $ret; 
    }


//使用curl模拟请求返回得到真实url
function geturl($clickurl){        
                $headers = get_headers($clickurl, TRUE);
                $tu = $headers[‘Location‘];
                $eturl = unescape($tu[1]);   //获取完整连接
                $u = parse_url($eturl);        //得到et的连接
                $param = $u[‘query‘];                
                $ref = str_replace(‘tu=‘, ‘‘, $param);
                $ch = curl_init();  
                curl_setopt($ch, CURLOPT_URL, $ref);                  
                curl_setopt($ch, CURLOPT_REFERER, $tu[1]);   
                curl_setopt($ch, CURLOPT_HEADER, false);  
                curl_setopt($ch, CURLOPT_NOBODY,1);
                curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
                curl_setopt($ch, CURLOPT_FOLLOWLOCATION,true);
                curl_setopt($ch, CURLOPT_MAXREDIRS,2);                
                $out = curl_exec($ch);  
                $dd =  curl_getinfo($ch);
                curl_close($ch);  
                $item_url = $dd[‘url‘];
                return $item_url; 
}
$res = geturl("http://s.click.taobao.com/xxx"); //这里输入淘宝客短连接
print_r($res);
?>