md5签名

 //签名
 public function MakeSign($data, $appSecret) {  
 
 if (empty($data)) return '';
 ksort($data);
 $Signature = '';
 foreach ($data as $key => $val) {
 $Signature .= $key . "=" . $val."&";
 }
 $Signature .="key=".$appSecret;
 $Signature =strtoupper(md5($Signature));
 //$Signature = substr($Signature, 0, -1);
 //$Signature = urlencode($Signature);
 //$Signature = hash_hmac("sha1", $Signature, $appSecret);


 return $Signature;  
 }