/* 字典升序*/
function formatParaMap($paraMap)
{
$buff = "";
ksort($paraMap);
foreach ($paraMap as $k => $v)
{
$buff .= $k . "=" . $v . "&";
}
$reqPar = ''; //去掉最后一个字符 $
if (strlen($buff) > 0)
{
$reqPar = substr($buff, 0, strlen($buff)-1);
}
return $reqPar;
}