Question

做php短信接口，为什么手机收不到信息，ajax返回值为1

$mobile=$_POST['tel'];
$_SESSION['zc_phone']=$_POST['tel'];
$_SESSION['sj_yzm']= rand(100000, 999999);
$content= urlencode("体验RHC无线WIFI网络，您的验证码是".$_SESSION['sj_yzm']."，请畅游无线网络，谢谢！【润汇诚】");
$pwd= md5("gf_chn".md5("runhc"));
$url = "http://wf.runhc.com/sms/sendSMS2.jspx?username=sada&password=".$pwd."&mobile=13145985931&content=".$content;
$ch = file_get_contents($url);
echo $ch;
这样写对吗