SMS platform PHP code

$flag = 0;
//Data to be posted
$argv = array(
'sn'=>'SDK-BBX-010-XXXXX',
'pwd'=>'XXXXXX',
'mobile'=>'15201692834',
'content'=>'How are you, test text message'
);
//Construct the string to be posted
foreach ($argv as $key=>$value) {
if ($flag!=0) {
$params .= "&";
$flag = 1;
}
$params.= $key."="; $params.= urlencode($value);
$flag = 1;
}
$length = strlen($params);
//Create socket connection
$fp = fsockopen("sdk2.entinfo.cn",80,$errno,$errstr,10) or exit($errstr."--->".$errno);
//Construct the header of the post request
$header = "POST /z_send.aspx HTTP/1.1rn";
$header .= "Host:sdk2.entinfo.cnrn";
$header .= "Referer:/mobile/sendpost.phprn";
$header .= "Content-Type: application/x-www-form-urlencodedrn";
$header .= "Content-Length: ".$length."rn";
$header .= "Connection: Closernrn";
//Add post string
$header .= $params."rn";
//Send post data
fputs($fp,$header);
$inheader = 1;
while (!feof($fp)) {
$line = fgets($fp,1024); //Remove the header of the request packet and only display the return data of the page
if ($inheader && ($line == "n" || $line == "rn")) {
$inheader = 0;
}
if ($inheader == 0) {
// echo $line;
}
}
if($line==1)
{
echo 'SMS sent successfully, please check the return value'.$line;
}else
{
echo 'Failed to send SMS, please check related error issues according to the return value. Return value'.$line;
}
fclose($fp);

$flag = 0;
 //Data to be posted
$argv = array(
 'sn'=>'SDK-BBX-010-XXXXX',
 'pwd'=> ;'XXXXXX',
 'mobile'=>'15201692834',
 'content'=>'How are you, test text message'
 );
//Construct the string to be posted
foreach ($argv as $ key=>$value) {
 if ($flag!=0) {
 $params .= "&";
 $flag = 1;
 }
 $params.= $key."="; $params. = urlencode($value);
 $flag = 1;
 }
 $length = strlen($params);
 //Create a socket connection
 $fp = fsockopen("sdk2.entinfo.cn",80,$errno, $errstr,10) or exit($errstr."--->".$errno);
 //Construct the header of the post request
 $header = "POST /z_send.aspx HTTP/1.1rn";
 $header .= "Host:sdk2.entinfo.cnrn";
 $header .= "Referer:/mobile/sendpost.phprn";
 $header .= "Content-Type: application/x-www-form-urlencodedrn";
 $header .= "Content-Length: ".$length."rn";
 $header .= "Connection: Closernrn";
 //Add the post string
 $header .= $params."rn";
 //Send post data
 fputs($fp,$header);
 $inheader = 1;
 while (!feof($fp)) {
 $line = fgets($fp,1024); //Remove request packet The header only displays the return data of the page
 if ($inheader && ($line == "n" || $line == "rn")) {
 $inheader = 0;
 }
 if ($inheader == 0 ) {
 // echo $line;
 }
 }
 if($line==1)
 {
 echo 'SMS sent successfully, please check the return value'.$line ;
 }else
 {
 echo 'SMS sent failed , please check the related error issues based on the return value. $line