รบกวนถามเรื่อง api ค่ะ เรื่องการส่ง sms พอดีหนูไม่รุว่าทำถูกรึป่าว

// Target URL
	//$sendTo = 'http://202.43.33.246/tunnel/servlet/sendSMS.do';
	
	// Authenticate Header
	$userName = 'xxxxxxxx';
	$passWord = 'xxxxxxxx';
	
	$txnID = date('YmdHis') . rand(3,3);
	
	
	$dest = '0890833236'; //เบอร์
	$sender = 'SMS';
	
	/*$xmlEncoding = 'US-ASCII';
	$msgType = 'E';
	$msData = 'Hello SMS';*/
	$xmlEncoding = 'UTF-8';
	$msgType = 'T';
	$msData = 'ทดสอบระบบ';
	
	
     $authenHeader = base64_encode( $userName. ':' . $passWord );
     


	// Post data     
	$postData = "<?xml version=\"1.0\" encoding=\"$xmlEncoding\"?>
	<transaction>
	<id>$txnID</id>
	<msisdn>$dest</msisdn>
	<msgtype>$msgType</msgtype>
	<msdata>$msData</msdata>
	<sender>$sender</sender>
	</transaction>";
	   
	$fp = fsockopen("202.43.33.246", 80, $errno, $errstr, 30);  
	if (!$fp) {
	    echo "$errstr ($errno)<br />\n";
	} else {
	    $reqPkg = "POST /tunnel/servlet/sendSMS.do HTTP/1.1\r\n";
	    $reqPkg .= "Host: 202.43.33.246\r\n";
	    $reqPkg .= "Content-type: text/xml; charset=UTF-8\r\n";
	    $reqPkg .= "Authorization: $authenHeader\r\n";	    
	    $reqPkg .= "Connection: close\r\n";
	    $reqPkg .= "Content-Length: " . strlen($postData) . "\r\n\r\n";
	    $reqPkg .= "$postData";
	    
	
	    echo "$reqPkg";
	    fwrite($fp, $reqPkg);
	    while (!feof($fp)) {
	        $respData .= fgets($fp, 128);
	        echo "$respData";
	    }
	    fclose($fp);
	}
	
	
	if( ! is_null( $respData )){
		$xml= new DOMDocument();
		$xml->preserveWhiteSpace=false;		
		$xml->loadXML(trim(substr( $respData, stripos($respData, '<transaction>'), strlen($respData) - strlen('<transaction>') )));
		$aResp =xml2array($xml);
		if( is_array($aResp) && $aResp['transaction']['status'] == '0'){
			echo 'Sent success: message ID['.  $aResp['transaction']['msgid'] .']' ;
		}else{
			echo 'Sent fail: ['.  $aResp['transaction']['status'] .'],' . $aResp['transaction']['desc'] ;
		}
	}
	
	function xml2array($n){
		$return=array();
		foreach($n->childNodes as $nc)
		($nc->hasChildNodes())
	    ?($n->firstChild->nodeName== $n->lastChild->nodeName&&$n->childNodes->length>1)
	    ?$return[$nc->nodeName][]=xml2array($item)
	    :$return[$nc->nodeName]=xml2array($nc)
	    :$return=$nc->nodeValue;
	    return $return;
	}