i have this site that i just did, that uses xml to pull info from my supplier.

i'm using this.

Code:
function send_request_test($data, $path, $host) {    
    $header = "POST ".$path." HTTP/1.0\r\n";
    $header .= "Host: ".$host."\r\n";
    $header .= "Content-Type: text/xml\r\n";
    $header .= "Content-Length: " . strlen($data) . "\r\n\r\n";
    // open socket
    $fp = fsockopen($host, 80, $errno, $errstr, 60);
    $retval='';
    if (!$fp) {
        return "Error: " . $errstr;
    }
    else {
        fputs($fp, $header.$data);
        while (!feof($fp)) {
            $retval .= fread($fp, 1024);
        }
        fclose ($fp);
    }
    return $retval;
}

$test_xml = "
<?xml version ='1.0' encoding='UTF-8'?>
		<root>
			<header>
				<protocol>1</protocol>
				<oem>supplier</oem>
				<agentID>11111</agentID>
				<password>password</password>	
				<sessionID>5bcsx0ut3e0pck45fikpgd55</sessionID>
			</header>
			<body>
				<opCode>OP_SET_INFO</opCode>
				<deferPayment>0</deferPayment>
				<reserveDetails>
					<step>SAVE_RES</step>
				</reserveDetails>
				<pfileNumOnlyInResponse></pfileNumOnlyInResponse>
			</body>
			</root>
";

$test_content = send_request_test($test_xml, $test_path, $test_host);

$pos = strpos($test_content, '<body>');

if ($pos === false) {
    //echo "The string '$findme' was not found in the string '$mystring'";
} else {
	$test_data = substr($test_content, $pos);
	$xml_parser = xml_parser_create();
	xml_set_element_handler($xml_parser, "startTag_reservation", "endTag_reservation");
	xml_set_character_data_handler($xml_parser, "contents_test_reservation");

	if(!(xml_parse($xml_parser, $test_data))){
		die("Error on line " . xml_get_current_line_number($xml_parser));
	}

	xml_parser_free($xml_parser);
}
the above code appears to send and receive the data i requested. However, the sessionID that is supposed to be returned with the data changes with each response. This should not be the case, as i tried sending the exact same xml via a standalone xml program (SendXML) the sessionID remained consistent.

Is there anything that i might have missed or included that somehow resets the xml request? or anything? i was stuck on this for 1 whole week before it suddenly hit me that the sessionid wasn't consistent.

Please help!