my curl function is not working for rest api call using xml.my code is this below

my curl function is not working for rest api call using xml.my code is this below

    $mydata = $xml->addChild('MobileNo',$row['MobileNo']);
    $mydata = $xml->addChild('Name',$row['Name']);
    $mydata = $xml->addChild('Age',$row['Age']);
    $mydata = $xml->addChild('Gender',$row['Gender']);
    $mydata = $xml->addChild('HeightCm',$row['HeightCm']);
    $mydata = $xml->addChild('WeightKg',$row['WeightKg']);
                            $mydata = $xml->addChild('MarritalStatus',$row['MarritalStatus']);
    $mydata = $xml->addChild('DrikingStatus',$row['DrikingStatus']);
                            $mydata = $xml->addChild('ConsumesAlcohol',$row['ConsumesAlcohol']);
                            $mydata = $xml->addChild('Remarks',$row['Remarks']);
                            $mydata = $xml->addChild('Symptoms');
                            $mydata1 = $mydata->addChild('Symptom');


                            while($DataSMT= mysql_fetch_assoc($SelctSMT))
                            {
                            $mydata1->addChild('Name',$DataSMT['Symptons']);
                            $mydata1->addChild('Duration',$DataSMT['Duration']);
                            $mydata1->addChild('Location',$DataSMT['Location']);
                            $mydata1 = $mydata1->addChild('SubSymptoms');

                                            $DataArr = explode(",",$DataSMT['question']);
                                            $AnsArr = explode(",",$DataSMT['answer']);
                                            foreach($DataArr as $k=>$v)
                                            {
                                            $mydata2 = $mydata1->addChild('SubSymptom');
                                            $mydata2->addChild('SubSymptomQuery',$v);
                                            $mydata2->addChild('Response',$AnsArr[$k]);
                                            }

                            }
                            $mydata = $xml->addChild('MedicalHistory');
                            $mydata3 = $mydata->addChild('CronicIllness');
                            $mydata3->addChild('Asthma',$row['asthma']);
                            $mydata3->addChild('Allergy',$row['allergy']);
                            $mydata3->addChild('Cardiac',$row['cardiac_disease']);
                            $mydata3->addChild('HighBP',$row['high_bp']);
                            $mydata->addChild('Improvement',$row['improvement_status_from_prior_medication']);
                            $mydata->addChild('PriorSurgery',$row['prior_surgery']);
                            $mydata->addChild('PriorTreatment',$row['prior_treatment']);

            $fp = fopen($row['id'].".xml","wb");
            $xml = fwrite($fp,$xml->asXML());

i searched about this on almost every site but i am unable to find a pointed answer which can solve my problem.,., can who can help me .,., thanks.