post xml数据

function postXmlCurl($xml, $url, $useCert = false, $second = 30){        
    $ch = curl_init();
    //设置超时
    curl_setopt($ch, CURLOPT_TIMEOUT, $second);
    
    
    curl_setopt($ch,CURLOPT_URL, $url);
    if(stripos($url,"https://")!==FALSE){
        curl_setopt($ch, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
    }else{
        curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,TRUE);
        curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,2);//严格校验
    }
    //设置header
    curl_setopt($ch, CURLOPT_HEADER, FALSE);
    //要求结果为字符串且输出到屏幕上
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);

    if($useCert == true){
        //设置证书
        //使用证书：cert 与 key 分别属于两个.pem文件
        curl_setopt($ch,CURLOPT_SSLCERTTYPE,'PEM');
        curl_setopt($ch,CURLOPT_SSLCERT, "../cert/###.pem");
        curl_setopt($ch,CURLOPT_SSLKEYTYPE,'PEM');
        curl_setopt($ch,CURLOPT_SSLKEY, "../cert/###.pem");
        
        curl_setopt($ch, CURLOPT_CAINFO, '../cert/rootca.pem'); 
    }
    //post提交方式
    curl_setopt($ch, CURLOPT_POST, TRUE);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
    //运行curl
    $data = curl_exec($ch);
    //返回结果
    if($data){
        curl_close($ch);
        return $data;
    } else { 
        $error = curl_errno($ch);
        curl_close($ch);
        echo "error";
    }
}