php curl xml传输和转换

<?php

/**
 * API
 * User: sgfoot
 * Date: 2017/3/20
 * Time: 18:05
 */
class apiCurl
{
    private $config = array(
        'key'     => '7D86A79BA5C4C278E5264D5E910B3A64',
    );
    public function execute($url, $params)
    {
        $baseParams = $this->getParams();
        $apiPrams = array_merge($baseParams, $params);
        $apiPrams['sign'] = $this->getSign($apiPrams);
        $xml = $this->arrayToXml($apiPrams);
        $xml_result = Cpost($url, $xml);
        $result = $this->xmlToArray($xml_result);
        return $result;
    }

    /**
     * 获取基础参数
     * @author: wzl
     * @date: 2017
     * @return array
     */
    protected function getParams()
    {
        $params = array(
            'nonce_str' => $this->getNonce(),
            'sign_type' => 'MD5',
        );
        return $params;
    }

    /**
     *    作用：生成签名
     */
    protected function getSign($Obj)
    {
        foreach ($Obj as $k => $v) {
            $Parameters[$k] = $v;
        }
        //签名步骤一：按字典序排序参数
        ksort($Parameters);
        $String = $this->formatBizQueryParaMap($Parameters, false);
        //echo '【string1】'.$String.'</br>';
        //签名步骤二：在string后加入KEY
        $String = $String . "&key=" . $this->config['key'];
        //echo "【string2】".$String."</br>";
        //签名步骤三：MD5加密
        $String = md5($String);
        //echo "【string3】 ".$String."</br>";
        //签名步骤四：所有字符转为大写
        $result_ = strtoupper($String);
        //echo "【result】 ".$result_."</br>";
        return $result_;
    }

    /**
     *    作用：格式化参数，签名过程需要使用
     */
    protected function formatBizQueryParaMap($paraMap, $urlencode)
    {
        $buff = "";
        ksort($paraMap);
        foreach ($paraMap as $k => $v) {
            if ($urlencode) {
                $v = urlencode($v);
            }
            $buff .= $k . "=" . $v . "&";
        }
        $reqPar = '';
        if (strlen($buff) > 0) {
            $reqPar = substr($buff, 0, strlen($buff) - 1);
        }
        return $reqPar;
    }
    /**
     *     作用：将xml转为array
     */
    protected function xmlToArray($xml)
    {
        //将XML转为array
        $array_data = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
        return $array_data;
    }
    /**
     *     作用：array转xml
     */
    protected function arrayToXml($arr)
    {
        $xml = "<xml>";
        foreach ($arr as $key=>$val)
        {
            if (is_numeric($val))
            {
                $xml.="<".$key.">".$val."</".$key.">";

            }
            else
                $xml.="<".$key."><![CDATA[".$val."]]></".$key.">";
        }
        $xml.="</xml>";
        return $xml;
    }
}