生成xml访问第三方接口

使用：

$this->data['time_start'] = date('YmdHis',time());
$this->data['notify_url'] = $this->_new_notify_url;
$this->data['out_trade_no'] =$this->random_str;
$this->data['total_fee'] = $this->total_fee;
$this->data['notify_url'] = 'https://sungroow.com/phone/pay/Wxpay/api/notify.php';
$this->data['nonce_str'] = $this->nonce_str;
$this->data['openid'] = $this->openId;
$this->data['sign'] = $this->_get_sign();
$this->xmlData = $this->_get_xml();
$this->_curl();

//请求并解析放回数据

private function _curl(){
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_URL, $this->url); //定义表单提交地址
    curl_setopt($curl, CURLOPT_POST, 1);   //定义提交类型 1：POST ；0：GET
    curl_setopt($curl, CURLOPT_HEADER, 0); //定义是否显示状态头 1：显示 ； 0：不显示
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);//定义是否直接输出返回流
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($curl, CURLOPT_HTTPHEADER, 'Content-type: text/xml');
    curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
    curl_setopt($curl, CURLOPT_POSTFIELDS, $this->xmlData); //定义提交的数据，这里是XML文件
    $returnData = curl_exec($curl);
    curl_close($curl);
    $returnData = $this->xmlstr_to_array($returnData);
    if(!empty($returnData['err_code_des'])){
        output_error('请按首次操作微信支付');
    }

重点：.

//将数组转换成XML格式
private function _get_xml(){
    $xml = '<xml>';
    foreach ($this->data as $key=>$val){
        if (is_numeric($val)){  //检测变量是否为数字或数字字符串
            $xml.="<".$key.">".$val."</".$key.">";
        }else{
            $xml.="<".$key."><![CDATA[".$val."]]></".$key.">";
        }
    }
    $xml .= '</xml>';
    return $xml;
}

//将返回的XMl解析成数组
private function xmlstr_to_array($xmlstr) {
    $doc = new DOMDocument();
    $doc->loadXML($xmlstr);
    return $this->domnode_to_array($doc->documentElement);
}

//将返回的XMl解码
private function domnode_to_array($node) {
    $output = array();
    switch ($node->nodeType) {
        case XML_CDATA_SECTION_NODE:
        case XML_TEXT_NODE:
            $output = trim($node->textContent);
            break;
        case XML_ELEMENT_NODE:
            for ($i=0, $m=$node->childNodes->length; $i<$m; $i++) {
                $child = $node->childNodes->item($i);
                $v = $this->domnode_to_array($child);
                if(isset($child->tagName)) {
                    $t = $child->tagName;
                    if(!isset($output[$t])) {
                        $output[$t] = array();
                    }
                    $output[$t][] = $v;
                }
                elseif($v) {
                    $output = (string) $v;
                }
            }
            if(is_array($output)) {
                if($node->attributes->length) {
                    $a = array();
                    foreach($node->attributes as $attrName => $attrNode) {
                        $a[$attrName] = (string) $attrNode->value;
                    }
                    $output['@attributes'] = $a;
                }
                foreach ($output as $t => $v) {
                    if(is_array($v) && count($v)==1 && $t!='@attributes') {
                        $output[$t] = $v[0];
                    }
                }
            }
            break;
    }
    return $output;
}

附加：

//随机32位字符串
    private function nonce_str(){
        $result = '';
        $str = 'QWERTYUIOPASDFGHJKLZXVBNMqwertyuioplkjhgfdsamnbvcxz';
        for ($i=0;$i<32;$i++){
            $result .= $str[rand(0,48)];
        }
        return $result;
    }


//正确生成微信签名：

$time = time();
$tmp='';//临时数组用于签名
$tmp['appId'] = 'wx3670f6b94f08b57e';
$tmp['nonceStr'] = $this->nonce_str;
$tmp['package'] = 'prepay_id='.$returnData['prepay_id'];
$tmp['signType'] = 'MD5';
$tmp['timeStamp'] = "$time";

$data['test']=$returnData;
$data['state'] = 200;
$data['timeStamp'] = "$time";//时间戳
$data['nonceStr'] = $this->nonce_str;//随机字符串
$data['signType'] = 'MD5';//签名算法，暂支持 MD5
$data['package'] = 'prepay_id='.$returnData['prepay_id'];//统一下单接口返回的 prepay_id 参数值，提交格式如：prepay_id=*
$data['paySign'] = $this->sign($tmp);//签名,具体签名方案参见微信公众号支付帮助文档;
$data['out_trade_no'] = $this->random_str;

    //签名 $data要先排好顺序
    private function sign($data){
        $stringA = '';
        foreach ($data as $key=>$value){
            if(!$value) continue;
            if($stringA) $stringA .= '&'.$key."=".$value;
            else $stringA = $key."=".$value;
        }
        $wx_key = '';//申请支付后有给予一个商户账号和密码，登陆后自己设置的key
        $stringSignTemp = $stringA.'&key='.$wx_key;
        return strtoupper(md5($stringSignTemp));
    }