PHP 实现 APP 微信支付实例剖析

public function ToXml($data=array())

{

if(!is_array($data) || count($data) <= 0)

{

return &#39;数组异常&#39;;

}

$xml = "<xml>";

foreach ($data as $key=>$val)

{

if (is_numeric($val)){

$xml.="<".$key.">".$val."</".$key.">";

}else{

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

}

}

$xml.="</xml>";

return $xml;

}

function rand_code(){

$str = &#39;0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ&#39;;//62个字符

$str = str_shuffle($str);

$str = substr($str,0,32);

return $str;

}

private function getSign($params) {

ksort($params); //将参数数组按照参数名ASCII码从小到大排序

foreach ($params as $key => $item) {

if (!empty($item)) {  //剔除参数值为空的参数

$newArr[] = $key.&#39;=&#39;.$item; // 整合新的参数数组

}

}

$stringA = implode("&", $newArr);  //使用 & 符号连接参数

$stringSignTemp = $stringA."&key="."************************"; //拼接key

// key是在商户平台API安全里自己设置的

$stringSignTemp = MD5($stringSignTemp); //将字符串进行MD5加密

$sign = strtoupper($stringSignTemp); //将所有字符转换为大写

return $sign;

}

public function wx_pay() {

$nonce_str = $this->rand_code(); //调用随机字符串生成方法获取随机字符串

$data[&#39;appid&#39;] =&#39;wxdbc5dc*******&#39;; //appid

$data[&#39;mch_id&#39;] = &#39;1493*****&#39; ; //商户号

$data[&#39;body&#39;] = "APP支付测试";

$data[&#39;spbill_create_ip&#39;] = $_SERVER[&#39;HTTP_HOST&#39;]; //ip地址

$data[&#39;total_fee&#39;] = 1;    //金额

$data[&#39;out_trade_no&#39;] = time().mt_rand(10000,99999); //商户订单号,不能重复

$data[&#39;nonce_str&#39;] = $nonce_str;   //随机字符串

$data[&#39;notify_url&#39;] = &#39;http://xxx.xxx.com/wx_notify&#39;; //回调地址,用户接收支付后的通知,必须为能直接访问的网址,不能跟参数

$data[&#39;trade_type&#39;] = &#39;APP&#39;; //支付方式

//将参与签名的数据保存到数组 注意：以上几个参数是追加到$data中的，$data中应该同时包含开发文档中要求必填的剔除sign以外的所有数据

$data[&#39;sign&#39;] = $this->getSign($data); //获取签名

$xml = $this->ToXml($data);  //数组转xml

//curl 传递给微信方

$url = "https://api.mch.weixin.qq.com/pay/unifiedorder";

//header("Content-type:text/xml");

$ch = curl_init();

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_SSLVERSION, CURL_SSLVERSION_TLSv1);

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);

//设置超时

curl_setopt($ch, CURLOPT_TIMEOUT, 30);

curl_setopt($ch, CURLOPT_POST, TRUE);

//传输文件

curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);

//运行curl

$data = curl_exec($ch);

//返回结果

if($data){

curl_close($ch);

//返回成功,将xml数据转换为数组.

$re = $this->FromXml($data);

if($re[&#39;return_code&#39;] != &#39;SUCCESS&#39;){

json("201",&#39;签名失败&#39;);

}

else{

//接收微信返回的数据,传给APP!

$arr =array(

&#39;prepayid&#39; =>$re[&#39;prepay_id&#39;],

&#39;appid&#39; => &#39;wxdbc5dc*****&#39;,

&#39;partnerid&#39; => &#39;14937****&#39;,

&#39;package&#39; => &#39;Sign=WXPay&#39;,

&#39;noncestr&#39; => $nonce_str,

&#39;timestamp&#39; =>time(),

);

//第二次生成签名

$sign = $this->getSign($arr);

$arr[&#39;sign&#39;] = $sign;

json(&#39;200&#39;,&#39;签名成功&#39;,$arr);

}

} else {

$error = curl_errno($ch);

curl_close($ch);

json(&#39;201&#39;,"curl出错，错误码:$error");

}

}

public function FromXml($xml)

{

if(!$xml){

echo "xml数据异常！";

}

//将XML转为array

//禁止引用外部xml实体

libxml_disable_entity_loader(true);

$data = json_decode(json_encode(simplexml_load_string($xml, &#39;SimpleXMLElement&#39;, LIBXML_NOCDATA)), true);

return $data<