ThinkPHP5 对接 APP 微信支付

model 或 extend 中：

以在 extend 中为例：

1、配置参数：

namespace wxpay;

class WxPay
{
	private $config = array(
		'appid' => "",  // 微信开放平台上的应用id
		'mch_id' => "", // 微信申请成功之后的商户号
		'api_key' => "" // 在微信商户平台上自己设定的32位api密钥
	);

2、发起预支付订单

/**
 * 发起预支付订单
 * 
 * $body 订单描述
 * $out_trade_no 订单号
 * $total_fee 订单金额，单位为 分
 * $notify_url 异步通知回调地址
 */
public function getPrePayOrder($body, $out_trade_no, $total_fee, $notify_url)
{
	$url = "https://api.mch.weixin.qq.com/pay/unifiedorder";
	
	$onoce_str = $this->getRandChar(32);
	
	$data["appid"] = $this->config["appid"];
	$data["body"] = $body;
	$data["mch_id"] = $this->config['mch_id'];
	$data["nonce_str"] = $onoce_str;
	$data["notify_url"] = $notify_url;
	$data["out_trade_no"] = $out_trade_no;
	$data["spbill_create_ip"] = $this->get_client_ip();
	$data["total_fee"] = $total_fee;
	$data["trade_type"] = "APP";
	$s = $this->getSign($data, false);
	$data["sign"] = $s;
	$xml = $this->arrayToXml($data);
	$response = $this->postXmlCurl($xml, $url);
	
	//将微信返回的结果xml转成数组
	return $this->xmltoarray($response);
}

3、执行第二次签名，才能返回给客户端使用

public function getOrder($prepayId)
{
	$data["appid"] = $this->config["appid"];
	$data["noncestr"] = $this->getRandChar(32);;
	$data["package"] = "Sign=WXPay";
	$data["partnerid"] = $this->config['mch_id'];
	$data["prepayid"] = $prepayId;
	$data["timestamp"] = time();
	$sign = $this->getSign($data, false);
	$data["sign"] = $sign;
	
	return $data;
}

4、剩余代码

//生成签名
function getSign($obj)
{
	foreach ($obj as $k => $v) {
		$Parameters[strtolower($k)] = $v;
	}
	ksort($Parameters);
	$String = $this->formatBizQueryParaMap($Parameters, false);
	$String = $String."&key=".$this->config['api_key'];
	//签名步骤三：MD5加密
	$result = strtoupper(md5($String));
	return $result;
}
//获取指定长度的随机字符串
function getRandChar($length)
{
	$str = null;
	$strPol = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz";
	$max = strlen($strPol) - 1;
	//rand($min,$max)生成介于min和max两个数之间的一个随机整数
	for ($i=0;$i<$length;$i++) {
		$str. = $strPol[rand(0,$max)];
	}
	return $str;
}
//数组转xml
function arrayToXml($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 $xml;
}
//post https请求，CURLOPT_POSTFIELDS xml 格式
function postXmlCurl($xml, $url, $second = 30)
{
	//初始化curl
	$ch = curl_init();
	//超时时间
	curl_setopt($ch,CURLOPT_TIMEOUT,$second);
	//这里设置代理，如果有的话
	//curl_setopt($ch,CURLOPT_PROXY, '8.8.8.8');
	//curl_setopt($ch,CURLOPT_PROXYPORT, 8080);
	curl_setopt($ch,CURLOPT_URL, $url);
	curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,FALSE);
	curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,FALSE);
	//设置header
	curl_setopt($ch, CURLOPT_HEADER, FALSE);
	//要求结果为字符串且输出到屏幕上
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
	//post提交方式
	curl_setopt($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);
		echo "curl出错，错误码:$error"."<br>";
		echo "<a href='http://curl.haxx.se/libcurl/c/libcurl-errors.html'>错误原因查询</a></br>";
		curl_close($ch);
		return false;
	}
}
//获取当前服务器的IP
function get_client_ip()
{
	if ($_SERVER['REMOTE_ADDR']) {
		$cip = $_SERVER['REMOTE_ADDR'];
	} elseif (getenv("REMOTE_ADDR")) {
		$cip = getenv("REMOTE_ADDR");
	} elseif (getenv("HTTP_CLIENT_IP")) {
		$cip = getenv("HTTP_CLIENT_IP");
	} else {
		$cip = "unknown";
	}
	return $cip;
}
//将数组转成uri字符串
function formatBizQueryParaMap($paraMap, $urlencode)
{
	$buff = "";
	ksort($paraMap);
	foreach ($paraMap as $k => $v) {
		if ($urlencode) {
			$v = urlencode($v);
		}
		$buff. = strtolower($k) . "=" . $v . "&";
	}
	$reqPar;
	if (strlen($buff) > 0) {
		$reqPar = substr($buff, 0, strlen($buff)-1);
	}
	return $reqPar;
}
//xml转成数组
public function xmltoarray($xml)
{
	//禁止引用外部xml实体
	libxml_disable_entity_loader(true);
	$xmlstring = simplexml_load_string($xml,'SimpleXMLElement', LIBXML_NOCDATA);
	$val = json_decode(json_encode($xmlstring),true);
	return $val;
}
function domnode_to_array($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;
}
//此类结束
}

controller 中：

以从 extend 中调用为例：

use wxpay\Wxpay;

发起支付订单

public function wxPay()
{
	$amount = $this->request->post('amount');
	$amount = $amount * 100; // 微信支付以分为单位
	$out_trade_no = date('YmdHis').rand(000, 999);
	$notifyUrl = ""; // 异步通知回调地址
	$desc = "订单描述";
	
	/**
	 * 此处根据自己的业务逻辑插入一条订单数据
	 * ……
	 * /
	$pay = new Wxpay();
	//统一下单
	$p = $pay->getPrePayOrder($desc, $out_trade_no, $amount, $notifyUrl);
	
	//第二次处理数据以拉起微信支付
	$data = $pay->getOrder($p['prepay_id']);
	return json_encode(['code' => 200, 'msg' => '订单创建成功', 'data' => $data]);
}