CodeIgniter微信支付(jsapi)

1、在application/config/config.php新增配置代码

$config[‘mchid’] = ‘1252530502’;
$config[‘appid’] = ‘wx5fd494dff1aab5e2’;
$config[‘appKey’] = ‘5ea4b62cdae0fe3ddf7b3bd5033ef1f7’;
$config[‘apiKey’] = ‘su6e5168suye5168suze5198suue5197’;

2、创建类库，在 application/libraries 目录下新建Wxpay_jsapi.php文件

<?php
defined(‘BASEPATH’) OR exit(‘No direct script access allowed’);

class Wxpay_jsapi {

protected $mchid;
protected $appid;
protected $appKey;
protected $apiKey;
public $data = null;
public function __construct($params)
{
$this->mchid = $params[‘mchid’]; //https://pay.weixin.qq.com 产品中心-开发配置-商户号
$this->appid = $params[‘appid’]; //微信支付申请对应的公众号的APPID
$this->appKey = $params[‘appKey’]; //微信支付申请对应的公众号的APP Key
$this->apiKey = $params[‘apiKey’]; //https://pay.weixin.qq.com 帐户设置-安全设置-API安全-API密钥-设置API密钥
}
/**
* 通过跳转获取用户的openid，跳转流程如下：
* 1、设置自己需要调回的url及其其他参数，跳转到微信服务器https://open.weixin.qq.com/connect/oauth2/authorize
* 2、微信服务处理完成之后会跳转回用户redirect_uri地址，此时会带上一些参数，如：code
* @return 用户的openid
*/
public function GetOpenid()
{
//通过code获得openid
if (!isset($_GET[‘code’])){
//触发微信返回code码
//$scheme = $_SERVER[‘HTTPS’]==’on’ ? ‘https://’ : ‘http://’;
if(isset($_SERVER[‘HTTPS’])){
$scheme = ‘https://’;
}else{
$scheme = ‘http://’;
}
$uri = $_SERVER[‘PHP_SELF’].$_SERVER[‘QUERY_STRING’];
if($_SERVER[‘REQUEST_URI’]) $uri = $_SERVER[‘REQUEST_URI’];
$baseUrl = urlencode($scheme.$_SERVER[‘HTTP_HOST’].$uri);
$url = $this->__CreateOauthUrlForCode($baseUrl);
Header(“Location: $url”);
exit();
} else {
//获取code码，以获取openid
$code = $_GET[‘code’];
$openid = $this->getOpenidFromMp($code);
return $openid;
}
}
/**
* 通过code从工作平台获取openid机器access_token
* @param string $code 微信跳转回来带上的code
* @return openid
*/
public function GetOpenidFromMp($code)
{
$url = $this->__CreateOauthUrlForOpenid($code);
$res = self::curlGet($url);
//取出openid
$data = json_decode($res,true);

$this->data = $data;
$openid = $data[‘openid’];
return $openid;
}
/**
* 构造获取open和access_toke的url地址
* @param string $code，微信跳转带回的code
* @return 请求的url
*/
private function __CreateOauthUrlForOpenid($code)
{
$urlObj[“appid”] = $this->appid;
$urlObj[“secret”] = $this->appKey;
$urlObj[“code”] = $code;
$urlObj[“grant_type”] = “authorization_code”;
$bizString = $this->ToUrlParams($urlObj);
return “https://api.weixin.qq.com/sns/oauth2/access_token?”.$bizString;
}
/**
* 构造获取code的url连接
* @param string $redirectUrl 微信服务器回跳的url，需要url编码
* @return 返回构造好的url
*/
private function __CreateOauthUrlForCode($redirectUrl)
{
$urlObj[“appid”] = $this->appid;
$urlObj[“redirect_uri”] = “$redirectUrl”;
$urlObj[“response_type”] = “code”;
$urlObj[“scope”] = “snsapi_base”;
$urlObj[“state”] = “STATE”.”#wechat_redirect”;
$bizString = $this->ToUrlParams($urlObj);
return “https://open.weixin.qq.com/connect/oauth2/authorize?”.$bizString;
}
/**
* 拼接签名字符串
* @param array $urlObj
* @return 返回已经拼接好的字符串
*/
private function ToUrlParams($urlObj)
{
$buff = “”;
foreach ($urlObj as $k => $v)
{
if($k != “sign”) $buff .= $k . “=” . $v . “&”;
}
$buff = trim($buff, “&”);
return $buff;
}
/**
* 统一下单
* @param string $openid 调用【网页授权获取用户信息】接口获取到用户在该公众号下的Openid
* @param float $totalFee 收款总费用单位元
* @param string $outTradeNo 唯一的订单号
* @param string $orderName 订单名称
* @param string $notifyUrl 支付结果通知url 不要有问号
* @param string $timestamp 支付时间
* @return string
*/
public function createJsBizPackage($openid, $totalFee, $outTradeNo, $orderName, $notifyUrl, $timestamp)
{
$config = array(
‘mch_id’ => $this->mchid,
‘appid’ => $this->appid,
‘key’ => $this->apiKey,
);
//$orderName = iconv(‘GBK’,’UTF-8′,$orderName);
$unified = array(
‘appid’ => $config[‘appid’],
‘attach’ => ‘pay’, //商家数据包，原样返回，如果填写中文，请注意转换为utf-8
‘body’ => $orderName,
‘mch_id’ => $config[‘mch_id’],
‘nonce_str’ => self::createNonceStr(),
‘notify_url’ => $notifyUrl,
‘openid’ => $openid, //rade_type=JSAPI，此参数必传
‘out_trade_no’ => $outTradeNo,
‘spbill_create_ip’ => ‘127.0.0.1’,
‘total_fee’ => intval($totalFee * 100), //单位转为分
‘trade_type’ => ‘JSAPI’,
);
$unified[‘sign’] = self::getSign($unified, $config[‘key’]);
$responseXml = self::curlPost(‘https://api.mch.weixin.qq.com/pay/unifiedorder’, self::arrayToXml($unified));
$unifiedOrder = simplexml_load_string($responseXml, ‘SimpleXMLElement’, LIBXML_NOCDATA);
if ($unifiedOrder === false) {
die(‘parse xml error’);
}
if ($unifiedOrder->return_code != ‘SUCCESS’) {
die($unifiedOrder->return_msg);
}
if ($unifiedOrder->result_code != ‘SUCCESS’) {
die($unifiedOrder->err_code);
}
$arr = array(
“appId” => $config[‘appid’],
“timeStamp” => “$timestamp”, //这里是字符串的时间戳，不是int，所以需加引号
“nonceStr” => self::createNonceStr(),
“package” => “prepay_id=” . $unifiedOrder->prepay_id,
“signType” => ‘MD5’,
);
$arr[‘paySign’] = self::getSign($arr, $config[‘key’]);
return $arr;
}
public static function curlGet($url = ”, $options = array())
{
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_TIMEOUT, 30);
if (!empty($options)) {
curl_setopt_array($ch, $options);
}
//https请求不验证证书和host
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
$data = curl_exec($ch);
curl_close($ch);
return $data;
}
public static function curlPost($url = ”, $postData = ”, $options = array())
{
if (is_array($postData)) {
$postData = http_build_query($postData);
}
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
curl_setopt($ch, CURLOPT_TIMEOUT, 30); //设置cURL允许执行的最长秒数
if (!empty($options)) {
curl_setopt_array($ch, $options);
}
//https请求不验证证书和host
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
$data = curl_exec($ch);
curl_close($ch);
return $data;
}
public static function createNonceStr($length = 16)
{
$chars = ‘abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789’;
$str = ”;
for ($i = 0; $i < $length; $i++) {
$str .= substr($chars, mt_rand(0, strlen($chars) – 1), 1);
}
return $str;
}
public static function arrayToXml($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 $xml;
}
public static function getSign($params, $key)
{
ksort($params, SORT_STRING);
$unSignParaString = self::formatQueryParaMap($params, false);
$signStr = strtoupper(md5($unSignParaString . “&key=” . $key));
return $signStr;
}
protected static function formatQueryParaMap($paraMap, $urlEncode = false)
{
$buff = “”;
ksort($paraMap);
foreach ($paraMap as $k => $v) {
if (null != $v && “null” != $v) {
if ($urlEncode) {
$v = urlencode($v);
}
$buff .= $k . “=” . $v . “&”;
}
}
$reqPar = ”;
if (strlen($buff) > 0) {
$reqPar = substr($buff, 0, strlen($buff) – 1);
}
return $reqPar;
}
public function notify()
{
$config = array(
‘mch_id’ => $this->mchid,
‘appid’ => $this->appid,
‘key’ => $this->apiKey,
);
$postStr = file_get_contents(‘php://input’);
$postObj = simplexml_load_string($postStr, ‘SimpleXMLElement’, LIBXML_NOCDATA);
if ($postObj === false) {
die(‘parse xml error’);
}
if ($postObj->return_code != ‘SUCCESS’) {
die($postObj->return_msg);
}
if ($postObj->result_code != ‘SUCCESS’) {
die($postObj->err_code);
}
$arr = (array)$postObj;
unset($arr[‘sign’]);
if (self::getSign($arr, $config[‘key’]) == $postObj->sign) {
echo ‘<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>’;
return $arr;
}
}
}

3、在控制器的方法中使用

<?php
defined(‘BASEPATH’) OR exit(‘No direct script access allowed’);

class Main extends CI_Controller {

public function __construct()
{
parent::__construct();
$this->load->library(‘session’);
$this->load->helper(‘url’);
}
public function dopay(){
$base_url = $this->config->item(‘base_url’);

$mchid = $this->config->item(‘mchid’); //微信支付商户号 PartnerID 通过微信支付商户资料审核后邮件发送
$appid = $this->config->item(‘appid’); //微信支付申请对应的公众号的APPID
$appKey = $this->config->item(‘appKey’); //微信支付申请对应的公众号的APP Key
$apiKey = $this->config->item(‘apiKey’); //https://pay.weixin.qq.com 帐户设置-安全设置-API安全-API密钥-设置API密钥
$params = array(‘mchid’ => $mchid, ‘appid’ => $appid, ‘appKey’ => $appKey, ‘apiKey’ => $apiKey);
$this->load->library(‘Wxpay_jsapi’, $params);
//①、获取用户openid
$openId = $this->wxpay_jsapi->GetOpenid(); //获取openid
if(!$openId) exit(‘获取openid失败’);
//②、统一下单
$outTradeNo = uniqid(); //你自己的商品订单号
$payAmount = 0.01; //付款金额，单位:元
$orderName = ‘支付测试’; //订单标题
$notifyUrl = $base_url.’Main/notify’; //付款成功后的回调地址(不要有问号)
$payTime = time(); //付款时间
$jsApiParameters = $this->wxpay_jsapi->createJsBizPackage($openId,$payAmount,$outTradeNo,$orderName,$notifyUrl,$payTime);
$jsApiParameters = json_encode($jsApiParameters);

$this->load->view(‘select.html’,array(‘base_url’=>$base_url,’jsApiParameters’=>$jsApiParameters,’title’=>’服务选择’));
}
public function notify(){
$mchid = $this->config->item(‘mchid’); //微信支付商户号 PartnerID 通过微信支付商户资料审核后邮件发送
$appid = $this->config->item(‘appid’); //微信支付申请对应的公众号的APPID
$appKey = $this->config->item(‘appKey’); //微信支付申请对应的公众号的APP Key
$apiKey = $this->config->item(‘apiKey’); //https://pay.weixin.qq.com 帐户设置-安全设置-API安全-API密钥-设置API密钥
$params = array(‘mchid’ => $mchid, ‘appid’ => $appid, ‘appKey’ => $appKey, ‘apiKey’ => $apiKey);
$this->load->library(‘Wxpay_jsapi’, $params);
$result = $this->wxpay_jsapi->notify();
if($result){
//完成你的逻辑
//例如连接数据库，获取付款金额$result[‘cash_fee’]，获取订单号$result[‘out_trade_no’]，修改数据库中的订单状态等;
$str= “订单号:”.$result[‘out_trade_no’].” 付款金额:”.$result[‘cash_fee’]/100;
$file_pointer = fopen(“aa.txt”,”a+”);
fwrite($file_pointer,$str);
fclose($file_pointer);
}else{
echo ‘pay error’;
}
}
}
4、在application/views/视图文件中的实例代码

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