微信小程序-微信支付(可直接使用)

PHP端：
微信支付控制器

namespace app\pay\controller;
/*
 * 小程序微信支付
 */
class WeixinPay{
  protected $appid;
  protected $mch_id;
  protected $key;
  protected $openid;
  protected $out_trade_no;
  protected $body;
  protected $total_fee; 

  public function __construct($openid,$out_trade_no,$body,$total_fee){
    $this->appid = '';
    $this->openid = $openid;
    $this->mch_id = ''; //商户号
    $this->key = ''; //这个是你商户号的api秘钥，在产品中心里边找，
    $this->out_trade_no = $out_trade_no; //这个我是用的我后台的订号
    $this->body = $body; //支付时显示的提示
    $this->total_fee = $total_fee;
  }
  public function pay(){
    //统一下单接口
    $return = $this->weixinapp();
    return $return;
  }
  //统一下单接口
  protected function unifiedorder(){
    $url = 'https://api.mch.weixin.qq.com/pay/unifiedorder';
    $parameters = array(
      'appid' => $this->appid, //小程序ID
      'mch_id' => $this->mch_id, //商户号
      'nonce_str' => $this->createNoncestr(), //随机字符串
      'body' => $this->body, //商品描述
      'out_trade_no'=> $this->out_trade_no, //商户订单号
      'total_fee' => $this->total_fee, //总金额 单位 分
      'spbill_create_ip' => $_SERVER['REMOTE_ADDR'], //终端IP
      'notify_url' => 'http://www.weixin.qq.com/wxpay/pay.php', //通知地址 确保外网能正常访问
      'openid' => $this->openid, //用户id
      'trade_type' => 'JSAPI'//交易类型 　　　　　　//要是返回该产品权限未开通请在产品中心开通jsAPi他包含的小程序支付
    );
    // dump($parameters);die;
    //统一下单签名
    $parameters['sign'] = $this->getSign($parameters);
    $xmlData = $this->arrayToXml($parameters);
    $return = $this->xmlToArray($this->postXmlCurl($xmlData, $url, 60));
    // dump($this->out_trade_no);die;
    return $return;
  }
protected static function postXmlCurl($xml, $url, $second = 30){
    $ch = curl_init();
    //设置超时
    curl_setopt($ch, CURLOPT_TIMEOUT, $second);
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE); //严格校验
    //设置header
    curl_setopt($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, $xml);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 20);
    curl_setopt($ch, CURLOPT_TIMEOUT, 40);
    set_time_limit(0);
    //运行curl
    $data = curl_exec($ch);
    //返回结果
    if ($data) {
      curl_close($ch);
      return $data;
    } else {
      $error = curl_errno($ch);
      curl_close($ch);
      throw new WxPayException("curl出错，错误码:$error");
    }
  }
  //数组转换成xml
  protected function arrayToXml($arr) {
    $xml = "";
    foreach ($arr as $key => $val) {
      if (is_array($val)) {
        $xml .= "<" . $key . ">" . arrayToXml($val) . " . $key . ">";
      } else {
        $xml .= "<" . $key . ">" . $val . " . $key . ">";
      }
    }
    $xml .= "";
    return $xml;
  }
  //xml转换成数组
  protected function xmlToArray($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;
  }
  //微信小程序接口
  protected function weixinapp() {
    //统一下单接口
    $unifiedorder = $this->unifiedorder();
    $parameters = array(
      'appId' => $this->appid, //小程序ID
      'timeStamp' => '' . time() . '', //时间戳
      'nonceStr' => $this->createNoncestr(), //随机串
      'package' => 'prepay_id=' . $unifiedorder['prepay_id'], 	//数据包要是返回201则要修改订单号，这个问题测试中容易出现，上线了基本不出现问题
      'signType' => 'MD5'//签名方式
    );
    //签名
    $parameters['paySign'] = $this->getSign($parameters);
    return $parameters;
  }
  //作用：产生随机字符串，不长于32位
  protected function createNoncestr($length = 32) {
    $chars = "abcdefghijklmnopqrstuvwxyz0123456789";
    $str = "";
    for ($i = 0; $i < $length; $i++) {
      $str .= substr($chars, mt_rand(0, strlen($chars) - 1),1);
    }
    return $str;
  }
  //作用：生成签名
  protected function getSign($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);
    //签名步骤二：在string后加入KEY
    $String = $String . "&key=" . $this->key;
    //签名步骤三：MD5加密
    $String = md5($String);
    //签名步骤四：所有字符转为大写
    $result_ = strtoupper($String);
    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;
  }
}

//调用支付接口，显示二维码支付
//价格是以分计算的，不能有小数点，
$pay = new WeixinPay($openid,订单号,标题,价格);
$result = $pay->pay();