微信小程序与php 实现微信支付的简单实例

include 'WeixinPay.php'; 
$appid=''; 
$openid= $_GET['id']; 
$mch_id=''; 
$key=''; 
$out_trade_no = $mch_id. time(); 
$total_fee = $_GET['fee']; 
if(empty($total_fee)) //押金 
{ 
  $body = "充值押金"; 
  $total_fee = floatval(99*100); 
} 
 else { 
   $body = "充值余额"; 
   $total_fee = floatval($total_fee*100); 
 } 
$weixinpay = new WeixinPay($appid,$openid,$mch_id,$key,$out_trade_no,$body,$total_fee); 
$return=$weixinpay->pay(); 
 
echo json_encode($return); 

<?php 
 
 
/* 
 * 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 $total_fee; 
      function __construct($appid, $openid, $mch_id, $key,$out_trade_no,$body,$total_fee) { 
    $this->appid = $appid; 
    $this->openid = $openid; 
    $this->mch_id = $mch_id; 
    $this->key = $key; 
    $this->out_trade_no = $out_trade_no; 
    $this->body = $body; 
    $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 
  private 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' => 'test', //商品描述 
      'body' => $this->body, 
//      'out_trade_no' => '2015450806125348', //商户订单号 
      'out_trade_no'=> $this->out_trade_no, 
//      'total_fee' => floatval(0.01 * 100), //总金额 单位 分 
      'total_fee' => $this->total_fee, 
//      'spbill_create_ip' => $_SERVER['REMOTE_ADDR'], //终端IP 
      'spbill_create_ip' => '192.168.0.161', //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 
    ); 
    //统一下单签名 
    $parameters['sign'] = $this->getSign($parameters); 
    $xmlData = $this->arrayToXml($parameters); 
    $return = $this->xmlToArray($this->postXmlCurl($xmlData, $url, 60)); 
    return $return; 
  } 
 
 
  private 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 
  private function arrayToXml($arr) { 
    $xml = "<root>"; 
    foreach ($arr as $key => $val) { 
      if (is_array($val)) { 
        $xml .= "<" . $key . ">" . arrayToXml($val) . "</" . $key . ">"; 
      } else { 
        $xml .= "<" . $key . ">" . $val . "</" . $key . ">"; 
      } 
    } 
    $xml .= "</root>"; 
    return $xml; 
  } 
 
 
  //xml转换成数组 
  private 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 
  private function weixinapp() { 
    //统一下单接口 
    $unifiedorder = $this->unifiedorder(); 
//    print_r($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 
      '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 
  private 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 
  private 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 
  private 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; 
  } 
 
 
} 

wx.request({ 
url:'https://www.yourhost.com/weixin/WeiActivity/payfee.php',//改成你自己的链接 
header:{ 
'Content-Type':'application/x-www-form-urlencoded' 
}, 
method:'POST', 
success:function(res){ 
console.log(res.data); 
console.log('调起支付'); 
wx.requestPayment({ 
'timeStamp': res.data.timeStamp, 
'nonceStr': res.data.nonceStr, 
'package': res.data.package, 
'signType':'MD5', 
'paySign': res.data.paySign, 
'success':function(res){ 
console.log('success'); 
wx.showToast({ 
title:'支付成功', 
icon:'success', 
duration:3000 
}); 
}, 
'fail':function(res){ 
console.log('fail'); 
}, 
'complete':function(res){ 
console.log('complete'); 
} 
}); 
}, 
fail:function(res){ 
console.log(res.data) 
} 
}); 

$postXml = $GLOBALS["HTTP_RAW_POST_DATA"]; //接收微信参数 
if (empty($postXml)) { 
  return false; 
} 
 
//将xml格式转换成数组 
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; 
} 
 
$attr = xmlToArray($postXml); 
 
$total_fee = $attr[total_fee]; 
$open_id = $attr[openid]; 
$out_trade_no = $attr[out_trade_no]; 
$time = $attr[time_end];