前端代码
wx.request({ url: \'https://www.yourhost.com/weixin/WeiActivity/payJoinfee\',//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) } });后端核心代码：
//支付费用 public function payJoinfee(){ $appid=\'wx888888888\'; $openid=\'oCQwY0Q_pzrQpu8888888\'; $mch_id=\'141388888\'; $key=\'9A0A86888888888\'; import(\'Weixin.Lib.WeixinPay\'); $weixinpay = new \WeixinPay($appid,$openid,$mch_id,$key); $return=$weixinpay->pay(); $this->response($return,\'json\'); }微信支付类
<?php /* * 小程序微信支付 */ class WeixinPay{ protected $appid; protected $mch_id; protected $key; protected $openid; function __construct($appid,$openid,$mch_id,$key){ $this->appid=$appid; $this->openid=$openid; $this->mch_id=$mch_id; $this->key=$key; } 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\'=>\'测试\',//商品描述 \'out_trade_no\'=>\'2015450806125346\',//商户订单号 \'total_fee\'=>floatval(0.01*100),//总金额 单位 分 \'spbill_create_ip\'=>$_SERVER[\'REMOTE_ADDR\'],//终端IP \'notify_url\'=>\'http://www.weixin.qq.com/wxpay/pay.php\',//通知地址 \'openid\'=>$this->openid,//用户id \'trade_type\'=>\'JSAPI\'//交易类型 ); //统一下单签名 $parameters[\'sign\']=$this->getSign($parameters); $xmlData=arrayToXml($parameters); $return=xmlToArray(postXmlSSLCurl($xmlData,$url,60)); return $return; } //微信小程序接口 private 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 \'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; } }注：本文转载自【PHP自学中心】微信公众号