小程序微信支付php案例

本文方便使用php环境的会员增加一个参考对象

作者：未署名，来自原文地址

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;
    }
}