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php小程序支付

程序员文章站 2022-07-13 17:08:15
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1.基本逻辑

小程序端先请求后端接口
后端接口生成相应参数,返回给小程序端
小程序端调用wx.requestPayment发起支付

小程序示例代码:

wx.requestPayment(
{
	'timeStamp': '',     //时间戳
	'nonceStr': '',      //随机字符串,长度为32个字符以下。
	'package': '',       //后端返回的 prepay_id 参数值,格式如:prepay_id=*
	'signType': 'MD5',   //签名类型默认MD5
	'paySign': '',       //签名
	
	//以上参数由后端生成返回
	'success':function(res){          //支付成功
	},
	'fail':function(res){            //支付失败
	},
	'complete':function(res){        //支付完成,不管成功失败都会响应
	}
})

2. tp5代码


        $appid            =    $res['appid'];         //小程序appid
        $body             =    '订单支付';
        $mch_id           =                           // 商户号    公众平台商户号需绑定到小程序上
        $nonce_str        =    $this->nonce_str();    //  随机字符串
        $notify_url       =    '' ;                   //回调地址
        $openid           =    $this->openID;         //用户openid
        $out_trade_no     =    '';                    //订单号
        $spbill_create_ip =    $_SERVER['REMOTE_ADDR'];
        $total_fee        =    $money*100;            //支付金额需要乘以100
        $trade_type       =    'JSAPI';
		
		//按照顺序生成签名
	        $post1['appid']               =      $appid;
	        $post1['body']                =      $body;
	        $post1['mch_id']              =      $mch_id;
	        $post1['nonce_str']          =      $nonce_str;
	        $post1['notify_url']         =      $notify_url;
	        $post1['openid']             =       $openid;
	        $post1['out_trade_no']       =      $out_trade_no;
	        $post1['spbill_create_ip']  =      $spbill_create_ip;
	        $post1['total_fee']          =      $total_fee;//
	        $post1['trade_type']         =      $trade_type;
        
        $sign             =    $this->sign($post1);         //签名

		//生成xml数据
	    $post_xml =
	      '<xml>
	       <appid>'.$appid.'</appid>
	       <body>'.$body.'</body>
	       <mch_id>'.$mch_id.'</mch_id>
	       <nonce_str>'.$nonce_str.'</nonce_str>
	       <notify_url>'.$notify_url.'</notify_url>
	       <openid>'.$openid.'</openid>
	       <out_trade_no>'.$out_trade_no.'</out_trade_no>
	       <spbill_create_ip>'.$spbill_create_ip.'</spbill_create_ip>
	       <total_fee>'.$total_fee.'</total_fee>
	       <trade_type>'.$trade_type.'</trade_type>
	       <sign>'.$sign.'</sign>
	       </xml> ';
		
		//调用微信接口下单  得到prepay_id
		$url = 'https://api.mch.weixin.qq.com/pay/unifiedorder';   
            //请求成功后微信会返回一个xml 里面包含prepay_id
            $xml = $this->http_request($url,$post_xml);
            $array = $this->xml($xml);//全要大写
            
		//结果分析
		 if( $array['RETURN_CODE'] ==  'SUCCESS' && $array['RESULT_CODE'] == 'SUCCESS'){
			    $tmp                   =    [];          //临时数组用于签名
                $tmp['appId']          =    $appid;
                $tmp['nonceStr']       =    $nonce_str;
                $tmp['package']        =    'prepay_id='.$array['PREPAY_ID'];
                $tmp['signType']       =    'MD5';
                $tmp['timeStamp']      =    strval($time);
                
                $data['prepay_id']     =    $array['PREPAY_ID'];
                $data['timeStamp']     =    strval(time());         //时间戳  此处转化为字符串模式返回
                $data['nonceStr']      =    $nonce_str;           //随机字符串
                $data['signType']      =    'MD5';               //签名算法,暂支持 MD5
                $data['package']       =    'prepay_id='.$array['PREPAY_ID'];// 接口返回的 prepay_id 参数值,
                $data['paySign']       =    $this->sign($tmp);   //签名
                $data['out_trade_no']  =    $out_trade_no;
                
            }else{
                $data['state']         =   0;
                $data['text']          =   "错误";
                $data['RETURN_CODE']  =   $array['RETURN_CODE'];
                $data['RETURN_MSG']   =   $array['RETURN_MSG'];
            }
            
        echo json_encode($data);

获取nonce_str

 	public function nonce_str(){
        $result = '';
        $str = 'QWERTYUIOPASDFGHJKLZXVBNMqwertyuioplkjhgfdsamnbvcxz';
        for ($i=0;$i<32;$i++){
            $result .= $str[rand(0,48)];
        }
        return $result;
    }

获取openid

public function openID(){
	$code= 小程序端通过wx.login获得
	//
			wx.login({
		      success: function(res) {
		        // 成功的话会返回:
		        // {errMsg: "login:ok", code: "获取用户OpenID的ticket"}
		       var code  =res.code   //将code发送给后端
		      }
		    })
	//
	
	 $WX_APPID   =  '';   //小程序appid
	 $WX_SECRET  =  '';  //小程序appsecret
	 $url        =  "https://api.weixin.qq.com/sns/jscode2session?appid=" . $WX_APPID . "&secret=" . $WX_SECRET . "&js_code=" . $code . "&grant_type=authorization_code";
	 $infos      =  json_decode(file_get_contents($url));
	 $openid     =  $infos->openid;
	 return  $openid;
}	 

获取签名

public function sign($data){
        $stringA = '';
        foreach ($data as $key=>$value){
            if(!$value) continue;
            if($stringA){
                $stringA .= '&'.$key."=".$value;
            } else{
                $stringA  = $key."=".$value;
            }
        }
        $wx_key         = '';    //支付**
        $stringSignTemp = $stringA.'&key='.$wx_key;
        return strtoupper(md5($stringSignTemp));
    }

http请求

    function http_request($url,$data = null,$headers=array())
    {
        $curl = curl_init();
        if( count($headers) >= 1 ){
            curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
        }
        curl_setopt($curl, CURLOPT_URL, $url);
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE);
        if (!empty($data)){
            curl_setopt($curl, CURLOPT_POST, 1);
            curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
        }
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
        $output = curl_exec($curl);
        curl_close($curl);
        return $output;
    }

得到xml

public function xml($xml){
        $p = xml_parser_create();
        xml_parse_into_struct($p, $xml, $vals, $index);
        xml_parser_free($p);
        $data = "";
        foreach ($index as $key=>$value) {
            if($key == 'xml' || $key == 'XML') continue;
            $tag = $vals[$value[0]]['tag'];
            $value = $vals[$value[0]]['value'];
            $data[$tag] = $value;
        }
        return $data;
    }