小程序访问地址： 
payfee.PHP:

1. [php] view plain copy
2. include 'WeixinPay.php';
3. $appid='';
4. $openid= $_GET['id'];
5. $mch_id='';
6. $key='';
7. $out_trade_no = $mch_id. time();
8. $total_fee = $_GET['fee'];
9. if(empty($total_fee)) //押金
10. {
11. $body = "充值押金";
12. $total_fee = floatval(99*100);
13. }
14. else {
15. $body = "充值余额";
16. $total_fee = floatval($total_fee*100);
17. }
18. $weixinpay = new WeixinPay($appid,$openid,$mch_id,$key,$out_trade_no,$body,$total_fee);
19. $return=$weixinpay->pay();
20.  
21. echo json_encode($return);

WeixinPay.php:

1. [php] view plain copy
2. <?php
3.  
4.  
5. /*
6. * 小程序微信支付
7. */
8.  
9.  
10. class WeixinPay {
11.  
12.  
13. protected $appid;
14. protected $mch_id;
15. protected $key;
16. protected $openid;
17. protected $out_trade_no;
18. protected $body;
19. protected $total_fee;
20. function __construct($appid, $openid, $mch_id, $key,$out_trade_no,$body,$total_fee) {
21. $this->appid = $appid;
22. $this->openid = $openid;
23. $this->mch_id = $mch_id;
24. $this->key = $key;
25. $this->out_trade_no = $out_trade_no;
26. $this->body = $body;
27. $this->total_fee = $total_fee;
28. }
29.  
30.  
31. public function pay() {
32. //统一下单接口
33. $return = $this->weixinapp();
34. return $return;
35. }