php编程之小程序支付所需规避的问题

对于开发一款小程序来说，经常是需要做支付功能的，但是大家在做这个功能的时候，往往会发现遇到很多自己无法解决的问题，那么对于这个问题，我们自己也曾遇到过，下面就跟大家详细来分析解答一下吧。

首先是在商户平台填写支付链接，必须是(http或https开头，最多填写5个);填写回调地址(只能填写一个)，首先我们把官方的demo下载下来放在项目vendor目录下

然后在lib/wxPay.Config.php

设置参数

接下来就是统一下单：因为这里我要用到两次支付，但是支付链接只能有一个地址

本以为数据返回之后，就可以利用wx.requestPayment调用支付了,但是老是会报:签名验证失败

后来上网查过之后才明白小程序wx.requestPayment里的paySign并不是统一下单时候的Sign，而是要重新生成一个签名,生成如下图所示:(现在才知道之前要定义appid了吧)

但是这样写完发现还是不行，报MD5的错误，所以要在js中引入MD5文件(我放在了utils目录下)

Md5.js内容如下:

/***********************************************************************/

/*

* A JavaScript implementation of the RSA Data Security, Inc. MD5 Message

* Digest Algorithm, as defined in RFC 1321.

* Version 1.1 Copyright (C) Paul Johnston 1999 - 2002.

* Code also contributed by Greg Holt

* See http://pajhome.org.uk/site/legal.html for details.

*/

/*

* Add integers, wrapping at 2^32. This uses 16-bit operations internally

* to work around bugs in some JS interpreters.

*/

function safe_add(x, y) {

var lsw = (x & 0xFFFF) + (y & 0xFFFF)

var msw = (x >> 16) + (y >> 16) + (lsw >> 16)

return (msw << 16) | (lsw & 0xFFFF)

}

/*

* Bitwise rotate a 32-bit number to the left.

*/

function rol(num, cnt) {

return (num << cnt) | (num >>> (32 - cnt))

}

/*

* These functions implement the four basic operations the algorithm uses.

*/

function cmn(q, a, b, x, s, t) {

return safe_add(rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b)

}

function ff(a, b, c, d, x, s, t) {

return cmn((b & c) | ((~b) & d), a, b, x, s, t)

}

function gg(a, b, c, d, x, s, t) {

return cmn((b & d) | (c & (~d)), a, b, x, s, t)

}

function hh(a, b, c, d, x, s, t) {

return cmn(b ^ c ^ d, a, b, x, s, t)

}

function ii(a, b, c, d, x, s, t) {

return cmn(c ^ (b | (~d)), a, b, x, s, t)

}

/*

* Calculate the MD5 of an array of little-endian words, producing an array

* of little-endian words.

*/

function coreMD5(x) {

var a = 1732584193

var b = -271733879

var c = -1732584194

var d = 271733878

for (var i = 0; i < x.length; i += 16) {

var olda = a

var oldb = b

var oldc = c

var oldd = d

a = ff(a, b, c, d, x[i + 0], 7, -680876936)

d = ff(d, a, b, c, x[i + 1], 12, -389564586)

c = ff(c, d, a, b, x[i + 2], 17, 606105819)

b = ff(b, c, d, a, x[i + 3], 22, -1044525330)

a = ff(a, b, c, d, x[i + 4], 7, -176418897)

d = ff(d, a, b, c, x[i + 5], 12, 1200080426)

c = ff(c, d, a, b, x[i + 6], 17, -1473231341)

b = ff(b, c, d, a, x[i + 7], 22, -45705983)

a = ff(a, b, c, d, x[i + 8], 7, 1770035416)

d = ff(d, a, b, c, x[i + 9], 12, -1958414417)

c = ff(c, d, a, b, x[i + 10], 17, -42063)

b = ff(b, c, d, a, x[i + 11], 22, -1990404162)

a = ff(a, b, c, d, x[i + 12], 7, 1804603682)

d = ff(d, a, b, c, x[i + 13], 12, -40341101)

c = ff(c, d, a, b, x[i + 14], 17, -1502002290)

b = ff(b, c, d, a, x[i + 15], 22, 1236535329)

a = gg(a, b, c, d, x[i + 1], 5, -165796510)

d = gg(d, a, b, c, x[i + 6], 9, -1069501632)

c = gg(c, d, a, b, x[i + 11], 14, 643717713)

b = gg(b, c, d, a, x[i + 0], 20, -373897302)

a = gg(a, b, c, d, x[i + 5], 5, -701558691)

d = gg(d, a, b, c, x[i + 10], 9, 38016083)

c = gg(c, d, a, b, x[i + 15], 14, -660478335)

b = gg(b, c, d, a, x[i + 4], 20, -405537848)

a = gg(a, b, c, d, x[i + 9], 5, 568446438)

d = gg(d, a, b, c, x[i + 14], 9, -1019803690)

c = gg(c, d, a, b, x[i + 3], 14, -187363961)

b = gg(b, c, d, a, x[i + 8], 20, 1163531501)

a = gg(a, b, c, d, x[i + 13], 5, -1444681467)

d = gg(d, a, b, c, x[i + 2], 9, -51403784)

c = gg(c, d, a, b, x[i + 7], 14, 1735328473)

b = gg(b, c, d, a, x[i + 12], 20, -1926607734)

a = hh(a, b, c, d, x[i + 5], 4, -378558)

d = hh(d, a, b, c, x[i + 8], 11, -2022574463)

c = hh(c, d, a, b, x[i + 11], 16, 1839030562)

b = hh(b, c, d, a, x[i + 14], 23, -35309556)

a = hh(a, b, c, d, x[i + 1], 4, -1530992060)

d = hh(d, a, b, c, x[i + 4], 11, 1272893353)

c = hh(c, d, a, b, x[i + 7], 16, -155497632)

b = hh(b, c, d, a, x[i + 10], 23, -1094730640)

a = hh(a, b, c, d, x[i + 13], 4, 681279174)

d = hh(d, a, b, c, x[i + 0], 11, -358537222)

c = hh(c, d, a, b, x[i + 3], 16, -722521979)

b = hh(b, c, d, a, x[i + 6], 23, 76029189)

a = hh(a, b, c, d, x[i + 9], 4, -640364487)

d = hh(d, a, b, c, x[i + 12], 11, -421815835)

c = hh(c, d, a, b, x[i + 15], 16, 530742520)

b = hh(b, c, d, a, x[i + 2], 23, -995338651)

a = ii(a, b, c, d, x[i + 0], 6, -198630844)

d = ii(d, a, b, c, x[i + 7], 10, 1126891415)

c = ii(c, d, a, b, x[i + 14], 15, -1416354905)

b = ii(b, c, d, a, x[i + 5], 21, -57434055)

a = ii(a, b, c, d, x[i + 12], 6, 1700485571)

d = ii(d, a, b, c, x[i + 3], 10, -1894986606)

c = ii(c, d, a, b, x[i + 10], 15, -1051523)

b = ii(b, c, d, a, x[i + 1], 21, -2054922799)

a = ii(a, b, c, d, x[i + 8], 6, 1873313359)

d = ii(d, a, b, c, x[i + 15], 10, -30611744)

c = ii(c, d, a, b, x[i + 6], 15, -1560198380)

b = ii(b, c, d, a, x[i + 13], 21, 1309151649)

a = ii(a, b, c, d, x[i + 4], 6, -145523070)

d = ii(d, a, b, c, x[i + 11], 10, -1120210379)

c = ii(c, d, a, b, x[i + 2], 15, 718787259)

b = ii(b, c, d, a, x[i + 9], 21, -343485551)

a = safe_add(a, olda)

b = safe_add(b, oldb)

c = safe_add(c, oldc)

d = safe_add(d, oldd)

}

return [a, b, c, d]

}

/*

* Convert an array of little-endian words to a hex string.

*/

function binl2hex(binarray) {

var hex_tab = "0123456789abcdef"

var str = ""

for (var i = 0; i < binarray.length * 4; i++) {

str += hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8 + 4)) & 0xF) +

hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8)) & 0xF)

}

return str

}

/*

* Convert an array of little-endian words to a base64 encoded string.

*/

function binl2b64(binarray) {

var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"

var str = ""

for (var i = 0; i < binarray.length * 32; i += 6) {

str += tab.charAt(((binarray[i >> 5] << (i % 32)) & 0x3F) |

((binarray[i >> 5 + 1] >> (32 - i % 32)) & 0x3F))

}

return str

}

/*

* Convert an 8-bit character string to a sequence of 16-word blocks, stored

* as an array, and append appropriate padding for MD4/5 calculation.

* If any of the characters are >255, the high byte is silently ignored.

*/

function str2binl(str) {

var nblk = ((str.length + 8) >> 6) + 1 // number of 16-word blocks

var blks = new Array(nblk * 16)

for (var i = 0; i < nblk * 16; i++) blks[i] = 0

for (var i = 0; i < str.length; i++)

blks[i >> 2] |= (str.charCodeAt(i) & 0xFF) << ((i % 4) * 8)

blks[i >> 2] |= 0x80 << ((i % 4) * 8)

blks[nblk * 16 - 2] = str.length * 8

return blks

}

/*

* Convert a wide-character string to a sequence of 16-word blocks, stored as

* an array, and append appropriate padding for MD4/5 calculation.

*/

function strw2binl(str) {

var nblk = ((str.length + 4) >> 5) + 1 // number of 16-word blocks

var blks = new Array(nblk * 16)

for (var i = 0; i < nblk * 16; i++) blks[i] = 0

for (var i = 0; i < str.length; i++)

blks[i >> 1] |= str.charCodeAt(i) << ((i % 2) * 16)

blks[i >> 1] |= 0x80 << ((i % 2) * 16)

blks[nblk * 16 - 2] = str.length * 16

return blks

}

/*

* External interface

*/

function hexMD5(str) { return binl2hex(coreMD5(str2binl(str))) }

function hexMD5w(str) { return binl2hex(coreMD5(strw2binl(str))) }

function b64MD5(str) { return binl2b64(coreMD5(str2binl(str))) }

function b64MD5w(str) { return binl2b64(coreMD5(strw2binl(str))) }

/* Backward compatibility */

function calcMD5(str) { return binl2hex(coreMD5(str2binl(str))) }

module.exports = {

hexMD5: hexMD5

}

/***********************************************************************/

然后在js中引入

至此参数都有了就可以调用：wx.requestPayment

之后就是回调函数；回调方法接收统一下单方法返回的值，可以这样做，在xcxpay方法里是用&链接的，现在用&分割就可以得到想要的数据，再做处理就Ok！

最麻烦的一点就是微信如果收不到返回的通知就会不停的回调，所以在里边一定要加判断

告诉微信你已经接到过通知 返回”success”;至此小程序微信支付就搞定了，现在大家通过学习已经知道要规避哪些问题了吧，也知道具体出错在哪里了吧，那么如果还存在有疑问的，可以留言咨询，或者联系16650234615。