微信扫码支付相对微信公众号支付来说，开发流程简单很多，不需要网页授权，不要调用微信内置WeixinJSBridge对象。只需要生成二维码，微信扫码即可直接调起微信支付。下面我们来讲解一下微信扫码的开发流程，包括简单的代码测试。
一、前期准备工作
1、申请一个认证服务号，并且开通支付功能
2、备案的域名+服务器（这个是必备的）
二、微信公众号支付开发流程
1、根据微信支付文档封装支付参数，调用微信支付统一下单接口向微信服务器发起请求，返回微信二维码链接。微信文档链接
2、将微信二维码链接生成二维码图片
三、代码开发流程
前面粗略讲解了微信扫码支付的开发流程，理解起来应该是相对简单。下面是示例代码(只是测试代码，不要用于生产环境)：
1、调用微信统一下单接口，获取微信预支付交易会话标识和微信二维码链接。
调用统一下单接口类 wxpay.class.php1
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181<?php
/**
* 微信支付
*/
class WxPay
{
private $apiUrl = 'https://api.mch.weixin.qq.com/pay/unifiedorder';
private $key;
private $mch_id;
private $appid;
private $openid;
private $nonce_str;
private $body;
private $out_trade_no;
private $total_fee;
private $spbill_create_ip;
private $notify_url;
private $trade_type;
function __construct($attributes)
{
$this->key = $attributes['key'];
$this->mch_id = $attributes['mch_id'];
$this->appid = $attributes['appid'];
$this->openid = $attributes['openid'];
$this->body = $attributes['body'];
$this->total_fee = $attributes['total_fee'];
$this->trade_type = $attributes['trade_type'];
$this->notify_url = $attributes['notify_url'];
}
//发送post请求
function http_post($url, $param) {
$header [] = "content-type: application/json; charset=UTF-8";
$ch = curl_init ();
curl_setopt ( $ch, CURLOPT_URL, $url );
curl_setopt ( $ch, CURLOPT_CUSTOMREQUEST, "POST" );
curl_setopt ( $ch, CURLOPT_SSL_VERIFYPEER, FALSE );
curl_setopt ( $ch, CURLOPT_SSL_VERIFYHOST, FALSE );
curl_setopt ( $ch, CURLOPT_HTTPHEADER, $header );
curl_setopt ( $ch, CURLOPT_USERAGENT, 'Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)' );
curl_setopt ( $ch, CURLOPT_FOLLOWLOCATION, 1 );
curl_setopt ( $ch, CURLOPT_AUTOREFERER, 1 );
curl_setopt ( $ch, CURLOPT_POSTFIELDS, $param );
curl_setopt ( $ch, CURLOPT_RETURNTRANSFER, true );
$res = curl_exec ( $ch );
curl_close ( $ch );
//$res = json_decode ( $res, true );
return $res;
}
//数组转换为xml格式
function arrayToXml($arr)
{
$xml = "<xml>";
foreach ($arr as $key=>$val)
{
if (is_numeric($val)){
$xml.="<".$key.">".$val."</".$key.">";
}else{
$xml.="<".$key."><![CDATA[".$val."]]></".$key.">";
}
}
$xml.="</xml>";
return $xml;
}
//将XML转为数组
function xmlToArray($xml)
{
//禁止引用外部xml实体
libxml_disable_entity_loader(true);
$values = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
return $values;
}
//支付参数签名
function paySign($array, $key){
ksort($array);
$str = '';
foreach($array as $k => $value){
$str .= $k.'='.$value.'&';
}
$str .= "key=".$key;
$str = strtoupper(md5($str));
return $str;
}
//生成随机字符串
function get_rand_char($length = 6, $type = 1) {
$str1 = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz";
$str2 = "0123456789";
$strLength1 = 61;
$strLength2 = 9;
$res = '';
if($type == 1){
for($i = 0; $i < $length; $i ++) {
$res .= $str1 [rand ( 0, $strLength1 )];
}
}else{
for($i = 0; $i < $length; $i ++) {
$res .= $str2 [rand ( 0, $strLength2 )];
}
}
return $res;
}
//获取IP
function get_client_ip() {
$ip = $_SERVER['REMOTE_ADDR'];
if (isset($_SERVER['HTTP_CLIENT_IP']) && preg_match('/^([0-9]{1,3}\.){3}[0-9]{1,3}$/', $_SERVER['HTTP_CLIENT_IP'])) {
$ip = $_SERVER['HTTP_CLIENT_IP'];
} elseif(isset($_SERVER['HTTP_X_FORWARDED_FOR']) AND preg_match_all('#\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}#s', $_SERVER['HTTP_X_FORWARDED_FOR'], $matches)) {
foreach ($matches[0] AS $xip) {
if (!preg_match('#^(10|172\.16|192\.168)\.#', $xip)) {
$ip = $xip;
break;
}
}
}
return $ip == '::1' ? '127.0.0.1' : $ip;
}
function prepare(){
$payConfig = [
'mch_id' => $this->mch_id,
'appid' => $this->appid,
'openid' => $this->openid,
'nonce_str' => $this->get_rand_char(32,2),
'body' => $this->body,
'out_trade_no' => date('YmdHis').$this->get_rand_char(6,1),
'total_fee' => $this->total_fee,
'spbill_create_ip' => $this->get_client_ip(),
'notify_url' => $this->notify_url,
'trade_type' => $this->trade_type,
];
$sign = $this->paySign($payConfig, $this->key);
$payConfig['sign'] = $sign;
$payXML = $this->arrayToXml($payConfig);
$result = $this->http_post($this->apiUrl, $payXML);
return $this->xmlToArray($result);
}
function qr_prepare(){
$payConfig = [
'mch_id' => $this->mch_id,
'appid' => $this->appid,
'nonce_str' => $this->get_rand_char(32,2),
'body' => $this->body,
'out_trade_no' => date('YmdHis').$this->get_rand_char(6,1),
'total_fee' => $this->total_fee,
'spbill_create_ip' => $this->get_client_ip(),
'notify_url' => $this->notify_url,
'trade_type' => $this->trade_type,
];
$sign = $this->paySign($payConfig, $this->key);
$payConfig['sign'] = $sign;
$payXML = $this->arrayToXml($payConfig);
$result = $this->http_post($this->apiUrl, $payXML);
return $this->xmlToArray($result);
}
function configForPayment($prepayId){
$jsPayConfig = [
'appId' => $this->appid,
'timeStamp' => strval(time()),
'nonceStr' => $this->get_rand_char(32,2),
'package' => "prepay_id=$prepayId",
'signType' => 'MD5',
];
$jsPayConfig['paySign'] = $this->paySign($jsPayConfig, $this->key);
return json_encode($jsPayConfig);
}
}
测试代码 test.php1
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36<?php
//引入微信支付类
include 'wxpay.class.php';
//APPID
$appid = 'APPID';
//商户号
$mch_id = 'MCH_ID';
//API KEY
$key = 'KEY';
//支付回调地址
$notify_url = 'http://whatcode.cn/notify.php';
//商品描述
$body = '微信测试';
//商品价格
$total_fee = '100';
//微信支付类型
$trade_type = 'NATIVE';
//支付配置参数
$attributes = [
'mch_id' => $mch_id,
'key' => $key,
'appid' => $appid,
'body' => $body,
'total_fee' => $total_fee,
'notify_url' => $notify_url,
'trade_type' => $trade_type,
];
$wxpay = new WxPay($attributes);
$result = $wxpay->qr_prepare();
//打印输出$result
print_r($result);
?>
2、生成微信支付二维码
测试代码：1
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35include 'wxpay.class.php';
//APPID
$appid = 'APPID';
//商户号
$mch_id = 'MCH_ID';
//API KEY
$key = 'KEY';
//支付回调地址
$notify_url = 'http://whatcode.cn/notify.php';
//商品描述
$body = '微信测试';
//商品价格
$total_fee = '1';
//微信支付类型
$trade_type = 'NATIVE';
//支付配置参数
$attributes = [
'mch_id' => $mch_id,
'key' => $key,
'appid' => $appid,
'body' => $body,
'total_fee' => $total_fee,
'notify_url' => $notify_url,
'trade_type' => $trade_type,
];
$wxpay = new WxPay($attributes);
$result = $wxpay->qr_prepare();
if ($result['return_code'] == 'SUCCESS' && $result['result_code'] == 'SUCCESS'){
//利用微信提供的在线生成二维码功能
$wxpay_url = urlencode($result['code_url']);
echo '<img src="http://paysdk.weixin.qq.com/example/qrcode.php?data='.$wxpay_url.'" style="width:150px;height:150px;"/>';
}
这一步的生成二维码图片可以用第三方的类库，github上有很多，这里是为了方便测试就直接用微信提供的测试在线二维码接口。
四、总结
微信扫码支付开发流程相对公众号支付开发少了用户授权登录一步，后台配置了也少了两步，不需要配置授权域名，支付目录。注意支付参数不要弄错，trade_type=NATIVE。
