微信小程序与php 实现微信支付的简单实例

echo json_encode($return);

• 小程序微信支付
  */

class WeixinPay {

protected $appid;
protected $mch_id;
protected $key;
protected $openid;
protected $out_trade_no;
protected $body;
protected $total_fee;
function __construct($appid,$total_fee) {
$this->appid = $appid;
$this->openid = $openid;
$this->mch_id = $mch_id;
$this->key = $key;
$this->out_trade_no = $out_trade_no;
$this->body = $body;
$this->total_fee = $total_fee;
}

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' => 'test',//商品描述
'body' => $this->body,// 'out_trade_no' => '2015450806125348',//商户订单号
'out_trade_no'=> $this->out_trade_no,// 'total_fee' => floatval(0.01 * 100),//总金额 单位 分
'total_fee' => $this->total_fee,// 'spbill_create_ip' => $_SERVER['REMOTE_ADDR'],//终端IP
'spbill_create_ip' => '192.168.0.161',//终端IP
'notify_url' => 'http://www.weixin.qq.com/wxpay/pay.php',//通知地址 确保外网能正常访问
'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 = $this->arrayToXml($parameters);
$return = $this->xmlToArray($this->postXmlCurl($xmlData,$url,60));
return $return;
}

private static function postXmlCurl($xml,$second = 30)
{
$ch = curl_init();
//设置超时
curl_setopt($ch,CURLOPT_TIMEOUT,$second);
curl_setopt($ch,CURLOPT_URL,$url);
curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,FALSE);
curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,FALSE); //严格校验
//设置header
curl_setopt($ch,CURLOPT_HEADER,FALSE);
//要求结果为字符串且输出到屏幕上
curl_setopt($ch,CURLOPT_RETURNTRANSFER,TRUE);
//post提交方式
curl_setopt($ch,CURLOPT_POST,TRUE);
curl_setopt($ch,CURLOPT_POSTFIELDS,$xml);

curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,20); 
curl_setopt($ch,40); 
set_time_limit(0); 


//运行curl 
$data = curl_exec($ch); 
//返回结果 
if ($data) { 
  curl_close($ch); 
  return $data; 
} else { 
  $error = curl_errno($ch); 
  curl_close($ch); 
  throw new WxPayException("curl出错，错误码:$error"); 
} 

}

//数组转换成xml
private function arrayToXml($arr) {
$xml = "";
foreach ($arr as $key => $val) {
if (is_array($val)) {
$xml .= "<" . $key . ">" . arrayToXml($val) . "</" . $key . ">";
} else {
$xml .= "<" . $key . ">" . $val . "</" . $key . ">";
}
}
$xml .= "";
return $xml;
}

//xml转换成数组
private function xmlToArray($xml) {

//禁止引用外部xml实体  


libxml_disable_entity_loader(true); 


$xmlstring = simplexml_load_string($xml,'SimpleXMLElement',LIBXML_NOCDATA); 


$val = json_decode(json_encode($xmlstring),true); 


return $val; 

}

//微信小程序接口
private function weixinapp() {
//统一下单接口
$unifiedorder = $this->unifiedorder();
// print_r($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,strlen($buff) - 1);
}
return $reqPar;
}

}

//禁止引用外部xml实体
libxml_disable_entity_loader(true);

$xmlstring = simplexml_load_string($xml,LIBXML_NOCDATA);

$val = json_decode(json_encode($xmlstring),true);

return $val;
}

$attr = xmlToArray($postXml);

$total_fee = $attr[total_fee];
$open_id = $attr[openid];
$out_trade_no = $attr[out_trade_no];
$time = $attr[time_end];