原创：微信小程序调用【统一下单】、【支付】、【支付回调】api并处理请求...

/* 首先在服务器端调用微信【统一下单】接口&＃xff0c;返回prepay_id和sign签名等信息给前端&＃xff0c;前端调用微信支付接口 */private function Pay($total_fee,$openid,$order_id){if(empty($total_fee)){echo json_encode(array(&＃39;state&＃39;&＃61;>0,&＃39;Msg&＃39;&＃61;>&＃39;金额有误&＃39;));exit;}if(empty($openid)){echo json_encode(array(&＃39;state&＃39;&＃61;>0,&＃39;Msg&＃39;&＃61;>&＃39;登录失效&＃xff0c;请重新登录(openid参数有误)&＃39;));exit;}if(empty($order_id)){echo json_encode(array(&＃39;state&＃39;&＃61;>0,&＃39;Msg&＃39;&＃61;>&＃39;自定义订单有误&＃39;));exit;}$appid &＃61; &＃39;小程序appid&＃39;;//如果是公众号 就是公众号的appid;小程序就是小程序的appid$body &＃61; &＃39;自己填&＃39;;$mch_id &＃61; &＃39;商户账号&＃39;;$KEY &＃61; &＃39;你申请微信支付的key&＃39;;$nonce_str &＃61; randomkeys(32);//随机字符串$notify_url &＃61; &＃39;https://m.******.com/index.php/Home/Xiaoxxf/xiao_notify_url&＃39;; //支付完成回调地址url,不能带参数$out_trade_no &＃61; $order_id;//商户订单号$spbill_create_ip &＃61; $_SERVER[&＃39;SERVER_ADDR&＃39;];$trade_type &＃61; &＃39;JSAPI&＃39;;//交易类型 默认JSAPI//这里是按照顺序的 因为下面的签名是按照(字典序)顺序 排序错误 肯定出错$post[&＃39;appid&＃39;] &＃61; $appid;$post[&＃39;body&＃39;] &＃61; $body;$post[&＃39;mch_id&＃39;] &＃61; $mch_id;$post[&＃39;nonce_str&＃39;] &＃61; $nonce_str;//随机字符串$post[&＃39;notify_url&＃39;] &＃61; $notify_url;$post[&＃39;openid&＃39;] &＃61; $openid;$post[&＃39;out_trade_no&＃39;] &＃61; $out_trade_no;$post[&＃39;spbill_create_ip&＃39;] &＃61; $spbill_create_ip;//服务器终端的ip$post[&＃39;total_fee&＃39;] &＃61; intval($total_fee); //总金额 最低为一分钱 必须是整数$post[&＃39;trade_type&＃39;] &＃61; $trade_type;$sign &＃61; $this->MakeSign($post,$KEY); //签名$this->sign &＃61; $sign;$post_xml &＃61; &＃39;&＃39;.$appid.&＃39;&＃39;.$body.&＃39;&＃39;.$mch_id.&＃39;&＃39;.$nonce_str.&＃39;&＃39;.$notify_url.&＃39;&＃39;.$openid.&＃39;&＃39;.$out_trade_no.&＃39;&＃39;.$spbill_create_ip.&＃39;&＃39;.$total_fee.&＃39;&＃39;.$trade_type.&＃39;&＃39;.$sign.&＃39; &＃39;;//统一下单接口prepay_id$url &＃61; &＃39;https://api.mch.weixin.qq.com/pay/unifiedorder&＃39;;$xml &＃61; $this->http_request($url,$post_xml); //POST方式请求http$array &＃61; $this->xml2array($xml); //将【统一下单】api返回xml数据转换成数组&＃xff0c;全要大写if($array[&＃39;RETURN_CODE&＃39;] &＃61;&＃61; &＃39;SUCCESS&＃39; && $array[&＃39;RESULT_CODE&＃39;] &＃61;&＃61; &＃39;SUCCESS&＃39;){$time &＃61; time();$tmp&＃61;&＃39;&＃39;; //临时数组用于签名$tmp[&＃39;appId&＃39;] &＃61; $appid;$tmp[&＃39;nonceStr&＃39;] &＃61; $nonce_str;$tmp[&＃39;package&＃39;] &＃61; &＃39;prepay_id&＃61;&＃39;.$array[&＃39;PREPAY_ID&＃39;];$tmp[&＃39;signType&＃39;] &＃61; &＃39;MD5&＃39;;$tmp[&＃39;timeStamp&＃39;] &＃61; "$time";$data[&＃39;state&＃39;] &＃61; 1;$data[&＃39;timeStamp&＃39;] &＃61; "$time"; //时间戳$data[&＃39;nonceStr&＃39;] &＃61; $nonce_str; //随机字符串$data[&＃39;signType&＃39;] &＃61; &＃39;MD5&＃39;; //签名算法&＃xff0c;暂支持 MD5$data[&＃39;package&＃39;] &＃61; &＃39;prepay_id&＃61;&＃39;.$array[&＃39;PREPAY_ID&＃39;]; //统一下单接口返回的 prepay_id 参数值&＃xff0c;提交格式如&＃xff1a;prepay_id&＃61;*$data[&＃39;paySign&＃39;] &＃61; $this->MakeSign($tmp,$KEY); //签名,具体签名方案参见微信公众号支付帮助文档;$data[&＃39;out_trade_no&＃39;] &＃61; $out_trade_no;}else{$data[&＃39;state&＃39;] &＃61; 0;$data[&＃39;text&＃39;] &＃61; "错误";$data[&＃39;RETURN_CODE&＃39;] &＃61; $array[&＃39;RETURN_CODE&＃39;];$data[&＃39;RETURN_MSG&＃39;] &＃61; $array[&＃39;RETURN_MSG&＃39;];}echo json_encode($data);}/*** 生成签名, $KEY就是支付key* &＃64;return 签名*/public function MakeSign( $params,$KEY){//签名步骤一&＃xff1a;按字典序排序数组参数ksort($params);$string &＃61; $this->ToUrlParams($params); //参数进行拼接key&＃61;value&k&＃61;v//签名步骤二&＃xff1a;在string后加入KEY$string &＃61; $string . "&key&＃61;".$KEY;//签名步骤三&＃xff1a;MD5加密$string &＃61; md5($string);//签名步骤四&＃xff1a;所有字符转为大写$result &＃61; strtoupper($string);return $result;}/*** 将参数拼接为url: key&＃61;value&key&＃61;value* &＃64;param $params* &＃64;return string*/public function ToUrlParams( $params ){$string &＃61; &＃39;&＃39;;if( !empty($params) ){$array &＃61; array();foreach( $params as $key &＃61;> $value ){$array[] &＃61; $key.&＃39;&＃61;&＃39;.$value;}$string &＃61; implode("&",$array);}return $string;}/*** 调用接口&＃xff0c; $data是数组参数* &＃64;return 签名*/public function http_request($url,$data &＃61; null,$headers&＃61;array()){$curl &＃61; curl_init();if( count($headers) >&＃61; 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);$output &＃61; curl_exec($curl);curl_close($curl);return $output;}//获取xml里面数据&＃xff0c;转换成arrayprivate function xml2array($xml){$p &＃61; xml_parser_create();xml_parse_into_struct($p, $xml, $vals, $index);xml_parser_free($p);$data &＃61; "";foreach ($index as $key&＃61;>$value) {if($key &＃61;&＃61; &＃39;xml&＃39; || $key &＃61;&＃61; &＃39;XML&＃39;) continue;$tag &＃61; $vals[$value[0]][&＃39;tag&＃39;];$value &＃61; $vals[$value[0]][&＃39;value&＃39;];$data[$tag] &＃61; $value;}return $data;}

/*** 将xml转为array* &＃64;param string $xml* return array*/public function xml_to_array($xml){if(!$xml){return false;}//将XML转为array//禁止引用外部xml实体libxml_disable_entity_loader(true);$data &＃61; json_decode(json_encode(simplexml_load_string($xml, &＃39;SimpleXMLElement&＃39;, LIBXML_NOCDATA)), true);return $data;}

/* 微信支付完成&＃xff0c;回调地址url方法 xiao_notify_url() */public function xiao_notify_url(){$post &＃61; post_data(); //接受POST数据XML个数
/*

function post_data(){
$receipt &＃61; $_REQUEST;
if($receipt&＃61;&＃61;null){
$receipt &＃61; file_get_contents("php://input");
if($receipt &＃61;&＃61; null){
$receipt &＃61; $GLOBALS[&＃39;HTTP_RAW_POST_DATA&＃39;];
}
}
return $receipt;
}

*/
$post_data &＃61; $this->xml_to_array($post); //微信支付成功&＃xff0c;返回回调地址url的数据&＃xff1a;XML转数组Array$postSign &＃61; $post_data[&＃39;sign&＃39;];unset($post_data[&＃39;sign&＃39;]);/* 微信官方提醒&＃xff1a;* 商户系统对于支付结果通知的内容一定要做【签名验证】,* 并校验返回的【订单金额是否与商户侧的订单金额】一致&＃xff0c;* 防止数据泄漏导致出现“假通知”&＃xff0c;造成资金损失。*/ksort($post_data);// 对数据进行排序$str &＃61; $this->ToUrlParams($post_data);//对数组数据拼接成key&＃61;value字符串$user_sign &＃61; strtoupper(md5($post_data)); //再次生成签名&＃xff0c;与$postSign比较$where[&＃39;crsNo&＃39;] &＃61; $post_data[&＃39;out_trade_no&＃39;];$order_status &＃61; M(&＃39;home_order&＃39;,&＃39;xxf_witkey_&＃39;)->where($where)->find();if($post_data[&＃39;return_code&＃39;]&＃61;&＃61;&＃39;SUCCESS&＃39;&&$postSign){/** 首先判断&＃xff0c;订单是否已经更新为ok&＃xff0c;因为微信会总共发送8次回调确认* 其次&＃xff0c;订单已经为ok的&＃xff0c;直接返回SUCCESS* 最后&＃xff0c;订单没有为ok的&＃xff0c;更新状态为ok&＃xff0c;返回SUCCESS*/if($order_status[&＃39;order_status&＃39;]&＃61;&＃61;&＃39;ok&＃39;){$this->return_success();}else{$updata[&＃39;order_status&＃39;] &＃61; &＃39;ok&＃39;;if(M(&＃39;home_order&＃39;,&＃39;xxf_witkey_&＃39;)->where($where)->save($updata)){$this->return_success();}}}else{echo &＃39;微信支付失败&＃39;;}}/** 给微信发送确认订单金额和签名正确&＃xff0c;SUCCESS信息 -xzz0521*/private function return_success(){$return[&＃39;return_code&＃39;] &＃61; &＃39;SUCCESS&＃39;;$return[&＃39;return_msg&＃39;] &＃61; &＃39;OK&＃39;;$xml_post &＃61; &＃39;&＃39;.$return[&＃39;return_code&＃39;].&＃39;&＃39;.$return[&＃39;return_msg&＃39;].&＃39;&＃39;;echo $xml_post;exit;}