It’s OK to replace the inside parameters with yours directly, if you want to open the Wechat payment function, you need the merchant number, appid, appsecret, openid.

//Small program end code:

//Backstage

//WeChat paymentPublic function Wx_Pay () {$request=Request:: instance ();$fee=$request-> PAram ('fee');$details=$request-> param ('details'); / / commodity details, such as iPhone8, purple/ / $fee = 0.01; / / example recharge 0.01$appid ='appid'; //appid$body = $details; / / 'GEIL Hui Mall'; / / '[fill it out yourself]$mch_id ='1486742092'; / /] your business number [fill it out].$nonce_str = $this-> nonce_str (); / / random string$notify_url ='https://zys.jinbh.cn/admin/Api/Wx_Speech'; / / callback URL [fill it out];$openid = $request-> param ('openid'); / /] user's openid [oneself fill].$out_trade_no = $thIs-> order_number ($openid); / / merchant order number$spbill_create_ip ='123.206.45.131'; / /' IP of the server [self fill]];$total_fee = $fee * 100; / / / Because the minimum charge is 1 and the unit is 1 yuan, you need * 100 here$trade_type ='JSAPI'/ / transaction type default/ / here is in order, because the following signatures are sorted in order.$post['appid'] = $appid;$post['body'] = $body;$post['mch_id'] = $mch_id;$post['nonce_str'] = $noNce_str; / / random string$post['notify_url'] = $notify_url;$post['openid'] = $Openid;$post['out_trade_no'] = $out_trade_no;$post['spbill_create_ip] = $spbill_create_ip; / / terminal IP$post['total_fee'] = $total_fee; / / the total amount is the lowest, which must be an integer.$post['trade_type'] = $trade_type;$sign = $this-> sign ($post); / / signature$poSt_xml ='< xml>< appid>'.$appid.'< /appid>< body>'.$bodY.'< /body>< mch_id>'.$mch_id.'< /mch_id>< nonce_str> '. $.Nonce_str.'< /nonce_str>< notify_url>'.$notify_url.'< /notify_url>< openid>'.$openid.'< /openid>< out_trade_no>'.$out_trade_no.'< /oUt_trade_no>< spbill_create_ip>'.$spbill_create_ip.'< /spbill_create_ip>< total_fee>'.$total_fee.'< /total_fee>< trade_type>'.$trade_typE.'< /trade_type>< sign>'.$sign.'< /sign>< /xml> ';/ / unified interface prepay_id$url ='https://api.mch.weixin.qq.com/pay/unifiedorder';$xml = $thIs-> http_request ($url, $post_xml);$array = $this-> XML ($xml); / / all must be capitalized.If ($array['RETURN_CODE'] = ='SUCCESS'& & $array['RESULT_CODE'] = ='SUCCESS') {$time = time ();$tmp=''; / / temporary array for signature$tmp['appId'] = $appid;$tmp['nonceStr'] =$nonce_str;$tmp['package'] ='prepay_id='.$array['PREPAY_ID'];$tmp['signTYpe'] ='MD5';$tmp['timeStamp'] = "$time";$data['state'] = 1;$data['timeStamp'] = "$time"; / / timestamp$data['nonceStr'] = $nonce_str; / / random string$Data['signType'] ='MD5'; / / signature algorithm, temporarily support MD5$data['package'] ='prepay_id='.$array['PREPAY_ID'] / / unified prepay_id parameter value returned by the next interface, submit format such as: prepay_id=*$data['paySign'] = $this-> sign ($tmp);/ / signature, the specific signature scheme is referred to the WeChat public number to pay the help document;$data['out_trade_no'] = $out_trade_no;}else{$data['state'] = 0;$data['text'] = "error";$data['RETURN_CODE'] = $array['RETURN_CODE'];$data['RETURN_MSG'] = $array['RETURN_MSG'];}Echo json_eNcode ($data);}/ / random 32 bit stringPrivate function nonce_str () {$result = '';$stR ='QWERTYUIOPASDFGHJKLZXVBNMqwertyuioplkjhgfdsamnbvcxz';For ($i=0; $i< 32; $i++) {$result. = $str[rand (0,48)];}Return $result;}/ / generate order numberPrivate funcTion order_number ($openid) {//date ('Ymd', time ()).Time ().Rand (10,99); //18 bit.Return MD5($openid.time ().Rand (10,99)); //32 bit.}/ / signature $data should be arranged in good order.Public function sign ($data){$stringA = '';Foreach ($data as $key => $value) {If (($value) conti)Nue;If ($stringA) $stringA. ='&; $key. "=". $value;Else $stringA= $key. "=". $value;}$wx_key ='Zhangyusheng19810318015729366660'; / / after application payment, a merchant is granted.Account and password, set up key after landing.StringSignTemp = $stringA.Set up keyReturn strtoupper (MD5 ($stringSignTemp));}//curl request.Function http_requesT ($url, $data = null, $headers = array ()){$curl = curl_init ();If(count ($headers) > = 1) {Curl_setopt ($curl, CURLOPT_HTTPHEADER, $headers);}Curl_setopt ($curl, CURLOPT_URL, $url);Curl_setopt ($curl, CURLOPT_S)SL_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_RETURNTRANS)FER, 1);$output = curl_exec ($curl);Curl_close ($curl);Return $Output;}/ / get XMLPrivate function XML ($xml) {$p = xml_parser_create ();Xml_parse_into_struct ($p, $xml, $vals, $index);Xml_parser_free ($p);$data = "";Foreach ($index as $key=> $value) {If ($key = ='xml')$key (='XML') continue;$tag = $vals[$value[0]]['tag'];$value= $vals[$value[0]]['value'];$data[$tag] = $value;}Return$data;}/ / WeChat payment ended