PHP微信支付之扫码支付

在手机微信端进行微信支付，直接调起JSAPI支付，这可以实现在微信里边的开的页面进行支付，比如微商城，微信端JSAPI支付详见：PHP实现微信支付(jsapi支付)和退款(无需集成支付SDK)；但有时候商城还有PC端，需要在PC端使用微信支付，则需要PC端生成支付二维码，然后微信扫码完成支付。例如：
在这里插入图片描述这里主要讲一下PC端扫码支付以及退款的具体实现：

/*** 微信支付请求接口(POST)* @param string $goods_id 	商品ID* @param string $body 		商品简单描述* @param string $order_sn  订单编号* @param string $total_fee 金额* @return  json的数据*/
public function wxpay($goods_id,$total_fee,$body,$order_sn){$config = $this->config;//统一下单参数构造$unifiedorder = array('appid'			=> $config['appid'],'mch_id'		=> $config['mch_id'],'device_info'	=> 'WEB','nonce_str'		=> self::getNonceStr(),'body'			=> $body,'out_trade_no'	=> $order_sn,'total_fee'		=> $total_fee * 100,'spbill_create_ip'	=> self::getip(),'notify_url'	=> 'http://'.$_SERVER['HTTP_HOST'].'/notify.php','trade_type'	=> 'NATIVE','product_id'	=> $goods_id);$unifiedorder['sign'] = self::makeSign($unifiedorder);//return $unifiedorder;//请求数据,统一下单$xmldata = self::array2xml($unifiedorder);$url = 'https://api.mch.weixin.qq.com/pay/unifiedorder';$res = self::curl_post_ssl($url, $xmldata);if(!$res){return array('status'=>0, 'msg'=>"Can't connect the server" );}// 这句file_put_contents是用来查看服务器返回的结果 测试完可以删除了file_put_contents('./log.txt',$res,FILE_APPEND);$content = self::xml2array($res);if(strval($content['result_code']) == 'FAIL'){return array('status'=>0, 'msg'=>strval($content['err_code']).':'.strval($content['err_code_des']));}if(strval($content['return_code']) == 'FAIL'){return array('status'=>0, 'msg'=>strval($content['return_msg']));}return $content;
}/*** 微信退款(POST)* @param string(28) $transaction_id 	在微信支付的时候,微信服务器生成的订单流水号,在支付通知中有返回* @param string $out_refund_no 		商品简单描述* @param string $total_fee 			微信支付的时候支付的总金额(单位:分)* @param string $refund_fee 			此次要退款金额(单位:分)* @return string						xml格式的数据*/
public function refund($transaction_id,$out_refund_no,$total_fee,$refund_fee){$config = $this->config;//退款参数$refundorder = array('appid'			=> $config['appid'],'mch_id'		=> $config['mch_id'],'nonce_str'		=> self::getNonceStr(),'transaction_id'=> $transaction_id,'out_refund_no'	=> $out_refund_no,'total_fee'		=> $total_fee * 100,'refund_fee'	=> $refund_fee * 100);$refundorder['sign'] = self::makeSign($refundorder);//请求数据,进行退款$xmldata = self::array2xml($refundorder);$url = 'https://api.mch.weixin.qq.com/secapi/pay/refund';$res = self::curl_post_ssl($url, $xmldata);if(!$res){return array('status'=>0, 'msg'=>"Can't connect the server" );}// 这句file_put_contents是用来查看服务器返回的结果 测试完可以删除了//file_put_contents('./log3.txt',$res,FILE_APPEND);$content = self::xml2array($res);if(strval($content['result_code']) == 'FAIL'){return array('status'=>0, 'msg'=>strval($content['err_code']).':'.strval($content['err_code_des']));}if(strval($content['return_code']) == 'FAIL'){return array('status'=>0, 'msg'=>strval($content['return_msg']));}return $content;
}

支付和退款就是这么简单，而且支付的时候无需获取用户openid，无需证书文件，无需配置支付授权目录，这是封装过的支付类文件的实现，调用方法更简单：

require_once "webwxpay.class.php";$config = array('appid'			=> 'wx123456789876','mch_id'	 	=> '123456789','pay_apikey' 	=> '123456789876123456789876123456789876'
);$wxpay = new WxPay($config);
$result = $wxpay->paytest();
//print_r($result);
scerweima($result['code_url']);		//生成的支付二维码,用户可以扫码付款