Explication détaillée de la mise en œuvre de la fonction de paiement par code scan WeChat avec PHP

/**
 * 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;
}

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