微信支付PHP开发教程三统一下单实例

class Wxpay{
	const appid='appid';
	const mch_id='商户id';
	const key='商户key';
	
	public function GetSign($params){
		ksort($params);
		$str=urldecode( http_build_query($params)."&key=".self::key);
		return strtoupper(md5($str));
	}
public function Getpayurl(){
		$apiparams=[
		'appid'=>self::appid,
		'mch_id'=>self::mch_id,
		'body'=>'微信支付测试',
		'out_trade_no'=>date('YmdHis'),
		'total_fee'=>1,
		'spbill_create_ip'=>$_SERVER['SERVER_ADDR'],
		'notify_url'=>'http://回调域名/notify.php',
		'trade_type'=>'NATIVE',
		'nonce_str'=>Util::getNonceStr(),
		'attach'=>'微信支付测试',
		'product_id'=>10000
		];
		$apiparams['sign']=$this->GetSign($apiparams);
		
		$xml=Util::ArrToXml($apiparams);
		$result=Util::postXmlCurl($xml,'https://api.mch.weixin.qq.com/pay/unifiedorder');
		$arr=Util::XmlToArr($result);
		if($arr['return_code']=='SUCCESS'){
			return $arr['code_url'];
		}else{
			file_put_contents('./error.txt',$result);
			return false;
		}
	}
}

//工具类
class Util{

/**
* 以post方式提交xml到对应的接口url
* 
* @param WxPayConfigInterface $config 配置对象
* @param string $xml 需要post的xml数据
* @param string $url url
* @param bool $useCert 是否需要证书，默认不需要
* @param int $second url执行超时时间，默认30s
* @throws WxPayException
*/
public static function postXmlCurl($xml, $url, $useCert = false, $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($ch,CURLOPT_SSL_VERIFYHOST,2);//严格校验
//设置header
curl_setopt($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);

if($useCert == true){
//设置证书
//使用证书：cert 与 key 分别属于两个.pem文件
//证书文件请放入服务器的非web目录下
$sslCertPath = './cert/apiclient_cert.pem';
$sslKeyPath = './cert/apiclient_key.pem';
curl_setopt($ch,CURLOPT_SSLCERTTYPE,'PEM');
curl_setopt($ch,CURLOPT_SSLCERT, $sslCertPath);
curl_setopt($ch,CURLOPT_SSLKEYTYPE,'PEM');
curl_setopt($ch,CURLOPT_SSLKEY, $sslKeyPath);
}
//post提交方式
curl_setopt($ch, CURLOPT_POST, TRUE);
curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
//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);

}
}
public static function XmlToArr($xml){
if($xml=='')return '';
libxml_disable_entity_loader(true);
$arr=json_decode(json_encode(simplexml_load_string($xml,'SimpleXMLElement',LIBXML_NOCDATA)),true);
return $arr;
}
public static function ArrToXml($arr){
if(!is_array($arr)||count($arr)==0)return '';
$xml = "<xml>";
foreach ($arr as $key=>$val)
{
if (is_numeric($val)){
$xml.="<".$key.">".$val."</".$key.">";
}else{
$xml.="<".$key."><![CDATA[".$val."]]></".$key.">";
}
}
$xml.="</xml>";
return $xml; 
}
/**
* 
* 产生随机字符串，不长于32位
* @param int $length
* @return 产生的随机字符串
*/
public static function getNonceStr($length = 32) 
{
$chars = "abcdefghijklmnopqrstuvwxyz0123456789"; 
$str ="";
for ( $i = 0; $i < $length; $i++ ) { 
$str .= substr($chars, mt_rand(0, strlen($chars)-1), 1); 
} 
return $str;
}
}

$str=(new Wxpay())->Getpayurl();
echo '<img alt="扫码支付测试" src="https://www.daimadog.com/qrcode.php?cont='.$str.'&rc=L&size=300" style="width:150px;height:150px;"/>';