PHP微信小程序支付统一下单接口配置

项目：开发了微信小程序，后台需要用到微信支付统一下单接口

1、微信商户平台APPID绑定授权申请

2、开通app支付，不行的话把其他支付也开通

3、在账户设置===》API安全===》设置api密钥

以上三步获取到：小程序appid，商户号和key

4、随机字符串（nonce_str），$length=32

public static function randomStr($length=32) {
        $str = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
        $len = 62;
        while($length > $len) {
            $str .= $str;
            $len += 62;
        }
        $str = str_shuffle($str);
        return substr($str, 0, $length);
}

5、签名算法,参数是统一下单接口的数组形式参数

public function getSign($urlObj='')
    {
    	$buff = "";
    	ksort($urlObj);
		foreach ($urlObj as $k => $v)
		{
			if($k != "sign"){
				$buff .= $k . "=" . $v . "&";
			}
		}

		$buff = trim($buff, "&");
		$key=\Yii::$app->params['payment.weixin.appkey'];
		$buff = $buff.'&key='.$key;
		$buff = strtoupper(md5($buff));
		return $buff;
    }

6、数组转化xml

public function ToXml($data)
	{
		if(!is_array($data) || count($data) <= 0)
		{
    		throw new WxPayException("数组数据异常！");
    	}

    	$xml = "<xml>";
    	foreach ($data as $key=>$val)
    	{
    		if (is_numeric($val)){
    			$xml.="<".$key.">".$val."</".$key.">";
    		}else{
    			$xml.="<".$key."><![CDATA[".$val."]]></".$key.">";
    		}
        }
        $xml.="</xml>";
        return $xml; 
	}

7、调用统一下单接口，$wxurl是统一下单接口， $data是第六步转化后的xml参数

/*小程序统一下单接口调用*/
    public function getUrlInfo($wxurl,$data){
        $headerArray =array("Content-type:application/json;charset='utf-8'","Accept:application/json");
        $curl = curl_init();
        curl_setopt($curl, CURLOPT_URL, $wxurl);
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST,FALSE);
        curl_setopt($curl, CURLOPT_POST, 1);
        curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
        curl_setopt($curl,CURLOPT_HTTPHEADER,$headerArray);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
        $output = curl_exec($curl);
        curl_close($curl);
        return $output;
    }

8、调用接口后返回xml转数组

/**
     * 将xml转为array
     * @param string $xml
     * @throws WxPayException
     */
	public function FromXml($xml)
	{
		if(!$xml){
			throw new WxPayException("xml数据异常！");
		}
        //将XML转为array
        //禁止引用外部xml实体
        libxml_disable_entity_loader(true);
        $arr = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
		return $arr;
	}

9、保存返回数据

PHP微信小程序支付统一下单接口配置

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