<?php
//namespace Vendor\Wxpay;
class UnifiedOrder
{	
    
    /**
	 * 	作用：设置请求参数
	 */
	function setParameter($parameter, $parameterValue)
	{
		$this->parameters[$this->trimString($parameter)] = $this->trimString($parameterValue);
	}
	
	/**
	 * 	作用：设置标配的请求参数，生成签名，生成接口参数xml
	 */
	function createXml()
	{
	   	$this->parameters["appid"] = APPID;//公众账号ID
	   	$this->parameters["mch_id"] = MCHID;//商户号
	    $this->parameters["nonce_str"] = $this->createNoncestr();//随机字符串
	    $this->parameters["sign"] = $this->getSign($this->parameters);//签名
	    return  $this->arrayToXml($this->parameters);
	}
	
	/**
	 * 	作用：post请求xml
	 */
	function postXml()
	{
	    $xml = $this->createXml();
        
		$this->response = $this->postXmlCurl($xml,$this->url,$this->curl_timeout);

		return $this->response;
	}
	
	/**
	 * 	作用：使用证书post请求xml
	 */
	function postXmlSSL()
	{
	    $xml = $this->createXml();
		$this->response = $this->postXmlSSLCurl($xml,$this->url,$this->curl_timeout);
		return $this->response;
	}

	/**
	 * 	作用：获取结果，默认不使用证书
	 */
	function getResult() 
	{		
		$this->postXml();
		$this->result = $this->xmlToArray($this->response);
		return $this->result;
	}
    
    
	function trimString($value)
	{
		$ret = null;
		if (null != $value) 
		{
			$ret = $value;
			if (strlen($ret) == 0) 
			{
				$ret = null;
			}
		}
		return $ret;
	}
	
	/**
	 * 	作用：产生随机字符串，不长于32位
	 */
	public function createNoncestr( $length = 32 ) 
	{
		$chars = "abcdefghijklmnopqrstuvwxyz0123456789";  
		$str ="";
		for ( $i = 0; $i < $length; $i++ )  {  
			$str.= substr($chars, mt_rand(0, strlen($chars)-1), 1);  
		}  
		return $str;
	}
	
	/**
	 * 	作用：格式化参数，签名过程需要使用
	 */
	function formatBizQueryParaMap($paraMap, $urlencode)
	{
		$buff = "";
		ksort($paraMap);
		foreach ($paraMap as $k => $v)
		{
		    if($urlencode)
		    {
			   $v = urlencode($v);
			}
			//$buff .= strtolower($k) . "=" . $v . "&";
			$buff .= $k . "=" . $v . "&";
		}
		$reqPar;
		if (strlen($buff) > 0) 
		{
			$reqPar = substr($buff, 0, strlen($buff)-1);
		}
		return $reqPar;
	}
	
	/**
	 * 	作用：生成签名
	 */
	public function getSign($Obj)
	{
		foreach ($Obj as $k => $v)
		{
			$Parameters[$k] = $v;
		}
		//签名步骤一：按字典序排序参数
		ksort($Parameters);
		$String = $this->formatBizQueryParaMap($Parameters, false);
		//echo '【string1】'.$String.'</br>';
		//签名步骤二：在string后加入KEY
		$String = $String."&key=".KEY;
		//echo "【string2】".$String."</br>";
		//签名步骤三：MD5加密
		$String = md5($String);
		//echo "【string3】 ".$String."</br>";
		//签名步骤四：所有字符转为大写
		$result_ = strtoupper($String);
		//echo "【result】 ".$result_."</br>";
		return $result_;
	}
	
	/**
	 * 	作用：array转xml
	 */
	function arrayToXml($arr)
    {
        $xml = "<xml>";
        foreach ($arr as $key=>$val)
        {
        	 if (is_numeric($val))
        	 {
        	 	$xml.="<".$key.">".$val."</".$key.">"; 

        	 }
        	 else
        	 	$xml.="<".$key."><![CDATA[".$val."]]></".$key.">";  
        }
        $xml.="</xml>";
        return $xml; 
    }
	
	/**
	 * 	作用：将xml转为array
	 */
	public function xmlToArray($xml)
	{		
        //将XML转为array        
        $array_data = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);		
		return $array_data;
	}

	/**
	 * 	作用：以post方式提交xml到对应的接口url
	 */
	public function postXmlCurl($xml,$url,$second=30)
	{		
        //初始化curl        
       	$ch = curl_init();
		//设置超时
		curl_setopt($ch, CURLOP_TIMEOUT, $second);
        //这里设置代理，如果有的话
        //curl_setopt($ch,CURLOPT_PROXY, '8.8.8.8');
        //curl_setopt($ch,CURLOPT_PROXYPORT, 8080);
        curl_setopt($ch,CURLOPT_URL, $url);
        curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,FALSE);
        curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,FALSE);
		//设置header
		curl_setopt($ch, CURLOPT_HEADER, FALSE);
		//要求结果为字符串且输出到屏幕上
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
		//post提交方式
		curl_setopt($ch, CURLOPT_POST, TRUE);
		curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
		//运行curl
        $data = curl_exec($ch);
		curl_close($ch);
		//返回结果
		if($data)
		{
			curl_close($ch);
			return $data;
		}
		else 
		{ 
			$error = curl_errno($ch);
			echo "curl出错，错误码:$error"."<br>"; 
			echo "<a href='http://curl.haxx.se/libcurl/c/libcurl-errors.html'>错误原因查询</a></br>";
			curl_close($ch);
			return false;
		}
	}

	/**
	 * 	作用：使用证书，以post方式提交xml到对应的接口url
	 */
	function postXmlSSLCurl($xml,$url,$second=30)
	{
		$ch = curl_init();
		//超时时间
		curl_setopt($ch,CURLOPT_TIMEOUT,$second);
		//这里设置代理，如果有的话
        //curl_setopt($ch,CURLOPT_PROXY, '8.8.8.8');
        //curl_setopt($ch,CURLOPT_PROXYPORT, 8080);
        curl_setopt($ch,CURLOPT_URL, $url);
        curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,FALSE);
        curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,FALSE);
		//设置header
		curl_setopt($ch,CURLOPT_HEADER,FALSE);
		//要求结果为字符串且输出到屏幕上
		curl_setopt($ch,CURLOPT_RETURNTRANSFER,TRUE);
		//设置证书
		//使用证书：cert 与 key 分别属于两个.pem文件
		//默认格式为PEM，可以注释
		curl_setopt($ch,CURLOPT_SSLCERTTYPE,'PEM');
		curl_setopt($ch,CURLOPT_SSLCERT, SSLCERT_PATH);
		//默认格式为PEM，可以注释
		curl_setopt($ch,CURLOPT_SSLKEYTYPE,'PEM');
		curl_setopt($ch,CURLOPT_SSLKEY, SSLKEY_PATH);
		//post提交方式
		curl_setopt($ch,CURLOPT_POST, true);
		curl_setopt($ch,CURLOPT_POSTFIELDS,$xml);
		$data = curl_exec($ch);
		//返回结果
		if($data){
			curl_close($ch);
			return $data;
		}
		else { 
			$error = curl_errno($ch);
			echo "curl出错，错误码:$error"."<br>"; 
			echo "<a href='http://curl.haxx.se/libcurl/c/libcurl-errors.html'>错误原因查询</a></br>";
			curl_close($ch);
			return false;
		}
	}
	
	/**
	 * 	作用：打印数组
	 */
	function printErr($wording='',$err='')
	{
		print_r('<pre>');
		echo $wording."</br>";
		var_dump($err);
		print_r('</pre>');
	}
    
	function __construct() 
	{
		//设置接口链接
		$this->url = "https://api.mch.weixin.qq.com/pay/unifiedorder";
		//设置curl超时时间
		$this->curl_timeout = CURL_TIMEOUT;
	}
	

	
	/**
	 * 获取prepay_id
	 */
	function getPrepayId()
	{
		$this->postXml();
		$this->result = $this->xmlToArray($this->response);
		//dump($this->result);
		$prepay_id = $this->result["prepay_id"];
		return $prepay_id;
	}
	
}


?>