PHP微信支付結(jié)果通知與回調(diào)策略分析

$str='xml>return_code>![CDATA[SUCCESS]]>/return_code>return_msg>![CDATA[OK]]>/return_msg>/xml>';
exit($str);

//微信支付回調(diào)
public function order_notice(){
    $xml = $GLOBALS['HTTP_RAW_POST_DATA'];
    //將服務(wù)器返回的XML數(shù)據(jù)轉(zhuǎn)化為數(shù)組
    $data = $this->FromXml($xml);
    // 保存微信服務(wù)器返回的簽名sign
    $data_sign = $data['sign'];
    // sign不參與簽名算法
    unset($data['sign']);
    //$sign = self::makeSign($data);
    $sign = $this->makeSign($data);
    Clog::setLog($data,'order_notice');
    // 判斷簽名是否正確 判斷支付狀態(tài)
    if ( ($sign===$data_sign)  ($data['return_code']=='SUCCESS')  ($data['result_code']=='SUCCESS') ) {
      //獲取服務(wù)器返回的數(shù)據(jù)
      $order_num = $data['out_trade_no'];     //訂單單號
      $openid = $data['openid'];         //付款人openID
      $total_fee = $data['total_fee'];      //付款金額
      $transaction_id = $data['transaction_id']; //微信支付流水號
      $res = $this->order_notice_data_deal($order_num,$openid,$total_fee,$transaction_id);
      if (!$res) {
        $result = -2;
      } else {
        $result = 0;
      }
    }else{
      $result = -1;
    }
    // 返回狀態(tài)給微信服務(wù)器
    if ($result == 0) { // 成功之后不會再回調(diào)
      $str='xml>return_code>![CDATA[SUCCESS]]>/return_code>return_msg>![CDATA[OK]]>/return_msg>/xml>';
    } elseif ($result == -1){ // 失敗后會繼續(xù)發(fā)送幾次回調(diào)
      $str='xml>return_code>![CDATA[FAIL]]>/return_code>return_msg>![CDATA[簽名失敗]]>/return_msg>/xml>';
    } elseif ($result == -2) { // 失敗后會繼續(xù)發(fā)送幾次回調(diào)
      $str='xml>return_code>![CDATA[FAIL]]>/return_code>return_msg>![CDATA[更改狀態(tài)失敗]]>/return_msg>/xml>';
    }
    Clog::setLog($result,'order_notice_result');
    exit($str);
}

public function ToXml($array){
    if(!is_array($array)|| count($array) = 0){
      return ;
    }
    $xml = 'xml version="1.0">';
    foreach ($array as $key=>$val){
      if (is_numeric($val)){
        $xml.="".$key.">".$val."/".$key.">";
      }else{
        $xml.="".$key.">![CDATA[".$val."]]>/".$key.">";
      }
    }
    $xml.="/xml>";
    return $xml;
}
public function FromXml($xml){
    if(!$xml){
      // 人工拋出錯誤
      throw new Exception("xml數(shù)據(jù)異常！");
    }
    //將XML轉(zhuǎn)為array
    //禁止引用外部xml實體
    libxml_disable_entity_loader(true);
    $this->values = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
    return $this->values;
}
public function MakeSign($data)
{
    //簽名步驟一：按字典序排序參數(shù)
    ksort($data);
    $string = $this->ToUrlParams($data);
    //簽名步驟二：在string后加入KEY
    $string = $string . "key=".C('WEIXIN_PAY_KEY');
    //簽名步驟三：MD5加密
    $string = md5($string);
    //簽名步驟四：所有字符轉(zhuǎn)為大寫
    $result = strtoupper($string);
    return $result;
}
public function ToUrlParams($array)
{
    $buff = "";
    foreach ($array as $k => $v)
    {
      if($k != "sign"  $v != ""  !is_array($v)){
        $buff .= $k . "=" . $v . "";
      }
    }
    $buff = trim($buff, "");
    return $buff;
}
// createNonceStr
public function createNonceStr($length = 16) {
    $chars = "abcdefghijklmnopqrstuvwxyz0123456789";
    $str ="";
    for ( $i = 0; $i  $length; $i++ ) {
      $str .= substr($chars, mt_rand(0, strlen($chars)-1), 1);
    }
    return $str;
}