<!--"/api/wechat/cert/apiclient_cert.pem";
 /**
  * 私钥
  */
 private $private_key = '/api/wechat/cert/apiclient_key.pem';
 /**
  * ca证书
  */
 private $rootca = 'api/wechat/cert/rootca.pem';
 public function __construct()
 {
  //初始化红包设置信息
  $this--->weixin_appid = C('wap_weixin_appid');
  $this->mch_id = C('wechat_mch_id');
  $this->send_name = C('wechat_send_name');
  $this->wishing = C('wechat_wishing');
  $this->act_name = C('wechat_act_name');
  $this->client_ip = $_SERVER['SERVER_ADDR'];
  $this->remark = C('wechat_remark');
  $this->nonce_str = $this->create_nonce_str(32);
  $this->api_password = C('wechat_api_password');
  $inc_file = BASE_PATH.DS.'api'.DS.'wechat'.DS.'arraytoxml.php';
  if(is_file($inc_file)) {
   require($inc_file);
  }
  $this->arraytoxml = new ArrayToXML();
 }
 
 public function send_post($mch_billno,$re_openid,$total_amount){
  $sign = $this->create_sign($mch_billno,$re_openid,$total_amount);
  $send_array = array(
   'nonce_str' => $this->nonce_str,
   'mch_billno' => $mch_billno,
   'mch_id' => $this->mch_id,
   'wxappid' => $this->weixin_appid,
   'send_name' => $this->send_name,
   're_openid' => $re_openid,
   'total_amount' => $total_amount,
   'total_num' => $this->total_num,
   'wishing' => $this->wishing,
   'client_ip' => $this->client_ip,
   'act_name' => $this->act_name,
   'remark' => $this->remark,
   'sign' => $sign,
  );
  $send_xml = $this->arraytoxml->toXml($send_array,'');
  $data = $this->curl_post_ssl($this->url, $send_xml);
  $data = $this->xmlToArray($data);
  file_put_contents('adki',var_export($data,true),FILE_APPEND);
 }
 /*
 请确保您的libcurl版本是否支持双向认证，版本高于7.20.1
 */
 private function curl_post_ssl($url, $vars, $second=30,$aHeader=array()){
  $ch = curl_init();
  //超时时间
  curl_setopt($ch,CURLOPT_TIMEOUT,$second);
  curl_setopt($ch,CURLOPT_RETURNTRANSFER, 1);
  //这里设置代理，如果有的话
  //curl_setopt($ch,CURLOPT_PROXY, '10.206.30.98');
  //curl_setopt($ch,CURLOPT_PROXYPORT, 8080);
  curl_setopt($ch,CURLOPT_URL,$url);
  curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,false);
  curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,false);
  //以下两种方式需选择一种
  //第一种方法，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,getcwd().$this->public_key);
  //默认格式为PEM，可以注释
  curl_setopt($ch,CURLOPT_SSLKEYTYPE,'PEM');
  curl_setopt($ch,CURLOPT_SSLKEY,getcwd().$this->private_key);
  //ca证书
  curl_setopt($ch,CURLOPT_CAINFO,$this->rootca);
  //第二种方式，两个文件合成一个.pem文件
  //curl_setopt($ch,CURLOPT_SSLCERT,getcwd().'/all.pem');
  if( count($aHeader) >= 1 ){
   curl_setopt($ch, CURLOPT_HTTPHEADER, $aHeader);
  }
  curl_setopt($ch,CURLOPT_POST, 1);
  curl_setopt($ch,CURLOPT_POSTFIELDS,$vars);
  $data = curl_exec($ch);
  if($data){
   curl_close($ch);
   return $data;
  }
  else {
   $error = curl_errno($ch);
   echo "call faild, errorCode:$error\n\n\n\n";
   curl_close($ch);
   return false;
  }
 }
 //生成签名
 private function create_sign($mch_billno,$re_openid,$total_amount){
  $string_array = array(
   'act_name' => $this->act_name,
   'client_ip' => $this->client_ip,
   'mch_billno' => $mch_billno,
   'mch_id' => $this->mch_id,
   'nonce_str' => $this->nonce_str,
   're_openid' => $re_openid,
   'remark' => $this->remark,
   'send_name' => $this->send_name,
   'total_amount' => $total_amount,
   'total_num' => $this->total_num,
   'wishing' => $this->wishing,
   'wxappid' => $this->weixin_appid,
  );
  foreach ($string_array as $key => $value){

   if(!empty($value)){

    $stringA .= "$key=$value";
    if($key != 'wxappid'){

     $stringA .= '&';
    }
   }
  }
  //转成UTF-8
  $stringA = $this->gbkToUtf8($stringA);
  $stringSignTemp="$stringA&key=$this->api_password";
  $sign = MD5($stringSignTemp);

  $sign = strtoupper($sign);
  return $sign;
 }
 //生成随机字符串
 private function create_nonce_str($length){
  $str = null;
  $strPol = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz";
  $max = strlen($strPol)-1;
  for($i=0;$i<$length;$i++){
   $str.=$strPol[rand(0,$max)];//rand($min,$max)生成介于min和max两个数之间的一个随机整数
  }

  return $str;
 }
 /**
  *自动判断把gbk或gb2312编码的字符串转为utf8
  *能自动判断输入字符串的编码类，如果本身是utf-8就不用转换，否则就转换为utf-8的字符串
  *支持的字符编码类型是：utf-8,gbk,gb2312
  *@$str:string 字符串
  */
 private function gbkToUtf8($str){
  $charset = mb_detect_encoding($str,array('ASCII','UTF-8','GBK','GB2312'));
  $charset = strtolower($charset);
  if("utf-8" != $charset){
   $str = iconv('UTF-8',$charset,$str);
  }
  return $str;

 }
 private function xmlToArray($postStr){
  $msg = array();
  $msg = (array)simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
  return $msg;
 }
}

<!--"<".$key.">".$value."<!--".$key."-->";
   }else{
    $xml .= "<".$key."><!--[CDATA[".$value."]]--><!--".$key."-->";
   }
  }
  $xml .= '';
  return $xml;
 }

}