PHP微信开发之二维码生成类

<?php
/**
 * created by phpstorm.
 * user: bin
 * date: 15-1-16
 * time: 上午9:48
 */
namespace home\common;

// 微信处理类
set_time_limit(30);
class weixin{
  //构造方法
  static $qrcode_url = "https://api.weixin.qq.com/cgi-bin/qrcode/create?";
  static $token_url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&";
  static $qrcode_get_url = "https://mp.weixin.qq.com/cgi-bin/showqrcode?";

  //生成二维码
  public function getewm($wechatid,$fqid,$type = 1){
    $wechat = m('member_public')->where(array('id'=> $wechatid))->find();
    $appid = $wechat['appid'];
    $secret = $wechat['secret'];
    $access_token = $this->gettoken($appid,$secret);
    $url = $this->getqrcodeurl($access_token,$fqid,1);
    return downloadqr($url,time());
  }
  protected function getqrcodeurl($access_token,$fqid,$type = 1){
    $url = self::$qrcode_url.'access_token='.$access_token;
    if($type == 1){
      //生成永久二维码
      $qrcode= '{"action_name": "qr_limit_scene", "action_info": {"scene": {"scene_id": '.$fqid.'}}}';
    }else{
      //生成临时二维码
      $qrcode = '{"expire_seconds": 1800, "action_name": "qr_scene", "action_info": {"scene": {"scene_id": '.$fqid.'}}}';
    }
    $result = $this->http_post_data($url,$qrcode);
    $oo = json_decode($result[1]);
    if(!$oo->ticket){
      $this->errorlogger('getqrcodeurl falied. error info: getqrcodeurl get failed');
      exit();
    }
    $url = self::$qrcode_get_url.'ticket='.$oo->ticket.'';
    return $url;

  }

  protected function gettoken($appid,$secret){
    $access_token = file_get_contents(self::$token_url."appid=$appid&secret=$secret");
    $access_token = json_decode($access_token);
    $access_token = $access_token->access_token;
    return $access_token;
  }
  protected function http_post_data($url, $data_string) {

    $ch = curl_init();
    curl_setopt($ch, curlopt_post, 1);
    curl_setopt($ch, curlopt_url, $url);
    curl_setopt($ch, curlopt_postfields, $data_string);
    curl_setopt($ch, curlopt_httpheader, array(
        'content-type: application/json; charset=utf-8',
        'content-length: ' . strlen($data_string))
    );
    ob_start();
    curl_exec($ch);
    if (curl_errno($ch)) {
      $this->errorlogger('curl falied. error info: '.curl_error($ch));
    }
    $return_content = ob_get_contents();
    ob_end_clean();
    $return_code = curl_getinfo($ch, curlinfo_http_code);
    return array($return_code, $return_content);
  }
  //下载二维码到服务器
  protected function downloadqr($url,$filestring){
    if($url == ""){
      return false;
    }
    $filename = $filestring.'.jpg';
    ob_start();
    readfile($url);
    $img=ob_get_contents();
    ob_end_clean();
    $size=strlen($img);
    $fp2=fopen('./uploads/qrcode/'.$filename,"a");
    if(fwrite($fp2,$img) === false){
      $this->errorlogger('dolwload image falied. error info: 无法写入图片');
      exit();
    }
    fclose($fp2);
    return './uploads/qrcode/'.$filename;
  }

  private function errorlogger($errmsg){
    $logger = fopen('./errorlog.txt', 'a+');
    fwrite($logger, date('y-m-d h:i:s')." error info : ".$errmsg."\r\n");
  }

}