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    /**
    * Éu³ÉËoÂÔͼ
    * @param  $path ԭͼµÄ±¾µØÂ*¾¶
    * @return null ´´½¨Ò»¸o ԭͼ_thumb.À(C)Õ¹Ãu µÄÎļþ
    *
    */
    public function dealthumb($path){
        $config['image_library'] = 'gd2';
        $config['source_image'] = $path;
        $config['create_thumb'] = TRUE;
        //Éu³ÉµÄËoÂÔͼ½«ÔÚ±£³Ö×ݺa±ÈÀý ÔÚ¿i¶ÈºÍ¸ß¶ÈÉϽӽuËuÉe¶¨µÄwidthºÍheight
        $config['maintain_ratio'] = TRUE;
        $config['width'] = 80;
        $config['height'] = 80;
        $this->load->library('image_lib', $config);
        $this->image_lib->resize();
        $this->image_lib->clear();
    }
    /*
    * ´¦ÀiͼÏñÐýת
    */
    public function transroate($path,$imgpath){
        $this->load->library('image_lib');
        //(±ØÐe)ÉeÖÃͼÏñ¿a
        $config['image_library'] = 'gd2';
        $newname = time().'_rote.jpg';
        //ÉeÖÃͼÏñµÄÄ¿±eÃu/Â*¾¶
        $config['new_image'] =$imgpath.$newname;
        //(±ØÐe)ÉeÖÃԭʼͼÏñµÄÃu×Ö/Â*¾¶
        $config['source_image'] = $path;
        //¾o¶¨ÐÂͼÏñµÄÉu³ÉÊÇҪдÈeÓ²ÅÌ»¹ÊǶ¯Ì¬µÄ´aeÔÚ
        $config['dynamic_output'] = FALSE;
        //ÉeÖÃͼÏñµÄÆ*ÖÊ¡£Æ*ÖÊÔ½¸ß£¬Í¼ÏñÎļþÔ½´o
        $config['quality'] = '90%';
        //ÓÐ5¸oÐýתѡÏi ÄaeʱÕe90 180 270 ¶È vrt ÊuÏo*­×ª hor ºaÏo*­×ª
        $config['rotation_angle'] = 'vrt';
        $this->image_lib->initialize($config);
        if(@$this->image_lib->rotate()){
          $this->image_lib->clear();
          return $config['new_image'];
        }else{
          $this->image_lib->clear();
          return '';
        }
    }
    /**
    * ´¦ÀiͼÏñˮӡ
    */
    public function overlay($path,$imgpath){
        $this->load->library('image_lib');
        $newname = time().'_over.jpg';
        //ÉeÖÃÐÂͼÏñÃu³Æ
        $config['new_image'] =$imgpath.$newname;
        //µ÷ÓÃphp gd¿a »aeͼ
        $config['image_library'] = 'gd2';
        //ԴͼÏñ ±¾µØµØÖ*
        $config['source_image'] = $path;
        //¸²¸ÇÎÄ×Ö
        $config['wm_text'] = 'Copyright 2015 - Friker';
        //¸²¸ÇÀaÐÍ ÎÄ×Ö/ͼÏñ
        $config['wm_type'] = 'text';
        //ÎÄ×Ö×ÖÌaÀaÐÍ
        //$config['wm_font_path'] = 'C:\Windows\Fonts\vrinda.ttf';
        //×ÖÌa´oС
        $config['wm_font_size'] = '16';
        //×ÖÌaÑÕÉ«
        $config['wm_font_color'] = 'ff0000';
        //´¹Ö±*½Ïo¾aÀe¶¥¶Ë¾aÀe
        $config['wm_vrt_alignment'] = '20';
        //ˮƽ*½Ïo¾aÀe×o¶Ë¾aÀe
        $config['wm_hor_alignment'] = 'center';
        //padding
        $config['wm_padding'] = '20';
        $this->image_lib->initialize($config);
        if($this->image_lib->watermark()){
          $this->image_lib->clear();
          return $config['new_image'];
        }else{
          $this->image_lib->clear();
          return '';
        }
    }
    /**
    *  ´¦ÀiͼƬÉÏ´«
    *  ÎļþÉÏ´«Àa ͨ¹ýǰ̨ ÉÏ´«Îļþ
    */
    public function uploadfile(){
        //ÎļþÉÏ´«²¿*Ö
        // ´¦ÀiÎļþ
        // $data = '';
        $this->load->helper('url');
        $formpic = key($_FILES);
        //Îļþ´¦Ài²¿*Ö
        if(false === empty($_FILES[$formpic]['tmp_name'])){
          //ÉeÖÃÎļþÉÏ´«µÄÂ*¾¶
          $upload['upload_path'] = "./public/img/";
          //ÏÞÖÆÎļþÉÏ´«µÄÀaÐÍ
          $upload['allowed_types'] = 'jpeg|jpg|gif|png';
          //ÏÞÖÆÎļþÉÏ´«µÄ´oС
          $upload['max_size'] = 2048;
          //ÉeÖÃÎļþÉÏ´«µÄÂ*¾¶
          $upload['file_name'] = date('YmdHis', time()).rand(10000, 99999);
          //¼ÓÔØÎļþÉÏ´«ÅaÖÃÐÅÏ¢
          $this->load->library('upload', $upload);
          //´¦ÀiÎļþÉÏ´«
          $this->upload->do_upload($formpic);
          //*µ»ØÎļþÉÏ´«ÐÅÏ¢
          $image = $this->upload->data();
          /*
           'file_name' => string '2015071702051718388.jpg' (length=23)
           'file_type' => string 'image/jpeg' (length=10)
           'file_path' => string 'E:/wamp/www/testci/public/img/' (length=30)
           'full_path' => string 'E:/wamp/www/testci/public/img/2015071702051718388.jpg' (length=53)
           'raw_name' => string '2015071702051718388' (length=19)
           'orig_name' => string '2015071702051718388.jpg' (length=23)
           'client_name' => string 'u=415761610,1548338330&fm;=116&gp;=0.jpg' (length=38)
           'file_ext' => string '.jpg' (length=4)
           'file_size' => float 3.74
           'is_image' => boolean true
           'image_width' => int 146
           'image_height' => int 220
           'image_type' => string 'jpeg' (length=4)
           'image_size_str' => string 'width="146" height="220"' (length=24)
           */
          //var_dump($image);
          //*µ»ØÎļþÉÏ´«Ãu×Ö
          $data = $image['file_name'];
          $this->dealthumb($image['full_path']);
          $this->overlay($image['full_path'],$image['file_path']);
          $this->transroate($image['full_path'],$image['file_path']);//
          $thumbdata = '';
          //Éu³ÉËoÂÔͼÃu³Æ
          $pos = strripos($image['file_name'], ".");
          $newname = substr($image['file_name'], 0,$pos)."_thumb".substr($image['file_name'], $pos);
          if(file_exists($image['file_path'].$newname)){
            $thumbdata = $newname;
          }
        }
        //$dirroot = $_SERVER['DOCUMENT_ROOT'];
        //$this->dealthumb($dirroot."/public/img/".$data);
        //ÉÏ´«Ê§°Ü
        if(!$data){
          echo json_encode(array('status'=>0,'msg'=>"ÉÏ´«Ê§°Ü£¡"));
        }else{
        //ÉÏ´«³É¹¦
          echo json_encode(array(
            'name'=>$data,
            'pic'=>base_url()."public/img/".$data,
            'picthumb'=>$thumbdata == '' ?$data:$thumbdata
            ));
        }
    }

ÏÂÃaeÊÇÇ°¶ËµÄ»u±¾html´uÂe£º

    <!doctype html>
    <html>
    <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" href="/public/stylesheets/bootstrap.min.css" />
    <link rel="stylesheet" href="/public/stylesheets/bootstrap-responsive.min.css" />
    <link rel="stylesheet" href="/public/stylesheets/matrix-style.css" />
    <link rel="stylesheet" href="/public/stylesheets/matrix-media.css" />
    <script type="text/javascript" src="/public/javascripts/jquery.min.js"></script>
    <script type="text/javascript" src="/public/javascripts/jquery.form.js"></script>
    <script type="text/javascript" src="/public/javascripts/jquery.validate.js"></script>
    <style type="text/css">
    body{background:#eeeeee; margin:0px;}
    </style>
    </head>
    <body>
    <div class="control-group">
      <label class="control-label"> *ÖÏilogo£º </label>
      <div class="controls">
         <input type="file" name="sharepic" id="sharepic"/>
         <input type="hidden" name="act_sharepic" value="" id="act_sharepic"/>(<sapn class="fred">×i¼Ñ´oСΪ 80 X 80 ÏñËØ</sapn>)
         <p style="margin:20px 0;"><img src="/public/img/default.png" alt="" id="sharepic_img"></p>
      </div>
    </div>
    <script type="text/javascript">
    $(function () {
      /*****************ͼƬÉÏ´«²¿*Ö¿ªÊ¼ *******************/
      var act = "<form class='myupload' action='"+"<?php echo site_url('mytest/uploadfile');?>"+"' method='post' enctype='multipart/form-data'></form>";
      $("#sharepic").change(function(){
        $(this).wrap(act);
        $(this).parent(".myupload").ajaxSubmit({
          dataType: 'json',
          success: function(data) {
            var src = data.pic;
            //¸u¸ÄÔ¤ÀÀͼÏñµØÖ*
            $('#sharepic_img').attr("src",src);
            $('#act_sharepic').val(data.name);
            $('#sharepic').unwrap();
          },
          error:function(xhr){
            alert(JSON.parse(xhr));
          }
        });
      });
    })
    </script>
    </body>
    </html>

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