/**
* 生成縮略圖
* @param  $path 原圖的本地路徑
* @return null 創(chuàng)建一個 原圖_thumb.擴(kuò)展名 的文件
*
*/
public function dealthumb($path){
    $config['image_library'] = 'gd2';
    $config['source_image'] = $path;
    $config['create_thumb'] = TRUE;
    //生成的縮略圖將在保持縱橫比例 在寬度和高度上接近所設(shè)定的width和height
    $config['maintain_ratio'] = TRUE;
    $config['width'] = 80;
    $config['height'] = 80;
    $this->load->library('image_lib', $config);
    $this->image_lib->resize();
    $this->image_lib->clear();
}
/*
* 處理圖像旋轉(zhuǎn)
*/
public function transroate($path,$imgpath){
    $this->load->library('image_lib');
    //(必須)設(shè)置圖像庫
    $config['image_library'] = 'gd2';
    $newname = time().'_rote.jpg';
    //設(shè)置圖像的目標(biāo)名/路徑
    $config['new_image'] =$imgpath.$newname;
    //(必須)設(shè)置原始圖像的名字/路徑
    $config['source_image'] = $path;
    //決定新圖像的生成是要寫入硬盤還是動態(tài)的存在
    $config['dynamic_output'] = FALSE;
    //設(shè)置圖像的品質(zhì)。品質(zhì)越高，圖像文件越大
    $config['quality'] = '90%';
    //有5個旋轉(zhuǎn)選項(xiàng) 逆時針90 180 270 度 vrt 豎向翻轉(zhuǎn) hor 橫向翻轉(zhuǎn)
    $config['rotation_angle'] = 'vrt';
    $this->image_lib->initialize($config);
    if(@$this->image_lib->rotate()){
      $this->image_lib->clear();
      return $config['new_image'];
    }else{
      $this->image_lib->clear();
      return '';
    }
}
/**
* 處理圖像水印
*/
public function overlay($path,$imgpath){
    $this->load->library('image_lib');
    $newname = time().'_over.jpg';
    //設(shè)置新圖像名稱
    $config['new_image'] =$imgpath.$newname;
    //調(diào)用php gd庫 繪圖
    $config['image_library'] = 'gd2';
    //源圖像 本地地址
    $config['source_image'] = $path;
    //覆蓋文字
    $config['wm_text'] = 'Copyright 2015 - Friker';
    //覆蓋類型 文字/圖像
    $config['wm_type'] = 'text';
    //文字字體類型
    //$config['wm_font_path'] = 'C:\Windows\Fonts\vrinda.ttf';
    //字體大小
    $config['wm_font_size'] = '16';
    //字體顏色
    $config['wm_font_color'] = 'ff0000';
    //垂直方向距離頂端距離
    $config['wm_vrt_alignment'] = '20';
    //水平方向距離左端距離
    $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 '';
    }
}
/**
*  處理圖片上傳
*  文件上傳類 通過前臺 上傳文件
*/
public function uploadfile(){
    //文件上傳部分
    // 處理文件
    // $data = '';
    $this->load->helper('url');
    $formpic = key($_FILES);
    //文件處理部分
    if(false === empty($_FILES[$formpic]['tmp_name'])){
      //設(shè)置文件上傳的路徑
      $upload['upload_path'] = "./public/img/";
      //限制文件上傳的類型
      $upload['allowed_types'] = 'jpeg|jpg|gif|png';
      //限制文件上傳的大小
      $upload['max_size'] = 2048;
      //設(shè)置文件上傳的路徑
      $upload['file_name'] = date('YmdHis', time()).rand(10000, 99999);
      //加載文件上傳配置信息
      $this->load->library('upload', $upload);
      //處理文件上傳
      $this->upload->do_upload($formpic);
      //返回文件上傳信息
      $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);
      //返回文件上傳名字
      $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 = '';
      //生成縮略圖名稱
      $pos = strripos($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);
    //上傳失敗
    if(!$data){
      echo json_encode(array('status'=>0,'msg'=>"上傳失??！"));
    }else{
    //上傳成功
      echo json_encode(array(
        'name'=>$data,
        'pic'=>base_url()."public/img/".$data,
        'picthumb'=>$thumbdata == '' ?$data:$thumbdata
        ));
    }
}

<!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"> 分享logo： </label>
  <div class="controls">
     <input type="file" name="sharepic" id="sharepic"/>
     <input type="hidden" name="act_sharepic" value="" id="act_sharepic"/>(<sapn class="fred">最佳大小為 80 X 80 像素</sapn>)
     <p style="margin:20px 0;"><img src="/public/img/default.png" alt="" id="sharepic_img"></p>
  </div>
</div>
<script type="text/javascript">
$(function () {
  /*****************圖片上傳部分開始 *******************/
  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;
        //更改預(yù)覽圖像地址
        $('#sharepic_img').attr("src",src);
        $('#act_sharepic').val(data.name);
        $('#sharepic').unwrap();
      },
      error:function(xhr){
        alert(JSON.parse(xhr));
      }
    });
  });
})
</script>
</body>
</html>