CI框架封装的常用图像处理方法(缩略图,水印,旋转,上传等)

本文实例讲述了CI框架封装的常用图像处理方法。分享给大家供大家参考，具体如下：

其实微信手机端上图时，列表图最好是缩略图，节省流量，这不，又被移动坑了一把，话费签一分就停机，流量欠到90块才停机，我也是醉了。。。

不说废话了，下面是用CI 的内置处理图像的库写的，小弟不才，遗漏之处敬请指出，谢谢。

/*** 生成缩略图* @param  $path 原图的本地路径* @return null 创建一个 原图_thumb.扩展名 的文件**/public function dealthumb($path){    $config['image_library'] = 'gd2';    $config['source_image'] = $path;    $config['create_thumb'] = TRUE;    //生成的缩略图将在保持纵横比例 在宽度和高度上接近所设定的width和height    $config['maintain_ratio'] = TRUE;    $config['width'] = 80;    $config['height'] = 80;    $this->load->library('image_lib', $config);    $this->image_lib->resize();    $this->image_lib->clear();}/** 处理图像旋转*/public function transroate($path,$imgpath){    $this->load->library('image_lib');    //(必须)设置图像库    $config['image_library'] = 'gd2';    $newname = time().'_rote.jpg';    //设置图像的目标名/路径    $config['new_image'] =$imgpath.$newname;    //(必须)设置原始图像的名字/路径    $config['source_image'] = $path;    //决定新图像的生成是要写入硬盘还是动态的存在    $config['dynamic_output'] = FALSE;    //设置图像的品质。品质越高，图像文件越大    $config['quality'] = '90%';    //有5个旋转选项 逆时针90 180 270 度 vrt 竖向翻转 hor 横向翻转    $config['rotation_angle'] = 'vrt';    $this->image_lib->initialize($config);    if(@$this->image_lib->rotate()){      $this->image_lib->clear();      return $config['new_image'];    }else{      $this->image_lib->clear();      return '';    }}/*** 处理图像水印*/public function overlay($path,$imgpath){    $this->load->library('image_lib');    $newname = time().'_over.jpg';    //设置新图像名称    $config['new_image'] =$imgpath.$newname;    //调用php gd库 绘图    $config['image_library'] = 'gd2';    //源图像 本地地址    $config['source_image'] = $path;    //覆盖文字    $config['wm_text'] = 'Copyright 2015 - Friker';    //覆盖类型 文字/图像    $config['wm_type'] = 'text';    //文字字体类型    //$config['wm_font_path'] = 'C:/Windows/Fonts/vrinda.ttf';    //字体大小    $config['wm_font_size'] = '16';    //字体颜色    $config['wm_font_color'] = 'ff0000';    //垂直方向距离顶端距离    $config['wm_vrt_alignment'] = '20';    //水平方向距离左端距离    $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 '';    }}/***  处理图片上传*  文件上传类 通过前台 上传文件*/public function uploadfile(){    //文件上传部分    // 处理文件    // $data = '';    $this->load->helper('url');    $formpic = key($_FILES);    //文件处理部分    if(false === empty($_FILES[$formpic]['tmp_name'])){      //设置文件上传的路径      $upload['upload_path'] = "./public/img/";      //限制文件上传的类型      $upload['allowed_types'] = 'jpeg|jpg|gif|png';      //限制文件上传的大小      $upload['max_size'] = 2048;      //设置文件上传的路径      $upload['file_name'] = date('YmdHis', time()).rand(10000, 99999);      //加载文件上传配置信息      $this->load->library('upload', $upload);      //处理文件上传      $this->upload->do_upload($formpic);      //返回文件上传信息      $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);      //返回文件上传名字      $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 = '';      //生成缩略图名称      $pos = strripos($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);    //上传失败    if(!$data){      echo json_encode(array('status'=>0,'msg'=>"上传失败！"));    }else{    //上传成功      echo json_encode(array(        'name'=>$data,        'pic'=>base_url()."public/img/".$data,        'picthumb'=>$thumbdata == '' ?$data:$thumbdata        ));    }}