php简单的上传类分享

<?php
class uploadfile{
  var $inputname;         //控件名
  var $allowtype = array(
        'image/gif','image/jpg','image/jpeg','image/png','image/x-png','image/pjpeg'
  );                //上传类型
  var $allowsize = 2097152;  //限制大小
  var $savedir = upload;   //保存目录
  var $isrename = true;        //是否重命名，默认为true
  var $errid = 0;           //错误代码，默认为0
  var $errmsg = "";          //错误信息
  var $savepath = "";         //保存路径

  function __construct($inputname,$allowtype="",$allowsize="",$savedir="",$isrename=true){
    if(empty($inputname)){
      $this->chk_err(-1);    //无传入控件名
    }else{
      $this->inputname = $inputname;
    }

    if(!empty($allowtype)) $this->allowtype = $allowtype;
    if(!empty($allowsize)) $this->allowsize = $allowsize;
    if(!empty($savedir)) $this->savedir = $savedir;
    if(!empty($isrename)) $this->isrename = $isrename;
  }

  function is_uploaded(){
    if(empty($_files[$this->inputname]['name'])){
      $this->chk_err(4);  //没有文件被上传
    }else{
      if(is_uploaded_file($_files[$this->inputname]['tmp_name'])){
        return true;
      }else{
        $this->chk_err(-2);    //文件上传不合法
      }
    }
  }

  function chk_type(){
    if(!in_array($_files[$this->inputname]['type'],$this->allowtype)){
      $this->chk_err(-3);     //上传的文件类型不被允许
    }else{
      return true;
    }
  }

  function chk_size(){
    if($_files[$this->inputname]['size'] > $this->allowsize){
      $this->chk_(-4);     //上传的文件过大
    }else{
      return true;
    }
  }

  function move_uploaded(){    //移动上传文件
    if(!$this->is_uploaded()){
      return false;
    }

    if(!$this->chk_size()){
      return false;
    }

    if(!$this->chk_type()){
      return false;
    }

    //重命名
    if($this->isrename){
      $arrtmp = pathinfo($_files[$this->inputname]['name']);
      $extension = strtolower($arrtmp['extension']);
      $file_newname = date("ymdhis").rand(1000,9999)."00.".$extension; //重命名新文件， 00表示为上传的为原图
    }else{
      $file_newname = $_files[$this->inputname]['name'];
    }
    
    if(!file_exists($this->savedir)){    //判断保存目录是否存在
      mkdir($this->savedir,0777,true);  //建立保存目录
    }

    //移动文件
    $result = move_uploaded_file($_files[$this->inputname]['tmp_name'],$this->savedir."/".$file_newname);

    if($result){
      $path = $this->savepath = $this->savedir.$file_newname;    //文件的成功保存路径
      return $path;
    }else{
      $this->chk_err($_files[$this->inputname]['error']);
    }
  
  }

  //判断出错信息
  function chk_err($errid){
    $this->errid = $errid;
    switch($this->errid){
      case -4:
        $this->errmsg = "上传的文件过大";
        break;
      case -3:
        $this->errmsg = "上传的文件类型不被允许";
        break;
      case -2:
        $this->errmsg = "文件上传不合法";
        break;
      case -1:
        $this->errmsg = "无控件名传入";
        break;
      case 1:
        $this->errmsg = '上传的文件超出了php.ini中upload_max_filesize设定的最大值';
        break;
      case 2:
        $this->errmsg = '上传文件的大小超过了html表单中max_file_size选项指定的值';
        break;
      case 3:
        $this->errmsg = '文件只有部分被上传';
        break;
      case 4:
        $this->errmsg = '没有文件被上传';
        break;
      default:
        break;
    }
    return false;
  
  }

  function get_errmsg(){
    echo $this->errmsg; //输出错误信息
  }

  /**
   +----------------------------------------------------------
   * 取得图像信息
   *
   +----------------------------------------------------------
   * @static
   * @access public
   +----------------------------------------------------------
   * @param string $image 图像文件名
   +----------------------------------------------------------
   * @return mixed
   +----------------------------------------------------------
   */
  function getimageinfo($img) {
    $imageinfo = getimagesize($img);
    if( $imageinfo!== false) {
      $imagetype = strtolower(substr(image_type_to_extension($imageinfo[2]),1));
      $imagesize = filesize($img);
      $info = array(
        "width"    =>$imageinfo[0],
        "height"  =>$imageinfo[1],
        "type"    =>$imagetype,
        "size"    =>$imagesize,
        "mime"    =>$imageinfo['mime'],
      );
      return $info;
    }else {
      return false;
    }
  }

  /**
   +----------------------------------------------------------
   * 生成缩略图
   +----------------------------------------------------------
   * @static
   * @access public
   +----------------------------------------------------------
   * @param string $image 原图
   * @param string $type 图像格式
   * @param string $thumbname 缩略图文件名
   * @param string $maxwidth 宽度
   * @param string $maxheight 高度
   * @param string $position 缩略图保存目录
   * @param boolean $interlace 启用隔行扫描
   * @param boolean $is_save 是否保留原图
   +----------------------------------------------------------
   * @return void
   +----------------------------------------------------------
   */
   
  function thumb($image,$is_save=true,$suofang=0,$type='',$maxwidth=500,$maxheight=500,$interlace=true){
    // 获取原图信息
    $info = $this->getimageinfo($image);
     if($info !== false) {
      $srcwidth = $info['width'];
      $srcheight = $info['height'];
      $type = empty($type)?$info['type']:$type;
      $type = strtolower($type);
      $interlace = $interlace? 1:0;
      unset($info);
      if ($suofang==1) {
        $width = $srcwidth;
        $height = $srcheight;
      } else {
        $scale = min($maxwidth/$srcwidth, $maxheight/$srcheight); // 计算缩放比例
        if($scale>=1) {
          // 超过原图大小不再缩略
          $width  = $srcwidth;
          $height = $srcheight;
        }else{
          // 缩略图尺寸
          $width = (int)($srcwidth*$scale);  //147
          $height = (int)($srcheight*$scale);  //199
        }
      }
      // 载入原图
      $createfun = 'imagecreatefrom'.($type=='jpg'?'jpeg':$type);
      $srcimg   = $createfun($image);

      //创建缩略图
      if($type!='gif' && function_exists('imagecreatetruecolor'))
        $thumbimg = imagecreatetruecolor($width, $height);
      else
        $thumbimg = imagecreate($width, $height);

      // 复制图片
      if(function_exists("imagecopyresampled"))
        imagecopyresampled($thumbimg, $srcimg, 0, 0, 0, 0, $width, $height, $srcwidth,$srcheight);
      else
        imagecopyresized($thumbimg, $srcimg, 0, 0, 0, 0, $width, $height, $srcwidth,$srcheight);
      if('gif'==$type || 'png'==$type) {
        //imagealphablending($thumbimg, false);//取消默认的混色模式
        //imagesavealpha($thumbimg,true);//设定保存完整的 alpha 通道信息
        $background_color = imagecolorallocate($thumbimg, 0,255,0); // 指派一个绿色
        imagecolortransparent($thumbimg,$background_color); // 设置为透明色，若注释掉该行则输出绿色的图
      }
      // 对jpeg图形设置隔行扫描
      if('jpg'==$type || 'jpeg'==$type)   imageinterlace($thumbimg,$interlace);
      //$gray=imagecolorallocate($thumbimg,255,0,0);
      //imagestring($thumbimg,2,5,5,"thinkphp",$gray);
      // 生成图片
      $imagefun = 'image'.($type=='jpg'?'jpeg':$type); 
      $length = strlen("00.".$type) * (-1);
      $_type = substr($image,-4);
      $length = ($type != $_type ? $length+1 : $length);
      //裁剪
      if ($suofang==1) {
        
        $thumbname01 = substr_replace($image,"01.".$type,$length);    //大头像
        $thumbname02 = substr_replace($image,"02.".$type,$length);    //小头像
        $imagefun($thumbimg,$thumbname01,100);
        $imagefun($thumbimg,$thumbname02,100);

        $thumbimg01 = imagecreatetruecolor(190,195);
        imagecopyresampled($thumbimg01,$thumbimg,0,0,$_post['x'],$_post['y'],190,195,$_post['w'],$_post['h']);

        $thumbimg02 = imagecreatetruecolor(48,48);
        imagecopyresampled($thumbimg02,$thumbimg,0,0,$_post['x'],$_post['y'],48,48,$_post['w'],$_post['h']);

        $imagefun($thumbimg01,$thumbname01,100);
        $imagefun($thumbimg02,$thumbname02,100);
//        unlink($image);
        imagedestroy($thumbimg01);
        imagedestroy($thumbimg02);
        imagedestroy($thumbimg);
        imagedestroy($srcimg);

        return array('big' => $thumbname01 , 'small' => $thumbname02);  //返回包含大小头像路径的数组
      }else{
        if($is_save == false){                      //缩略图覆盖原图，缩略图的路径还是原图路径
          $imagefun($thumbimg,$image,100);
        }else{
          $thumbname03 = substr_replace($image,"03.".$type,$length);  //缩略图与原图同时存在，
          $imagefun($thumbimg,$thumbname03,100);

          imagedestroy($thumbimg);
          imagedestroy($srcimg);
          return $thumbname03 ;          //返回缩略图的路径，字符串
        }
      }

     }
     return false;
  }
}