<?php
class UploadFile{
  var $inputName;         //控件名
  var $allowType = array(
        'image/gif','image/jpg','image/jpeg','image/png','image/x-png','image/pjpeg'
  );                //上傳類型
  var $allowSize = 2097152;  //限制大小
  var $saveDir = UPLOAD;   //保存目錄
  var $isRename = true;        //是否重命名，默認(rèn)為true
  var $errID = 0;           //錯(cuò)誤代碼，默認(rèn)為0
  var $errMsg = "";          //錯(cuò)誤信息
  var $savePath = "";         //保存路徑

  function __construct($inputName,$allowType="",$allowSize="",$saveDir="",$isRename=true){
    if(empty($inputName)){
      $this->chk_err(-1);    //無(wú)傳入控件名
    }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'])){
      $this->chk_err(4);  //沒有文件被上傳
    }else{
      if(is_uploaded_file($_FILES[$this->inputName]['tmp_name'])){
        return true;
      }else{
        $this->chk_err(-2);    //文件上傳不合法
      }
    }
  }

  function chk_type(){
    if(!in_array($_FILES[$this->inputName]['type'],$this->allowType)){
      $this->chk_err(-3);     //上傳的文件類型不被允許
    }else{
      return true;
    }
  }

  function chk_size(){
    if($_FILES[$this->inputName]['size'] > $this->allowSize){
      $this->chk_(-4);     //上傳的文件過大
    }else{
      return true;
    }
  }

  function move_uploaded(){    //移動(dòng)上傳文件
    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表示為上傳的為原圖
    }else{
      $file_newname = $_FILES[$this->inputName]['name'];
    }
    
    if(!file_exists($this->saveDir)){    //判斷保存目錄是否存在
      mkdir($this->saveDir,0777,true);  //建立保存目錄
    }

    //移動(dòng)文件
    $result = move_uploaded_file($_FILES[$this->inputName]['tmp_name'],$this->saveDir."/".$file_newname);

    if($result){
      $path = $this->savePath = $this->saveDir.$file_newname;    //文件的成功保存路徑
      return $path;
    }else{
      $this->chk_err($_FILES[$this->inputName]['error']);
    }
  
  }

  //判斷出錯(cuò)信息
  function chk_err($errID){
    $this->errID = $errID;
    switch($this->errID){
      case -4:
        $this->errMsg = "上傳的文件過大";
        break;
      case -3:
        $this->errMsg = "上傳的文件類型不被允許";
        break;
      case -2:
        $this->errMsg = "文件上傳不合法";
        break;
      case -1:
        $this->errMsg = "無(wú)控件名傳入";
        break;
      case 1:
        $this->errMsg = '上傳的文件超出了php.ini中upload_max_filesize設(shè)定的最大值';
        break;
      case 2:
        $this->errMsg = '上傳文件的大小超過了HTML表單中MAX_FILE_SIZE選項(xiàng)指定的值';
        break;
      case 3:
        $this->errMsg = '文件只有部分被上傳';
        break;
      case 4:
        $this->errMsg = '沒有文件被上傳';
        break;
      default:
        break;
    }
    return false;
  
  }

  function get_errMsg(){
    echo $this->errMsg; //輸出錯(cuò)誤信息
  }

  /**
   +----------------------------------------------------------
   * 取得圖像信息
   *
   +----------------------------------------------------------
   * @static
   * @access public
   +----------------------------------------------------------
   * @param string $image 圖像文件名
   +----------------------------------------------------------
   * @return mixed
   +----------------------------------------------------------
   */
  function getImageInfo($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;
    }
  }

  /**
   +----------------------------------------------------------
   * 生成縮略圖
   +----------------------------------------------------------
   * @static
   * @access public
   +----------------------------------------------------------
   * @param string $image 原圖
   * @param string $type 圖像格式
   * @param string $thumbname 縮略圖文件名
   * @param string $maxWidth 寬度
   * @param string $maxHeight 高度
   * @param string $position 縮略圖保存目錄
   * @param boolean $interlace 啟用隔行掃描
   * @param boolean $is_save 是否保留原圖
   +----------------------------------------------------------
   * @return void
   +----------------------------------------------------------
   */
   
  function thumb($image,$is_save=true,$suofang=0,$type='',$maxWidth=500,$maxHeight=500,$interlace=true){
    // 獲取原圖信息
    $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); // 計(jì)算縮放比例
        if($scale>=1) {
          // 超過原圖大小不再縮略
          $width  = $srcWidth;
          $height = $srcHeight;
        }else{
          // 縮略圖尺寸
          $width = (int)($srcWidth*$scale);  //147
          $height = (int)($srcHeight*$scale);  //199
        }
      }
      // 載入原圖
      $createFun = 'ImageCreateFrom'.($type=='jpg'?'jpeg':$type);
      $srcImg   = $createFun($image);

      //創(chuàng)建縮略圖
      if($type!='gif' && function_exists('imagecreatetruecolor'))
        $thumbImg = imagecreatetruecolor($width, $height);
      else
        $thumbImg = imagecreate($width, $height);

      // 復(fù)制圖片
      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($thumbImg, false);//取消默認(rèn)的混色模式
        //imagesavealpha($thumbImg,true);//設(shè)定保存完整的 alpha 通道信息
        $background_color = imagecolorallocate($thumbImg, 0,255,0); // 指派一個(gè)綠色
        imagecolortransparent($thumbImg,$background_color); // 設(shè)置為透明色，若注釋掉該行則輸出綠色的圖
      }
      // 對(duì)jpeg圖形設(shè)置隔行掃描
      if('jpg'==$type || 'jpeg'==$type)   imageinterlace($thumbImg,$interlace);
      //$gray=ImageColorAllocate($thumbImg,255,0,0);
      //ImageString($thumbImg,2,5,5,"ThinkPHP",$gray);
      // 生成圖片
      $imageFun = 'image'.($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);    //大頭像
        $thumbname02 = substr_replace($image,"02.".$type,$length);    //小頭像
        $imageFun($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' => $thumbname02);  //返回包含大小頭像路徑的數(shù)組
      }else{
        if($is_save == false){                      //縮略圖覆蓋原圖，縮略圖的路徑還是原圖路徑
          $imageFun($thumbImg,$image,100);
        }else{
          $thumbname03 = substr_replace($image,"03.".$type,$length);  //縮略圖與原圖同時(shí)存在，
          $imageFun($thumbImg,$thumbname03,100);

          imagedestroy($thumbImg);
          imagedestroy($srcImg);
          return $thumbname03 ;          //返回縮略圖的路徑，字符串
        }
      }

     }
     return false;
  }
}