PHP教程：php简单的上传类分享

PHP实例
<?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;
  }
}