非常经典的PHP文件上传类分享

文件上传是项目开发中比较常见的功能，但文件上传的过程比较繁琐，只要是有文件上传的地方就需要编写这些复杂的代码。为了能在每次开发中降低功能的编写难度，也为了能节省开发时间，通常我们都会将这些反复使用的一段代码封装到一个类中。

<?php
/**
 +-----------------------------------------------------------------------------
 * 文件上传类
 +-----------------------------------------------------------------------------
 * @author Administrator
 +-----------------------------------------------------------------------------
 */
 class FileUpload{ 

  private $filepath;  //保存路径
  private $allowtype=array('gif','jpg','jpeg','png','txt');
  private $maxsize=1000000;  //最大允许上传大小
  private $israndname=true; //是否随机
  private $orginame; //原始文件名
  private $tmpname;  //临时文件名
  private $newname;  //新文件名
  private $filetype; //文件类型
  private $filesize; //文件大小
  private $errornum=''; //错误号
  private $errormsg; //错误信息
/**
 +------------------------------------------------------------------------------
 *构造函数
 +------------------------------------------------------------------------------
 * @param string $savepath  保存路径
 * @param string $allowtype 允许类型
 * @param string $maxsize  允许大小
 *
 +------------------------------------------------------------------------------
 */
  function __construct($option=array()){
     foreach ($option as $key=>$value){ 

      if (!in_array($key,get_class_vars(get_class($this)))){
        continue;
       }
      $this->setOption($key, $value);
     }
  }
  function uploadfile($field) {
     $return=true;
    if (!$this->CheckPath()) {
      $this->errormsg=$this->geterrorNum();
      return false;
    }
    $name=$_FILES[$field]['name'];
    $tmpname=$_FILES[$field]['tmp_name'];
    $filesize=$_FILES[$field]['size'];
    $error=$_FILES[$field]['error'];
     if (is_array($name)) {
      $errors=array();
       for ($i=0;$i<count($name);$i++){
        if ($this->getFile($name[$i],$tmpname[$i],$filesize[$i],$errors[$i])) {
          if (!$this->CheckSize() && !$this->CheckType()) {
            $errors=$this->getErrorNum();
            return false;
            }
        }else{
            $errors=$this->getErrorNum();
            return false;
        }
        if (!$return) {
          $this->getFile();
        }
       }
       if ($return) {
        $fileNames=array();
        for ($i=0;$i<count($name);$i++){
          if ($this->getFile($name[$i], $tmpname[$i], $filesize[$i], $filesize[$i])) {
            $this->SetFileName();
            if (!$this->MoveFile()) {
              $errors[]=$this->getErrorNum();
              $return=false;
            }else{
              $fileNames[]=$this->getNewName();
            }
          }
        }
        $this->newname=$fileNames;
       }
        $this->errormsg=$errors;
        return $return; 

     }else{
      if($this->getFile($name,$tmpname,filesize,$error)){
        if(!$this->CheckSize()){
          return false;
        }
        if(!$this->CheckType()){
          return false;
        }
         $this->SetFileName();
        if ($this->MoveFile()) {
            return true;
        }
      }else{
      return false;
      } 

      if (!$return) {
      $this->setOption('ErrorNum', 0);
      $this->errormsg=$this->geterrorNum();
      }
     return $return;
   }
  }
  /**
   +------------------------------------------------------------------------
   *设置类属性值函数
   +------------------------------------------------------------------------
   * @param mix $key
   * @param mix $value
   */
  private function setOption($key,$value){
    $key=strtolower($key);
    $this->$key=$value;
  }
  /**
   +---------------------------------------------------------------------------
   * 获取文件变量参数函数
   +---------------------------------------------------------------------------
   * @param string $name
   * @param string $tmp_name
   * @param number $size
   * @param number $error
   */
  private function getFile($name,$tmpname,$filetype,$filesize,$error=0){  

    $this->setOption('TmpName', $tmpname);
    $this->setOption('OrgiName', $name);
    $arrstr=explode('.', $name);
    $this->setOption('FileType', $arrstr[count($arrstr)-1]);
    $this->setOption('FileSize', $filesize);
    return true;
  }
  /**
   +-------------------------------------------------------------------------
   * 检查上传路径函数
   +-------------------------------------------------------------------------
   * @return boolean
   */
  private function CheckPath(){
    if(empty($this->filepath)){
      $this->setOption('ErrorNum', -5);
      return false;
    }
    if (!file_exists($this->filepath)||!is_writable($this->filepath)) {
       if (!@mkdir($this->filepath,0755)) {
         $this->setOption('ErrorNum',-4);
         return false;
       }
    }
    return true;
  }
  private function Is_Http_Post(){
    if (!is_uploaded_file($this->tmpname)) {
      $this->setOption('ErrorNum',-6);
      return false;
    }else{
      return true;
    }
  }
  /**
   +--------------------------------------------------------------------
   *检查文件尺寸函数
   +--------------------------------------------------------------------
   * @return boolean
   */
  private function CheckSize(){
    if ($this->filesize>$this->maxsize) {
      $this->setOption('ErrorNum', -2);
      return false;
    }else{
      return true;
    }
  }
  /**
   +---------------------------------------------------------------
   * 检查文件类型函数
   +---------------------------------------------------------------
   * @return boolean
   */
  private function CheckType(){
    if (in_array($this->filetype, $this->allowtype)) {
      return true;
    }else{
      $this->setOption('ErrorNum', -1);
      return false;
    }
  }
  private function SetFileName(){
    if ($this->israndname) {
      $this->setOption('NewName', $this->RandName());
    }else{
      $this->setOption('NewName',$this->orginame);
    }
  }
  /**
   +-----------------------------------------------------------------
   * 获取新文件名
   +------------------------------------------------------------------
   */
  public function getNewName() {
    return $this->newname;
  }
  private function RandName(){
    $rule=date("YmdHis").rand(0, 999);
    return $rule.'.'.$this->filetype;
  }
  private function MoveFile(){
    if ($this->errornum) {
      $filepath=rtrim($this->filaepath,'/').'/';
      $filepath.=$this->newname;
      if (@move_uploaded_file($this->tmpname,$filepath)) {
        return true;
       }else{
        $this->errormsg=$this->setOption('ErrorNum',-3 );
       }
    }else{
      return false;
    }
  }
  /**
   +----------------------------------------------------------------
   * 错误信息函数
   +----------------------------------------------------------------
   * @return string
   */
   function getErrorNum() {
    $erstr="上传文件<font color='red'>{$this->orginame}</font>出错";
    switch ($this->errornum) {
      case 4:
       $erstr.="没有文件被上传";
        break;
      case 3:
       $erstr.="文件只被部分上传";
        break;
      case 2:
       $erstr.="上传文件超过了HTML表单MAX_FILE_SIZE指定的值";
        break;
      case 1:
       $erstr.="上传文件超过了php.ini配置文件中upload_max_filesize的值";
        break;
      case 0:
       $erstr="上传{$this->orginame}成功";
        break;
      case -1:
       $erstr="未允许的类型";
        break;
      case -2:
       $erstr.="文件过大，不能超过{$this->maxsize}个字节";
        break;
      case -3:
       $erstr.="上传失败";
        break;
      case -4:
       $erstr="创建上传目录失败，请重新指定上传目录";
        break;
      case -5:
       $erstr="未指定上传路径";
        break;
      case -6:
       $erstr="非法操作";
        break;
      default:
       $erstr.="未知错误"; 

    }
    return $erstr;
  }
 }
?> 

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