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; 
  } 
 } 
?> 

以上就是本文的全部内容，希望对大家学习php程序设计有所帮助。