A complete PHP file upload class example explanation, _PHP tutorial

A complete PHP file upload class example explanation,

This file upload class can customize the upload file size, upload file type and file storage address. There is a The problem is that if a Chinese file name is uploaded, garbled characters will appear, so the solution is to save the page as uft8.

The following is the code to share with you:

<&#63;php
define('NO_FILE', '不存在上传文件');
define('NOT_ALLOW_EXT', '文件类型不在允许范围内');
define('NOT_ALLOW_SIZE', '文件大小不在允许范围内');
define('HAS_THE_FILE', '该文件已经存在');
define('UPLOAD_FAILED', '上传失败');
define('UPLOAD_SUCCESS', '上传成功');
class file_uploader
{
  var $_file;
  var $_filesize;
  var $_fileext;
  var $_filedir;
  var $_filename;
  var $_filetmpname;
  
  var $allowsize;
  var $allowext;
  
  var $neednewname;
  var $newname;
  var $syslang;
  
  var $report;
  
  function ready($filedir = '', $file, $allowsize = '', $allowext = '', $neednewname = false, $report = 0){
    $this->_filedir = is_dir($filedir) &#63; $filedir : '';
    if(empty($file) || !isset($file['size']) || $file['size'] == 0) $this->error(NO_FILE);
    $this->_filesize = $file['size'];
    $this->_filename = $file['name'];
    $this->_filetmpname = $file['tmp_name'];
    
    $this->allowsize = $allowsize;
    $this->allowext = $allowext;
    
    $this->neednewname = ($neednewname) &#63; true : false;
    $this->newname = '';
    
    $this->report = $report;
  }
  
  function do_upload(){
    if(!is_uploaded_file($this->_filetmpname)) $this->error(NO_FILE);
    if($this->chk_ext()){
      $this->error(NOT_ALLOW_EXT);
      return '';
    }
    if($this->chk_size()){
      $this->error(NOT_ALLOW_SIZE);
      return '';
    }
    if($this->neednewname) $this->newname = $this->generate_name().".".$this->get_fileext();
    if($this->chk_hasfile()){
      $this->error(HAS_THE_FILE);
      return '';
    }
    $filename = empty($this->newname) &#63; @iconv('utf-8','gb2312',$this->_filename) : $this->newname;
    @chmod($this->_filedir.$filename, 0777);
    if(move_uploaded_file($this->_filetmpname, $this->_filedir.$filename)){
      return $this->result();
    }else{
      $this->error(UPLOAD_FAILED);
      return '';
    }
  }
  
  function chk_ext(){
    if(empty($this->allowext) || in_array($this->get_fileext(), explode("|",$this->allowext))) return false;
    return true;
  }
  
  function chk_size(){
    if(empty($this->allowsize) || get_filesize <= $this->allowsize*1024*1024) return false;
    return true;
  }
  
  function get_filesize(){
    return $this->_filesize;
  }
  
  function get_fileext(){
    return substr($this->_filename,strrpos($this->_filename,".")+1);
  }
  
  function generate_name(){
    return substr(md5(time()),26);
  }
  
  function chk_hasfile(){
    return is_file($this->_filedir.$this->_filename);
  }
  
  function error($tip){
    echo $tip;
  }
  
  function result(){
    if($this->report){
      $filename = empty($this->newname) &#63; $this->_filename : $this->newname;
      $arr = array('filename' => $filename, 'filesize' => $this->_filesize, 'tip' => UPLOAD_SUCCESS);
      return $arr;
    }else{
      return UPLOAD_SUCCESS;
    }
  }
}
/***使用方法与参数说明***/
/***
  第一个参数$dir 为上传文件存放的路径
   第二个参数为$_FILES 为你那个上传文件变量
   第三个参数允许文件大小 单位为MB
  第四个参数允许的文件类型 格式为jpg|png|gif
  第五个参数是否需要生成新的文件名
   第六个参数为返回的提示格式 0为直接提示上传正确 1则返回一个数组array('filename' => $filename, 'filesize' => $this->_filesize, 'tip' => UPLOAD_SUCCESS);
***/
//require("类文件");
//$u = new file_uploader;
//$u->ready($dir, $_FILES['upload_file'], false, false, true, 0);
//echo $u->do_upload();
&#63;>

Call method
The code is as follows

$dir = 'upload/';
  require("upload_class.php");
  $u = new file_uploader;
  $u->ready($dir, $_FILES['upload_file'], false, false, true, 0);
  echo $u->do_upload();

Additional explanation: There are still some problems with encoding. I submitted the data on the utf8 page, so if the generated file keeps the original Chinese name, it will be in the file You can see garbled names in the folder. If you don't want garbled names, you need to convert the encoding.

The above is the entire content of this article, I hope it will be helpful to everyone’s study.

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