Practical file upload class in php_PHP tutorial

class upload{
    /**
* The name attribute of the html form input field, the default is 'file'
​*/
    var $file_field = 'file' ;
   
    /**
* $_files array
​*/
    var $file_array;
   
    /**
* * Save path, the default is the current path
​*/
    var $save_path = '';
   
    /**
* Custom file name
​*/
    var $define_name;   
   
    /**
* The final saved file name
​*/
    var $name;
   
    /**
* File size, unit: bytes
​*/
    var $size;
   
    /**
* File extension, excluding "."
​*/
    var $ext;    
   
    /**
* * File types allowed to be uploaded, no restrictions by default
​*/
    var $allow_ext = array();
   
    /**
* * File types allowed to be uploaded, no restrictions by default
​*/
    var $allow_size = false;
   
    /**
* If a file with the same name already exists, whether to allow overwriting, the default is not to overwrite.
​*/
    var $overwrite = false;
   
    /**
* Error message
​*/
    var $error_code;
   
    /**
* Constructor
​*/
    public function __construct(){
        if(!is_uploaded_file($_files[$this->file_field]['tmp_name'])){
            die("非法上传！");
        }else{
            $this->file_array = $_files[$this->file_field];
            $this->name = $this->getpro('name');
            $this->size = $this->getpro('size');
            $this->ext = $this->getpro('ext');   
        }
    }
   
   
    /**
* Upload operation function
* @abstract Return true if the upload is successful, otherwise return the corresponding error code
* @return string or bool
​*/
    public function upload(){
        if(is_uploaded_file($this->file_array['tmp_name'])){   
               
            if(!empty($this->allow_ext)){
                if(!in_array($this->ext,$this->allow_ext)){
                    $this->error_code = "不允许上传该类型文件！";   
                    return false;
                }
            }
           
            if(!@file_exists(iconv('utf-8','gbk',$this->save_path))){
                      $this->error_code = "The file upload directory does not exist!";
                     return false;
            }
                                                                    If(!is_writable(iconv('utf-8','gbk',$this->save_path))){
                    $this->error_code = "The file upload directory cannot be written!";
                     return false;
            }
                                                                    If($this->overwrite==false && @file_exists(iconv('utf-8','gbk',$this->save_path.$this->name))){
                                             $this->error_code = "The file already exists!";
                      return false;
            }
                                                                    If($this->allow_size){
If($this->size > $this->allow_size){
​​​​​​​​​​                            return false;
                }
            }
                                                                    $result = @move_uploaded_file($this->file_array['tmp_name'],iconv("utf-8","gbk",$this->save_path.$this->getpro("name"))) ;                            
                if($result){
                    return true;
               }else{
switch($this->file_array['error']){
                 case 1:
                                                                                                                                                                                                                        $this->error_code = "The uploaded file exceeds the value of the upload_max_filesize option limit!";
break;
                 case 2:
$this->error_code = "The size of the uploaded file exceeds the value specified by the max_file_size option!";
break;
                  case 3:
​​​​​​​​​​​​ break;
case 4:
​​​​​​​​​​​ break;
case 6:
                                                                                                                                                                                                                                                                                             through break;
case 7:
$this->error_code = "File writing failed!";
break;
                }
                      return false;
            }
}
}
 
/**
* Upload operation function
* @abstract Get file attributes
* @param $itme: string type, valid inputs are name (file name), ext (file extension), size (file size)
* @return string
​*/
Public function getpro($item){
         switch($item){
            case "name":
$filename = $this->file_array['name'];
                       return isset($this->define_name) ? $this->define_name.".".$this->ext : $filename;
Break;
case "ext":
$filename = $this->file_array['name'];
                      $filter = explode(".",$filename);
                     return strtolower($filter[count($filter)-1]);
             break;
            case "size":
                      return $this->file_array['size'];
             break;
                 default:
die("Illegal operation!");
             break;
}
}
}

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