upload_class.php

this is a simple upload files codes with jason(ajax) tech.

<?php
class Upload_Files {

    var $temp_file_name;
    var $file_name;
    var $upload_dir;
    var $upload_log_dir;
    var $max_file_size;
    var $banned_array;
    var $ext_array;
    
    /*
    * purpose: To validate permitted extensions
    * @param none
    * @reutrn boolean
    */
    
    function validate_extension() {
       $file_name = trim($this->file_name);
       $extension = strtolower(strrchr($file_name,"."));
       $ext_array = $this->ext_array;
       $ext_count = count($ext_array);
       
       if (!$file_name) 
       {
           return false;
       } 
       else 
       {
           if (!$ext_array) 
           {
               return true;
           } 
           else 
           {
               foreach ($ext_array as $value) 
               {
                   $first_char = substr($value,0,1);
                       if ($first_char <> ".") 
                       {
                           $extensions[] = ".".strtolower($value);
                       } 
                       else 
                       {
                           $extensions[] = strtolower($value);
                       }
               }
       
               foreach ($extensions as $value) 
               {
                   if ($value == $extension) 
                   {
                       $valid_extension = "TRUE";
                   }                
               }

               if ($valid_extension) 
               {
                   return true;
               } 
               else 
               {
                   return false;
               }
           }
       }
		}
		
		/*
		* purpose: To validate file size
		* @param none
		* @return boolean
		*/
		
		function validate_size() {
       $temp_file_name = trim($this->temp_file_name);
       $max_file_size  = trim($this->max_file_size);
       
       if (!empty($temp_file_name)) 
       {
           $size = filesize($temp_file_name);
           if ($size > $max_file_size) 
           {
              return false;                                                        
           } 
           else 
           {
              return true;
           }
       } 
       else 
       {
          return false;
       }    
    }
    
    /*
		* purpose: Check if the file already exists or not
		* @param none
		* @return boolean
		*/
    
    function existing_file() {
       $file_name  = trim($this->file_name);
       $upload_dir = $this->get_upload_directory();
       
       if ($upload_dir == "ERROR") 
       {
          return true;
       } 
       else 
       {
           $file = $upload_dir . $file_name;
           if (file_exists($file)) 
           {
               return true;
           } 
           else 
           {
               return false;
           }
       }    
    }
    
    /*
		* purpose: Gets the original file size
		* @param none
		* @return file size
		*/
    
    function get_file_size() {
       $temp_file_name = trim($this->temp_file_name);
       $kb = 1024;
       $mb = 1024 * $kb;
       $gb = 1024 * $mb;
       $tb = 1024 * $gb;
       
       if ($temp_file_name) 
       {
          $size = filesize($temp_file_name);
          if ($size < $kb) 
          {
             $file_size = "$size Bytes";
          }
          elseif ($size < $mb) 
          {
             $final = round($size/$kb,2);
             $file_size = "$final KB";
          }
          elseif ($size < $gb) 
          {
             $final = round($size/$mb,2);
             $file_size = "$final MB";
          }
          elseif($size < $tb) 
          {
             $final = round($size/$gb,2);
             $file_size = "$final GB";
          } 
          else 
          {
             $final = round($size/$tb,2);
             $file_size = "$final TB";
          }
       } 
       else 
       {
           $file_size = "ERROR: NO FILE PASSED TO get_file_size()";
       }
       return $file_size;
    }
    
    /*
		* purpose: Gets the maximum file size allowed by the script
		* @param none
		* @return maximum file size
		*/
    
    function get_max_size() {
       $max_file_size = trim($this->max_file_size);
       $kb = 1024;
       $mb = 1024 * $kb;
       $gb = 1024 * $mb;
       $tb = 1024 * $gb;
       
       if ($max_file_size) 
       {
          if ($max_file_size < $kb) 
          {
             $max_file_size = "max_file_size Bytes";
          }
          elseif ($max_file_size < $mb) 
          {
             $final = round($max_file_size/$kb,2);
             $max_file_size = "$final KB";
          }
          elseif ($max_file_size < $gb) 
          {
             $final = round($max_file_size/$mb,2);
             $max_file_size = "$final MB";
          }
          elseif($max_file_size < $tb) 
          {
             $final = round($max_file_size/$gb,2);
             $max_file_size = "$final GB";
          } 
          else 
          {
             $final = round($max_file_size/$tb,2);
             $max_file_size = "$final TB";
          }
       } 
       else 
       {
           $max_file_size = "ERROR: NO SIZE PARAMETER PASSED TO  get_max_size()";
       }
       return $max_file_size;
    }
    
    /*
		* purpose: Check if the user is banned or nor
		* @param none
		* @return boolean
		*/
    
    function validate_user() {
       $banned_array = $this->banned_array;
       $ip           = trim($_SERVER['REMOTE_ADDR']);
       $cpu          = gethostbyaddr($ip);
       $count        = count($banned_array);
       
       if ($count < 1) 
       {
          return true;
       } 
       else 
       {
           foreach($banned_array as $key => $value) 
           {
               if ($value == $ip ."-". $cpu) 
               {
                   return false;
               } 
               else 
               {
                   return true;
               }
           }
       }
    }
    
    /*
		* purpose: Gets the upload directory
		* @param none
		* @return upload directory
		*/
    
    function get_upload_directory() {
       $upload_dir = trim($this->upload_dir);

       if ($upload_dir) 
       {
          $ud_len     = strlen($upload_dir);
          $last_slash = substr($upload_dir,$ud_len-1,1);
       
          if ($last_slash <> "/") 
          {
             $upload_dir = $upload_dir."/";
          } 
          else 
          {
             $upload_dir = $upload_dir;
          }
       
          $handle = @opendir($upload_dir);
          if ($handle) 
          {
             $upload_dir = $upload_dir;
             closedir($handle);
          } 
          else 
          {
             $upload_dir = "ERROR";
          }
       } 
       else 
       {
           $upload_dir = "ERROR";
       }
       return $upload_dir;
    } 
    
    /*
		* purpose: Gets the upload logs directory
		* @param none
		* @return upload log directory
		*/
    
    function get_upload_log_directory() {
       $upload_log_dir = trim($this->upload_log_dir);
       if ($upload_log_dir) 
       {
           $ud_len     = strlen($upload_log_dir);
           $last_slash = substr($upload_log_dir,$ud_len-1,1);
           if ($last_slash <> "/") 
           {
              $upload_log_dir = $upload_log_dir."/";
           } 
           else 
           {
              $upload_log_dir = $upload_log_dir;
           }
           $handle = @opendir($upload_log_dir);
           if ($handle) 
           {
              $upload_log_dir = $upload_log_dir;
              closedir($handle);
           } 
           else 
           {
              $upload_log_dir = "ERROR";
           }
       } 
       else 
       {
           $upload_log_dir = "ERROR";
       }
       return $upload_log_dir;
    }
    
    /*
		* purpose: Upload a file without validation
		* @param none
		* @return boolean
		*/
    
    function upload_file_no_validation() {
       $temp_file_name = trim($this->temp_file_name);
       $file_name      = trim(strtolower($this->file_name));
       $upload_dir     = $this->get_upload_directory();
       $upload_log_dir = $this->get_upload_log_directory();
       $file_size      = $this->get_file_size();
       $ip             = trim($_SERVER['REMOTE_ADDR']);
       $cpu            = gethostbyaddr($ip);
       $m              = date("m");
       $d              = date("d");
       $y              = date("Y");
       $date           = date("m/d/Y");
       $time           = date("h:i:s A");

       if (($upload_dir == "ERROR") OR ($upload_log_dir == "ERROR")) 
       {
           return false;
       } 
       else 
       {
          if (is_uploaded_file($temp_file_name)) 
          {
              if (move_uploaded_file($temp_file_name,$upload_dir . $file_name)) 
              {
                   $log = $upload_log_dir.$y."_".$m."_".$d.".txt";
                   $fp  = fopen($log,"a+");
                   fwrite($fp,"$ip-$cpu | $file_name | $file_size | $date | $time");
                   fclose($fp);
                   return true;
               } 
               else 
               {
                   return false;    
               }
           } 
           else 
           {
               return false;
           }
       }
    }
    
    /*
		* purpose: Upload a file with validation
		* @param none
		* @return boolean
		*/
    
    function upload_file_with_validation() {
       $temp_file_name = trim($this->temp_file_name);
       $file_name      = trim(strtolower($this->file_name));
       $upload_dir     = $this->get_upload_directory();
       $upload_log_dir = $this->get_upload_log_directory();
       $file_size      = $this->get_file_size();
       $ip             = trim($_SERVER['REMOTE_ADDR']);
       $cpu            = gethostbyaddr($ip);
       $m              = date("m");
       $d              = date("d");
       $y              = date("Y");
       $date           = date("m/d/Y");
       $time           = date("h:i:s A");
       $existing_file  = $this->existing_file();        
       $valid_user     = $this->validate_user();        
       $valid_size     = $this->validate_size();        
       $valid_ext      = $this->validate_extension();   
       
       if (($upload_dir == "ERROR") OR ($upload_log_dir == "ERROR")) 
       {
           return false;
       }
       elseif ((((!$valid_user) OR (!$valid_size) OR (!$valid_ext) OR ($existing_file)))) 
       {
           return false;
       } 
       else 
       {
           if (is_uploaded_file($temp_file_name)) 
           {
               if (move_uploaded_file($temp_file_name,$upload_dir . $file_name)) 
               {
                   $log = $upload_log_dir.$y."_".$m."_".$d.".txt";
                   $fp  = fopen($log,"a+");
                   fwrite($fp,"$ip-$cpu | $file_name | $file_size | $date | $time\n");
                   fclose($fp);
                   return true;
               } 
               else 
               {
                   return false;
               }
           } 
           else 
           {
               return false;
           }
       }
    } 
}   
?>