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The database contains one table, ?file_manager? that manages file information.
The sql statement for creating the table:
CREATE TABLE file_manager (file_name varchar(50) default NULL, file_type varchar(20) NOT NULL default '', file_size
varchar(20) NOT NULL default '', file_modified varchar(20) NOT NULL default '', file_parent_id mediumint(9) default
NULL, file_image_name varchar(50) default NULL,
KEY file_name (file_name), KEY file_image_name (file_image_name)) TYPE=MyISAM;
File Management:
I?ve written two programs to manage this file version. The first to upload the file (file_upload_manager.php), the second is
to display the file (file_display_manager.php). The source code is tested on a Windows system.
Note: Linux users, please change the folder path accordingly.
File Upload Manager:
This program displays a menu to select the file in your system, a check box and an Upload button.
Once the user clicks the upload button, the program checks the file for existence, and undergoes a series of tests as
described in the plan.
Now let?s look upon the code snippets used in the program.
$dir_path Variable:
This variable is the destination folder path.
$dir_path= "C:apachehtdocsfilemanager";
This path is given for Windows-based systems. Please change your destination folder accordingly.
Get_New_File_Name() Function:
This function is called from the main program when the program encounters file exists and difference in size, date or
time. This function will generate a new file name and return to the main function.
function Get_New_FIle_Name($file_name){
$sqlQuery="SELECT file_image_name FROM file_manager WHERE file_name LIKE '$file_name%' AND http://www.devarticles.com - Dev Articles Powered by Mambo Open Source Generated: 4 March, 2008, 11:17
file_parent_id=1";
$fResult=mysql_query($sqlQuery); $Last_Version=0; $ver=0;
if(mysql_num_rows($fResult)){ while($fRow=mysql_fetch_array($fResult)){
list($junk,$ver)=explode("_VERSION",$fRow['file_image_name']); list($ver,$extn)=explode(".",$ver); $Last_Version =
$Last_Version > $ver ? $Last_Version : $ver; } }else{ $new_file_name =$file_name."_VERSION".++$Last_Version;
return $new_file_name; }
if($Last_Version !=0){ $new_file_name=$file_name."_VERSION".++$Last_Version; return $new_file_name; }}
The sql query in the beginning of the function will fetch file names of previous versions.
If the sql query returns record sets, it means the file has previous versions. The while loop is executed to store the
generated version number, and the value obtained is stored in $Last_Version. Otherwise, the new file name will be
generated as file-name_VERSION1.
The next if statement checks for $Last_Version != 0, if true, $Last_Version is incremented by 1 and a new file name is
assigned.
The return statement will return a new file name generated to the called statement.
File_Size() Function:
This function returns the file size in terms of Bytes, Kb or Mb.
<?function File_Size($size){ if($size > 104876){ return $return_size=sprintf("%01.2f",$size / 104876)." Mb"; }elseif($size
> 1024){ return $return_size=sprintf("%01.2f",$size / 1024)." Kb"; }else{ return $return_size=$size." Bytes"; }
}?>
Display_form() Function:
This function is used to prompt the user to select the file from your local machine.
<?function display_form($errMsg){ global $dir_path;
?><html><head><title>File Manager</title></head><body bgcolor="#E5E5E5"><div align="center"><h4>File
Manager</h4>
<? if($errMsg){?><font face="verdana, helvetica" size="2" color="red"><? echo $errMsg ?></font><?} ?><form
action="<? echo $PHP_SELF; ?>" enctype="multipart/form-data" method="POST"><table border="1"><tr><th>File
Location:</th><th><input type="file" name="up_file" /></th></tr><tr><th colspan="2"><br><input type="checkbox"
name="replace" value="1">Replace Exiting File*</th></tr><tr><th colspan="2"><br><input type="submit" name="upload"
value="Upload File !" /></th></tr></table>
<br>* - Clicking this option will replace the existing file<br><a href="file_display_manager.php">File Manager</a>
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