Upload, rename image..etc

Anon

Hi,

here's my code for uploading an image and displaying the size. (pasted at bottom)

because I'll have many users uploading it to the same folder, how can I add an ID to each image so that no image names will ever be the same? For example, is it possible to rename an image from image.gif to image1.gif and increment the number? I guess it will involve a database ID?

If this will be hard to code, is there any simpler way to make sure that non of the images will have the same name? (I don't want to have to ask the users to make sure the file name already exists)

Also, I also like to replace characters such as space, % or invalid url characters with an underscore or just remove it.. how do I do it?

Thank you for your time!

Anon

oops, here it is:

there's another function in form to send the file name and path to file.

if ($file_name) {
if (!ereg("/$", $path_to_file))
$path_to_file = $path_to_file."/";
$location = $path_to_file.$file_name;
copy($file,$location);

$size = getimagesize($path_to_file.$file_name);

unlink($file);
$content .= "Uploaded File: ".$path_to_file.$file_name." ".$size[0]. " by " .$size[1]."\n";
}

kailien

Use the time function for your filename. Then, you will minimize the risk of duplicated filenames.

$new_filename = time();

When you copy the uploaded file from the temp directory to the specific directory, make sure you change the filename to $new_filename.

Anon

ooh. i see what you mean.. so I should change all file names to the current date and time? I'll try it and let you know if I got it to work. thanks!

Anon

Hello.

Just to clarify, time() returns the time since January 1 1970 00:00:00 GMT, so there will never be a same time from time() right? also, how sensitive is time(), meaning, if 2 users almost simultaneously upload a file, will there be a difference from the time()? like a fraction of millisecond, will it be shown?

I uploaded a file and the file name is changed to "991520944" what does that represent?

Also, what are the ways to detect whether the file uploaded was originally in jpg format or gif.. so I can add the extension to the value returned from time()?

Thanks a lot!

Anon

use <a href="http://www.php.net/manual/en/function.uniqid.php">uniqID()</a> instead of time if you really want it to be unique.

kailien

May be there is an easier way to do this, but I would check the last letter of the uploaded file to see if it is a "f" for gif or "g" for jpeg / jpg images. You could use the substr() to check the last letter.

Then, you could append the extension to the new filename.

Anon

Hi chad, could you give me an example how to use uniqid.. I read the manual but am not sure what bool lcg means and how the prefix works.. thanks

Anon

This is what I did and it worked 🙂

$filearray = explode(".",$file_name);
$extension = end($filearray);
$new_name = uniqid();

$newname = $new_name.'.'.$extension;

Anon

I guess I figrued it out.. in order not to ever worry about it..

I used

$time = time();
uniqid=("$time");

🙂 it's REALLY unique..

Anon

after I get like 1000 pics in a folder with unique names like those (15 characters)

it's gonna be painful to pick out one file that needs to be deleted...

OR, is there a smart way to do it??

Thanks!

Anon

Oh well.. I used date instead of time and shows which date the file is created.. so it's a bit easier to find..

Anon

i'm trying to do the same thing, could you please give me a code example, like all PHP

thanks a lot

Anon

This is my code:

$filearray = explode(".",$file_name); 
$extension = end($filearray);
$time = date(y_M_d).'_';
$new_name = uniqid("$time");  
$newname = $new_name.'.'.$extension;

Anon

can you give me a complete code example please, my does not seem to work ....

thanks a lot
Alexei Smirnov