[Resolved] Image Resize

insectis

Hey all,

I'm writing a script that allows a user to upload an image of any size, it then automatically resizes it for them to make it a good viewable size, it then resizes the original and makes another copy of thumbnail size, finally it resizes the original to make it a smaller thumbnail size. Don't ask me why, this is what the client wants... :rolleyes:

Anyway, when the script is through running, I have three new images on the server. One regular size, one thumbnail, and one smaller thumbnail. Obviously, resizing an image three times dramatically increases the amount of time the user has to sit there and wait for their image to finish uploading.

So, my question is: Is there a way to allow them to upload the original, and then resize it once it's on the server side, this way the user doesn't have to wait for it? If not, are there other ways of increasing the speed of this script? Also, is there a way with php to give the user a visual upload progress bar? I've seen this done with asp, but can't find anything with php.

Thanks in advance for your help!

insectis

Bootsman123

The image will be resized when it's uploaded, so the image will only be resized when it's on the server. But the user still has to wait a long time. You could create a cron job that creates images every day or so.

weekender

yeah, you can upload the original, save it and then use the image functions to resize the image, and save this as the thumbnails.

See image functions, particularly imagecopyresampled

in terms of an upload progress bar, the only thing i've seen is a bar that shows until the entire page is loaded, using DHTML. guess you could use that... i think it was on dhtmlcentral

weekender

just to clarify what bootsman said (and possibly correct a little), uploading doesn't resize automatically - the uploaded image will be exactly the same as the original. Resizing an image once it's on the server doesn't take much time at all - most php galleries create thumbnails on the fly, and if resizing took a long time, all php galleries would take forever. No, resizing is pretty much instant.

Bootsman123

Mmh, sorry, I stated it wrong. I meant that you can only resize the image when it's fully uploaded. 🙂

insectis

Hey, thanks a lot for your responses!

Another quick question, along the same lines. If the user hits the Stop button on the browser in the middle of the upload, the image doesn't get uploaded, all of the information they typed about the image, however, does. Is there a way to determine if the Stop button has been pressed, and then not accept any of the info?

Thanks again for your help!

weekender

if the user presses the stop button, it shouldn't matter - yes it will stop the upload process, but you won't get any half-set variables.

when a file is uploaded, it goes into the temp directory (as set in php.ini, i think). When it has finished uploading, you can check with is_uploaded_file and then move it out of the temp dir into it's destination dir.

if the user presses stop while uploading, it will remain in the temp dir, and get wiped eventually (possibly when the user session ends?). if they press stop after it has uploaded, the parsing of the copy process (or whatever code you put in) should be fast enough not to be interrupted.