wondering what/how image upload works

[haskinsj87]

im uploading image files to a directory like this:

move_uploaded_file($_FILES['image_file']['tmp_name'],$upload_dir . $act_id . ".jpg");

my image upload is working fine. i havnt done anything yet to test what type of file or only allow certain file types. well, i tested uploading a .gif image and it saved it as a .jpg, i put in the full url in my browser and there it was as .jpg. im wondering, is the code above re-saving as a .jpg image? should i still add to it to make it only accept certain types of files, then save them as that filetype? or is this going to work? thanks for the tips

[lemmin]

You are concatinating ".jpg" onto the uploaded file right in that line.

[Fadion]

U could post some more code to see it. $_FILES['image_file']['name'] already has the extension, if thats where ure getting the filename. If u need to modify it, try this simple method:

 

<?php
$filename = explode('.', $_FILES['image_file']['name']);
$file = $filename[0];
$ext = $filename[1];
$newFilename = $file . '-uploaded' . $ext;
?>

 

If u have the original filename 'myfile.gif', it will make it 'myfile-uploaded.gif'. The $ext variable can be used also to check the filetype. For size limiting, use $_FILES['image_file']['size'].