How do I extract files without folder structure using tar

I have a tar.gz-file with the following structure:

folder1/img.gif
folder2/img2.gif
folder3/img3.gif

I want to extract the image files without the folder hierarchy so the extracted result looks like:

/img.gif
/img2.gif
/img3.gif

I need to do this with a combination of Unix and PHP. Here is what I have so far, it works to extract them to the specified directory but keeps the folder hierarchy:

exec('gtar --keep-newer-files -xzf images.tgz -C /home/user/public_html/images/',$ret);

---

You can use the --strip-components option of tar.

 --strip-components count
         (x mode only) Remove the specified number of leading path ele-
         ments.  Pathnames with fewer elements will be silently skipped.
         Note that the pathname is edited after checking inclusion/exclu-
         sion patterns but before security checks.

I create a tar file with a similar structure to yours:

$tar -tf tarfolder.tar
tarfolder/
tarfolder/file.a
tarfolder/file.b

$ls -la file.*
ls: file.*: No such file or directory

Then extracted by doing:

$tar -xf tarfolder.tar --strip-components 1
$ls -la file.*
-rw-r--r--  1 ericgorr  wheel  0 Jan 12 12:33 file.a
-rw-r--r--  1 ericgorr  wheel  0 Jan 12 12:33 file.b

---

This is almost possible with tar alone, using the --transform flag, except that there's no way to delete the left over directories as far as I can tell.

This will flatten the entire archive:

tar xzf images.tgz --transform='s/.*///'

The output will be

folder1/
folder2/
folder3/
img.gif
img2.gif
img3.gif

You will then need to delete the directories with another command, unfortunately.

---

Check the tar version eg

$ tar --version

If version is >= than tar-1.14.90 use --strip-components

tar xvzf web.dirs.tar.gz -C /srv/www --strip-components 2

else use --strip-path

tar xvzf web.dirs.tar.gz -C /srv/www --strip-path 2

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