Replace Spaces with Underscores in Uploaded File

Question

I have a basic script that allows my site members to upload short samples of their compositions for customers to listen to.

Some file names have spaces which obvi

Answer 1

$filename = str_replace(' ', '-', trim(addslashes($_FILES['userfile']['name'])));

Why addslashes though? This also seems a little too simple -- am I missing something?

Answer 2

try;

$filename = trim(str_replace(" ","_", $_FILES['userfile']['name']));

Answer 3

After this line:

$filename = trim(addslashes($_FILES['userfile']['name']));

Write:

$filename = str_replace(' ', '_', $filename);

A filename like hello  world.mp3 (two spaces) would come out as hello__world.mp3 (two underscores), to avoid this you could do this instead:

$filename = preg_replace('/\s+/', '_', $filename);