The cookbook/File::Basename is definitely the way to go. The other two (including the PHP one) have bugs. Well, the same bug: you're lower-casing the extention, which means you're going to end up with a different extention than the original file. That'll make it quite painful to put the filename parts back together again to reach the original file.

"txt" ne "TxT"

If you need the lowercased version of the extention, for example in trying to guess at the mime type, you should do that outside of a function of "extention". Perhaps in the function named "guess_mimetype" it would make sense.

In reply to Re: Rewrite a PHP fileExtension function by Tanktalus
in thread Rewrite a PHP fileExtension function by ghenry

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.