How about this low-tech solution? Since the rootdir is at the start of the string... 
substr($files[$i], 0, length($conf{rootdir})+1) = '';

[download]
buckaduck

UPDATE: I added 1 to the length to deal with the extra forward slash character...

In reply to Re: (tye)Re: Cutting of Path by buckaduck
in thread Cutting of Path by HTTP-404

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