Scheduled Task Help

[TheSupportForum]

Hi i need support with this scheduled task

rename("$logfile/$logname", "$logfile/backup/$logname" . date("d-M-Y", time()) . ".txt");;

the issue is as follows

1) original filename from $logname is log.txt
2) after rename it become tenhbyuu.txt04-Nov-2012.txt

so what im looking for is a solutions to do

2) renamed to tenhbyuu-04-Nov-2012.txt

the reason i am using a $logname is to allow users to choose log name, i am am still looking to keep

rename("$logfile/$logname", "$logfile/backup/$logname"

in place