strtr array replace issue...

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Apache: 2.2.8 threaded
 PHP: 5.2.4-2
 mySQL: 5.051.a

 Ubuntu 8.04 minimal with everything needed installed via apt-get.

 Using SMF forum, I'm having an issue with the strtr command...  Here's
 the code...

 $ftp_file = strtr($filename, array ($_SESSION['pack_ftp']['root'] =>''));

 The $_SESSION['pack_ftp']['root'] variable is an empty set: ''

 Well, if the above strtr command was translated it would look like this:

 strtr("/home/user/public_html/Packages/temp", array ('' =>''));

 You would think that the return would be : /home/user/public_html/Packages/temp

 However, it returns '' instead.

 I can get around this by modifying the code to the site manually and
 checking to see if $_SESSION['pack_ftp']['root'] == '' and if it does
 assign it something crazy, like $_SESSION['pack_ftp']['root'] =
 '%%%%%'

 However, the code works on another site I have that's hosted for me
 (shared hosting).

 Anyone have any ideas?

 I was wondering if it was related to this: http://bugs.php.net/bug.php?id=27457
 But that seems like an old bug...

 Thanks.

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