Hi windjammer, the docs from File::Path say:

       mkpath( $dir )
       mkpath( $dir, $verbose, $mode )
       mkpath( [$dir1, $dir2,...], $verbose, $mode )
       mkpath( $dir1, $dir2,..., \%opt )
           The mkpath() function provide the legacy interface of make_
+path()
           with a different interpretation of the arguments passed.  T
+he
           behaviour and return value of the function is otherwise ide
+ntical
           to make_path().
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So it rather seems that the only problem that could be solved by changing:

use File::Path qw/ make_path /;
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to

use File::Path qw/ mkpath /;
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is that your code called make_path() with deprecated argument-passing syntax, and you upgraded from an older version of File::Path to a newer one in which the make_path() syntax has changed and mkpath() offered as a legacy alternative.

So I am guessing that when you upgraded your PHP version, you may have also upgraded your Perl libraries ... did you use a shared host's one-button upgrade tool or something similar? If so, did it say that it was going to upgrade your Perl, too?

Just a theory, but I found the fact that you fixed your problem by only changing the File::Path method used, to be quite interesting.