The read_dir function from File::Slurp is also handy for getting a listing of directory entries. It filters out the special 'dot' directories by default.

Also, perltidy is handy for indenting your code.

use strict;
use warnings;
use File::Slurp;

my @dirs            = ('./');
my $directory_count = 0;
my $file_count      = 0;
my $outfile         = 'log.txt';

open my $fh, '>', $outfile or die "can't create logfile; $!";
for my $dir (@dirs) {
    for my $file (read_dir($dir)) {
        if ( -f "$dir/$file" ) {
            $directory_count++;
        }
        else {
            $file_count++;
        }
    }
    print $fh "Directories: $directory_count\n";
    print $fh "Files: $file_count\n";
}
close $fh;
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