Help in opendir and subdirs to read files

[Francisco - São Paulo - Brazil <avs1001@xxxxxxxxxxxx>]

I have this directory structure:
cache/accountcache/0
cache/accountcache/0/1
cache/accountcache/0/2
cache/accountcache/0/3
cache/accountcache/0/4
cache/accountcache/0/5
cache/accountcache/0/6
cache/accountcache/0/7
cache/accountcache/0/8
cache/accountcache/0/9

then...
cache/accountcache/1
cache/accountcache/1/1
cache/accountcache/1/2
cache/accountcache/1/3
cache/accountcache/1/4
cache/accountcache/1/5
cache/accountcache/1/6
cache/accountcache/1/7
cache/accountcache/1/8
cache/accountcache/1/9

etc...

In each subdir I have text files with this format: XXXXX_visit_counter.dat
XXXXX = It's a number

I need, starting from the cache/accountcache, read the content of each 
text file.

Tried this but doesnt work:
    $dir = "cache/accountcache";        
    if($dh = @opendir($dir)){
        while (($obj = readdir($dh))) {
            if($obj=='.' || $obj=='..') continue;
            $sub = $dir.'/'.$obj;
            echo $sub;
        }
    }













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