I have collected many free themes from around internet. Each of them has a screenshot.jpg or png file on their folder.

I want to scan all the folders for that file, and return the full file path to be used with an img html tag. I am not interested on partial path or folders where there are not screenshots. For example, if my fodler structure is:

./a/b/
./c/d/e/screenshot.jpg
./f/
./g/screenshot.jpg
./h/i/j/k/
./l/m/screenshot.png
./n/o/
./p/screenshot.jpg

I want to get:

./c/d/e/screenshot.jpg
./g/screenshot.jpg
./l/m/screenshot.png
./p/screenshot.jpg

I managed somehow to get a recursive function, but I figured only the way to return an array and then i can't get rid of what I don't need, and I miss png.

Can anyone help me on that? the code I managed to put together is this:

function getDirectoryTree( $outerDir , $x){ 
$dirs = array_diff( scandir( $outerDir ), Array( ".", ".." ) ); 
$dir_array = Array(); 
foreach( $dirs as $d ){ 
    if( is_dir($outerDir."/".$d)  ){ 
        $dir_array[ $d ] = getDirectoryTree( $outerDir."/".$d , $x); 
    }else{ 
     if ($d==x) 
        $dir_array[ $d ] = $d; 
        } 
} 
return $dir_array; 
} 

$dirlist = getDirectoryTree('.','screenshot.jpg'); 
print_r($dirlist);