add/read a subdirectory

Hello
I would like to know how to add and read from a subdirectory on the second code?

$row['Bloom_Name']=strtoupper($row['Bloom_Name'][0]) . '/' . $row['Bloom_Name'];

src="http://www.mysite/SEArchive/'.substr($results[$x][0],0,1).'/'.$results[$x][0].'.jpg">

You can't perform operations such as adding a directory to a URL... imagine the pandemonium as we could access any web address anywhere in the world and make changes at will. You must use the file system of your web server to make file system changes.

(I think that's what you were asking)