Combine arrays based on array values PHP

Here sample arrays: $array = (); $array[] = array( 'filename' => 'File 1' 'folders' => array('Folder 1', 'Folder 2', 'Folder 3') ); $array[] = array( 'filename' => 'File 2' 'folders' => array('Folder 1', 'Folder 2') ); $array[] = array( 'filename' => 'File 3' 'folders' => array('Folder 1', 'Folder 2', 'Folder 3') ); $array[] = array( 'filename' => 'File 4' 'folders' => array() ); $array[] = array( 'filename' => 'File 5' 'folders' => array('Folder 1') ); $array[] = array( 'filename' => 'File 6' 'folders' => array('Folder 1') ); When we combine arrays, it should display array according to "folders". (Notice that, last array file is not in the folder ) So, desired output should be array version of this: Root - File 4 - Folder 1 -- File 5 -- File 6 -- Folder 2 --- File 2 --- Folder 3 ---- File 1 ---- File 3 .. etc.. Thank you.