gistfile1.php

<?php      
		$buildFiles = array();
		$builds = array();
		foreach ( $files as $controller => $controllerFiles ){
			
			foreach ( $controllerFiles as $file ){
				if ( !isset($buildFiles[$file]) || !is_array($buildFiles[$file]) ){
					$buildFiles[$file] = array();
				}
				$buildFiles[$file][] = $controller;
			}
			
		}

		foreach( $buildFiles as $file => $controllerArray ){
			sort($controllerArray);
			$key = implode("", $controllerArray);
			if ( !isset($builds[$key]) || !is_array($builds[$key]) ){
				$builds[$key] = array();	
			}
			$builds[$key][] = $file;
		}