If you test sites in a subdirectory (e.g. http://localhost/testSite/) rather than a virtualhost, then you'll need to adjust the way you use Minify to rewrite CSS correctly.

1. Place the following in min/config.php:

// Set the document root to be the path of the "site root"
$min_documentRoot = substr(__FILE__, 0, -15);

// Set $sitePrefix to the path of the site from the webserver's real docroot
list($sitePrefix) = explode('/min/index.php', $_SERVER['SCRIPT_NAME'], 2);

// Prepend $sitePrefix to the rewritten URIs in CSS files
$min_symlinks['//' . ltrim($sitePrefix, '/')] = $min_documentRoot;

2. In the HTML, make your Minify URIs document-relative (e.g. min/f=js/file.js and ../min/f=js/file.js), not root-relative.

Now the min application should operate correctly from a subdirectory and will serve files relative to your "site" root rather than the document root. E.g.

Caveats:

• This configuration may break the Builder application (located at /min/builder/) used to create Minify URIs, but you can still create them by hand.
• Make sure you don't reset $min_symlinks to a different value lower in your config file.