htaccess definition for silex when using MAMP

MAMP Silex htaccess

<IfModule mod_rewrite.c>
	RewriteEngine on
	#uncomment next line if silex app root is in a mamp subdirectory
	#RewriteBase /your_mamp_htdocs_silex_app_root
	RewriteCond %{REQUEST_FILENAME} !-f
	RewriteRule ^ web/index.php [L]
</IfModule>

define your silex routes as follows:
$app->get('/your_mamp_htdocs_silex_app_root/', function() {
    return 'Hello World!';
});