htaccess removing php extension keeping query string

.htaccess

# http://stackoverflow.com/questions/19050516/combine-htaccess-rules-remove-extension-and-rewrite-url-variables?rq=1
Options +FollowSymLinks -Indexes -MultiViews
RewriteEngine On
RewriteBase /subdirectory

RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^([^/]+)/$ $1 [R=301,L]

RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([^/]+)/?(.*)$ $1.php?_url=$2 [L]