regex - Generator URL Friendly SEO PHP with .htaccess -

so want create url friendly hidden variable, , this:

website.dev/en/page/detail.html (work, show content)

.htaccess file

options +followsymlinks -multiviews   rewriteengine on rewritebase /  rewriterule ^([^/]+)/([^/]+)/([^/]+)/(.*)$ index.php?lang=$1&page=$2&detail=$3 [l,qsa,nc] rewriterule ^([^/]+)/([^/]+)/(.*)$ index.php?lang=$1&page=$2 [l,qsa,nc] rewriterule ^([^/]+)/(.*)$ index.php?lang=$1 [l,qsa,nc]  

php file:

$_get['lang']); // en $_get['page']); // page $_get['detail']); // detail.html 

so, page return error status 500, show me content
http://i.stack.imgur.com/qgv5m.png

how can fix ?

you can use:

options +followsymlinks -multiviews rewriteengine on rewritebase /  # skip files , directories rewrite rules below rewritecond %{request_filename} -d [or] rewritecond %{request_filename} -f rewriterule ^ - [l]  rewriterule ^([^/]+)/([^/]+)/([^/]+)/(.+)$ index.php?lang=$1&page=$2&detail=$3 [l,qsa] rewriterule ^([^/]+)/([^/]+)/(.+)$ index.php?lang=$1&page=$2 [l,qsa] rewriterule ^([^/]+)/(.+)$ index.php?lang=$1 [l,qsa]