Detect mod-rewrite also, when PHP is installed as CGI

When PHP is installed as CGI and not as "mod_php" into Apache, then system requirements step tells, that mod rewrite is not available.
But in fact mod rewrite works absolutely normally.

I propose to improve detection as advised by [url]http://christian.roy.name/blog/detecting-modrewrite-using-php[/url] article by setting custom environment variable in .htaccess file, like this:

<IfModule mod_rewrite.c>
// Tell PHP that the mod_rewrite module is ENABLED.
SetEnv HTTP_MOD_REWRITE On
</IfModule>

and checking it later inside PHP:

if ( function_exists('apache_get_modules') )

{ $modules = apache_get_modules(); $mod_rewrite = in_array('mod_rewrite', $modules); }

else

{ $mod_rewrite = getenv('HTTP_MOD_REWRITE')=='On' ? true : false; }

I also recommend wrapping whole rewrite-related code inside that IfModule statement since if mod-rewrite is really unavailable, then any directive from it (e.g. RewriteEngine) could cause "500 Internal Server Error" for whole website.