Try this one (if index.php is in the root folder http://gestor.samfbas.com.br/index.php):
Options +FollowSymLinks
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} !=/index.php
RewriteRule ^(.*)$ index.php?p=$1 [L,QSA]
This should work. Testet it here on my local maschine (No other server redirects or else, just a fresh xampp installation).
It redirect http://gestor.samfbas.com.br/something to http://gestor.samfbas.com.br/index.php?p=something without changing the url in the browser.
And additional to the question in the comment.
This URL part p= should not be known be outside users!
Better use a long var here like sadff34dngn4nil212ugn=, so nobody can call the index.php with parameters directly from outside. You can't prevent that 100% but the redirect parameter p= is only for internal use.
But its just my opinion on that.
Hopefully that helps a little.
Find the right way to rome ;)
my url is? Did you put that on your html page? And thishttp://gestor.samfbas.com.br/index.php?p=somethingwill not redirected because the conditionRewriteCond %{REQUEST_FILENAME} !-ffails here, and thishttp://gestor.samfbas.com.br/somethingseems to be workingOptions +Indexes