I removed my .php extension from the url, but this only works on localhost

Selected answers from the Dumb SEO Questions Facebook & G+ community.

• 
  Jim Munro: Hi ;João, you are welcome here. :)
  
  I am not an expert and hopefully someone skilled will pick this up but one thing you might verify in the meantime is whether the mod_rewrite module is installed on the remote server.
  
  Also, your .htaccess files , are they the same on both servers?
• 
  William Gomes: Bom Dia +João Soares ;es Tuga?
  
  Your rule should look something like this right?
  RewriteCond %{REQUEST_FILENAME}.php -f
  RewriteRule !.*.php$ %{REQUEST_FILENAME}.php [L, QSA]
  
  Also is mod_rewrite turned on, on your remote server? Thats probably the problem.
• 
  Matthew Stuart: Read this...
  
  http://coding.smashingmagazine.com/2011/11/02/introduction-to-url-rewriting/
  
  I think the php needs to be there unless you have got a .htaccess file with mod rewrite activated, so the above link should help you. However, I have followed this a few times, and not once did I manage to get it to work... and in a few instances, I actually shut my website down :D but you just remove the .htaccess file to bring it back.
  
  Best of luck if you're trying this for the first time, it has been my nemesis for years!
• 
  João Soares: +Jim Munro ;
  Yes, the .htaccess it's the same on local and remote server
  probably it's the mod_rewrite on remote server
• 
  João Soares: +William Gomes ;Sim sou :)
  o meu .htaccess está assim:
  
  RewriteEngine on ;
  RewriteCond %{REQUEST_FILENAME} !-d ;
  RewriteCond %{REQUEST_FILENAME}.php -f ;
  RewriteRule ^(.*)$ $1.php
  
  Em servidor local funciona optimamente, no servidor remoto se procurar por exemplo:
  
  www.hi.com/hi ;
  
  Dá erro, diz que o ficheiro hi.php não está no servidor, no entanto ele está lá
• 
  João Soares: +Matthew Stuart ;Thanks for your answer, yes, i'm trying this for the first time.
  Probably it's the mod_rewrite tha's disabled on remote server but I'll check your post.
  Thanks
• 
  W.E. Jonk: From the expert panel in this weeks SEO Questions hangout on air on 04:00:00 into the YouTube video: https://dumbseoquestions.com/q/i_removed_my_php_extension_from_the_url_but_this_only_works_on_localhost