Htaccess Directs to Online When I Want to Work On Localhost - .htaccess

Question

I changed my localhost server Apache to XAMPP. After then, my project has started to go to online site yusufcode.com(my website link) while I want to work on localhost. Where is the problem? This was the first question.
My second question is my links not works without .php extension on localhost.
Htaccess:
RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}.php -f
RewriteRule ^(.*)$ $1.php
RewriteRule ^([a-z]+)\/?$ $1.php [NC]
RewriteCond %{SERVER_PORT} 80
RewriteRule ^(.*)$ https://www.yusufcode.com/$1 [R,L]

Answer 1

Oh... I found the problem. The problem is the localhost port number.
I changed the port number from:
RewriteCond %{SERVER_PORT} 80
To this:
RewriteCond %{SERVER_PORT} 443
And all problems has solved. Thanks stackoverflow again. This platform helps me always, even nobody not answered :)

Answer 2

You should write it like this instead:
Options -MultiViews
RewriteEngine on
# Redirect to HTTPS (and www) but only on "live" site
RewriteCond %{HTTP_HOST} !^www\. [OR]
RewriteCond %{SERVER_PORT} 80
RewriteCond %{HTTP_HOST} ^(?:www\.)?(yusufcode\.com) [NC]
RewriteRule (.*) https://www.%1/$1 [R=301,L]
# Handle extensionless .php files
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{DOCUMENT_ROOT}/$1.php -f
RewriteRule (.*) $1.php [L]
There were a number of issues with your original directives that handled the PHP-extensionless URLs... the second RewriteRule ran unconditionally. The file check was potentially testing a different file that the one being requested.
UPDATE: This of course does assume that .htaccess overrides are enabled in the server config on your local Apache server. This is not the default on Apache 2.4. .htaccess overrides are enabled with the AllowOverride directive.
For example, somewhere in your server config you need something like this:
<Directory /path/to/document-root/>
# Allow access
Require all granted
# Allow all htaccess overrides
AllowOverride All
</Directory>
The default is AllowOverride None.