URL，没有扩展名的页面名称[重复]

I am trying to have my pages accessible with example.com/about, example.com/contacts instead of example.com/about.php & example.com/contact.php

I am not sure how this is done, but I was able to do it by creating link

<a href='site.com/about'> about </a>

And I have my index.php set as

$URI = $_SERVER['REQUEST_URI']; 
switch($URI){
  case '/about';
    include 'about.php';
    break; 
  case '/contact';
    include 'contact.php';
    break; 
  //...
}

Now, asking if this is a good way will have my thread closed as objective question. But I would like to know, how it is done, or more accurately, how everyone does it.

</div>

I use this in .htaccess

/blah goes to /blah.php etc. It's not slower than loading a php page, and then loading in there.

RewriteEngine On
# Redirect external .php requests to extensionless url
RewriteCond %{THE_REQUEST} ^(.+)\.php([#?][^\ ]*)?\ HTTP/
RewriteRule ^(.+)\.php$ http://WEBSITE.com/$1 [R=301,L]

# Resolve .php file for extensionless php urls
RewriteRule ^([^/.]+)$ $1.php [L]