mod_rewrite for front controller

.htaccess

<IfModule mod_rewrite.c>
  RewriteEngine On
  RewriteBase /

  # skip existent files
  RewriteCond %{REQUEST_FILENAME} -f
  RewriteRule index.php - [QSA,L,C]
  RewriteRule .* - [QSA,L]

  # deny access php files
  RewriteCond %{REQUEST_URI} ^.*\.php$
  RewriteRule ^.*\.php$ - [R=404,L]

  # asset
  RewriteCond %{REQUEST_URI} ^asset/*$
  RewriteRule ^asset/*$ - [QSA,L]

  # redirect root access (/) to index.php
  RewriteCond %{REQUEST_URI} ^/$
  RewriteRule ^$ index.php [QSA,L]

  # redirect 404 for non existent files
  RewriteCond %{REQUEST_URI} ^(.*)\..*$
  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteRule ^(.*)\..*$ - [R=404,L]
  
  # no, so we redirect to our front web controller
  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteRule ^(.*)$ index.php [QSA,L]
</IfModule>