Running non-WordPress PHP files

To run non-WordPress PHP files in a subfolder alongside a WordPress installation, follow these steps to modify your .htaccess file:

1. Choose a Subfolder Name: Decide the name for your subfolder, e.g., mycustomphp.

2. Modify the .htaccess File: Add the following lines above the # BEGIN WordPress section to exclude your subfolder from WordPress’s URL rewriting:

   RewriteEngine On
   RewriteRule ^mycustomphp/ - [L]
   

   Ensure the entire .htaccess looks like this:

   RewriteEngine On
   RewriteRule ^mycustomphp/ - [L]
   
   # BEGIN WordPress
   <IfModule mod_rewrite.c>
   RewriteEngine On
   RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]
   RewriteBase /
   RewriteRule ^index\.php$ - [L]
   RewriteCond %{REQUEST_FILENAME} !-f
   RewriteCond %{REQUEST_FILENAME} !-d
   RewriteRule . /index.php [L]
   </IfModule>
   # END WordPress
   

This approach allows your PHP files to operate separately from the WordPress environment without altering core rewrite rules that could affect your main site.