I am using a shared server where I have a plan that allows me to use 3 domains. The problem is the 2 remaining domains are subfolders in the main domain folder. I bought two scripts: the first one, which I am using in the main domain, only works with PHP 8.1, and the second, which is a subfolder in the main domain folder, only works with PHP 7.4.

Here is the main domain .htaccess:

<IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteCond %{REQUEST_URI} !^public
    RewriteRule ^(.*)$ public/$1 [L]
</IfModule>

<IfModule mime_module>
  AddHandler application/x-httpd-alt-php81___lsphp .php .php8 .phtml
</IfModule>

And here is the subfolder .htaccess:

<IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteBase /subfolderproject.ma/

    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteRule ^(.*)$ index.php/$1 [L,QSA]

    <IfModule mime_module>
      AddHandler application/x-httpd-alt-php74___lsphp .php .php7 .phtml
    </IfModule>
</IfModule>

<IfModule mime_module>
  AddHandler application/x-httpd-alt-php74___lsphp .php .php7 .phtml
</IfModule>

When I apply PHP 7.4 to the main project and thus to all subfolders, the main domain obviously doesn’t work and the subfolder project works.

When I apply PHP 8.1 to the main project and PHP 7.4 to the subfolder only, the main project works, and the second project’s index works, but when I go to any other sublink, I get a 500 error.

I hope I explained well my problem,
Thank you everyone.