Manage two domains pointing to one hosting with htaccess - php

Question

Well, I want to know somebody me to explain, if possible, how could I manage one hosting to have two domains pointing to it.
My purpouse is to have two folders, and manage it with htaccess.
I have two parked domains in Hostinguer, now I want to know how can I make that the htaccess only allow one folder to one domain and the other folder to another domain, and take this to all the directories, because now, I can access my webpage by the two domains and I want to know how can I solve it.
My first try was this:
RewriteEngine On
RewriteCond %{HTTP_HOST} !^(www|)\.domain\.com$ [NC]
RewriteRule ^ - [F]
I know more or less what is every thing, there is a little bit of Regex and some instructions that says how it has to works.
Let's say something like that in PHP:
if($_SERVER['SERVER_NAME'] == "www.domain.com") //There is an regex I know
exit; //Or, in this case throw a 403 error.
But, for example, I don't know how can I apply this action to all the subdirectories, avoiding this two-three lines to every .htaccess in every folder.
And also, It didn't work as I expected, because, it throw me a 403 error if I visit it from my domain.com, but also, it throw me a 403 error if I visit it from my subdomain: http://ikillnukes.hol.es/fapi (I will leave it running all the night to prove it)
Note: I don't have access to the Apache, so, don't suggest me to make an virtualhost because I can't. ;-)
EDIT:
I have now:
domain1.com, domain2.com and sub.domain1.com
And those folders:
root
domain1 //This is created by me
sub //This is automatically created by Hostinger, and I can't change the name or the path
domain2 //This is created by me
So, there is any problem by doing what #Walf suggested to me, but I have the problem of the subdomains and the .htaccess #Walf provided to me is a little bit compilcated to understand (my fault), so, what can I should try?
So, any help to me explaining how to approach this would be fantastic!
Thanks in advance!

Answer 1

Your question is probably a duplicate but I can't find one that uses adjacent dirs (as I think you're describing), nor one with a solution I'd use, myself. Try this in your root .htaccess:
RewriteEngine on
# capture the original request so you never have trouble with (un)escaping
RewriteCond %{THE_REQUEST} \S+\s+(\S*)
RewriteRule ^ - [E=REQ:%1]
# ensure the domain goes to a dir with the same name (ignoring www)
# get domain
RewriteCond %{HTTP_HOST} ^(?:www\.)?(.+)
# see if first dir in url doesn't match domain
RewriteCond %1 =!^(?>([^|]+)\|\1)$
# capture first dir (if any) to check against above conditions and pass through as new url if not prefixed with domain dir
RewriteRule ^[^/]* %1%{ENV:REQ} [NE,DPI,PT]
Your dir structure would then be
docroot/
domain1.com/
whatever
domain2.net/
whatever
.htaccess
You should then be able to have normal .htaccess directives in each subdir, if you wish. Ensure you use RewriteBase / in those dirs.
Re-edit That just makes your situation more like most others'.
RewriteEngine on
RewriteBase /
# capture the original request so you never have trouble with (un)escaping
RewriteCond %{THE_REQUEST} \S+\s+(\S*)
RewriteRule ^ - [E=REQ:%1]
# ensure the domain goes to the required dir
# get domain
RewriteCond %{HTTP_HOST} ^(?:www\.)?(.+)
RewriteRule ^ - [E=DOM:%1]
# explicitly set dir per host
RewriteCond %{ENV:DOM} =sub.domain1.com [NC]
RewriteRule !^sub/ sub%{ENV:REQ} [NE,DPI,L]
RewriteCond %{ENV:DOM} =domain2.com [NC]
RewriteRule !^d2/ d2%{ENV:REQ} [NE,DPI,L]
# allow domain1.com to proceed to root (any other rules go below)
# rules must still exclude subdirectories for other domains, e.g.:
RewriteRule ^(?!sub/|d2/)([^/]+)/([^/.]+)$ foo.php?bar=$1&baz=$2 [NE,B,L,DPI]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule !^(?:sub/|d2/|index\.php$) index.php [L,DPI]
# after all other rules, emulate DirectorySlash so that Apache does not naively insert hidden directory into public URL
DirectorySlash off
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule (?>.*)(?<!/) %{ENV:REQ}/ [L,DPI,R]
If you're unsure of any regex, paste it into regex101.com (with the g flag off) and look at the explanation.