Several symfony project on one server with the same port - apache

Question

I have a trouble installing two projects on the same server. Some necessary information:
One VPS server
Two symfony projects (each in separate directory)
Subdomains pointing to projects (first.domain.com / second.domain.com)
All projects must be on the same port (80)
My server looks like this:
Root directory: /var/www/html
- index.php (welcome page)
- projecta (first project)
- projectb (second project)
I would like to achieve:
domain.com -> index.php
first.domain.com (domain.com/first) -> first project
second.domain.com (domain.com/second) -> second project
My apache config:
Alias "/first" "/var/www/html/projecta/web"
<VirtualHost *:80>
ServerName vps.net
ServerAlias http://vps.net/first
DocumentRoot /var/www/html/projecta/web
<Directory /var/www/html/projecta/web>
AllowOverride None
Order Allow,Deny
Allow from All
<IfModule mod_rewrite.c>
Options -MultiViews
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ first/app.php [QSA]
</IfModule>
</Directory>
ErrorLog /var/log/apache2/first_error.log
CustomLog /var/log/apache2/first_access.log combined
</VirtualHost>
Alias "/second" "/var/www/html/projectb/web"
<VirtualHost *:80>
ServerName vps.net
ServerAlias http://vps.net/second
DocumentRoot /var/www/html/projectb/web
<Directory /var/www/html/projectb/web>
AllowOverride None
Order Allow,Deny
Allow from All
<IfModule mod_rewrite.c>
Options -MultiViews
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ projectb/app.php [QSA]
</IfModule>
</Directory>
ErrorLog /var/log/apache2/second_error.log
CustomLog /var/log/apache2/second_access.log combined
</VirtualHost>
My problem is that first project override path to second project (if I change first project server, then second works).
Now looks like:
domain.com -> first project
domain.com/first -> first project
domain.com/second -> second project in web directory (when I click on the app.php then project run).
Solved
I solved the problem in this way (only in apache config file, I don't need any .htaccess file)
Alias "/first" "/var/www/html/projecta/web"
<VirtualHost *:80>
ServerName first.domain.com
ServerAlias *.first.domain.com
DocumentRoot /var/www/html/projecta/web
<Directory /var/www/html/projecta/web>
AllowOverride None
Order Allow,Deny
Allow from All
<IfModule mod_rewrite.c>
Options -MultiViews
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ first/app.php [QSA,L]
</IfModule>
</Directory>
ErrorLog /var/log/apache2/first_error.log
CustomLog /var/log/apache2/first_access.log combined
</VirtualHost>
Alias "/second" "/var/www/html/projectb/web"
<VirtualHost *:80>
ServerName second.domain.com
ServerAlias *.second.domain.com
DocumentRoot /var/www/html/projectb/web
<Directory /var/www/html/projectb/web>
AllowOverride None
Order Allow,Deny
Allow from All
<IfModule mod_rewrite.c>
Options -MultiViews
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ second/app.php [QSA]
</IfModule>
</Directory>
ErrorLog /var/log/apache2/second_error.log
CustomLog /var/log/apache2/second_access.log combined
</VirtualHost>
Currently alias didn't work, but for the moment it is enough.