This worked for me!
To run projects like http://localhost/projectName:
<VirtualHost localhost:80>
ServerAdmin localhost
DocumentRoot path/to/htdocs/
ServerName localhost
</VirtualHost>
To run projects like http://somewebsite.com locally:
<VirtualHost somewebsite.com:80>
ServerAdmin webmaster@example.com
DocumentRoot /path/to/htdocs/somewebsiteFolder
ServerName www.somewebsite.com
ServerAlias somewebsite.com
</VirtualHost>
The same for other websites:
<VirtualHost anothersite.local:80>
ServerAdmin webmaster@example.com
DocumentRoot /path/to/htdocs/anotherSiteFolder
ServerName www.anothersite.local
ServerAlias anothersite.com
</VirtualHost>