set up apache virtualhosts on linux ubuntu

        When you installed packege apache2, php5, php5-mysql, mysql-server, mysql-client, phymyadmin successful you can do follow

step 1. Firstly you must create virtualhost directory at other that you want.
such as /home/redcrow/workspace/atstand

step 2. Go to /etc/  then edit file name's hosts 
(add ip address and hostname that you want) such as
i'am add ip address 127.0.0.1(reference own computer) and host name's atstand.dear.dev(URL website)

step 3. Go to /etc/apache2/site-available/
and copy file name's default  and paste
then rename file that you want(but extension must as .conf)
such as atstand.dear.dev.conf

edit it following
        ServerAdmin is contact email of administrator
        ServerName is hostname or URL that you want.
        ServerAlias is second name of URL
        DocumentRoot is virtualhost directory that you create in step 1.

then save

step 4. at /etc/apache2/site-available/
 type the following command for enable virtualhost

$a2ensite atstand.dear.dev.conf

you will see atstand.dear.dev.conf  into /etc/apache2/site-enable

step 5. restart web server(apache2) by use following command

$sudo service apache2 restart

step 6. testing
open firefox then put URL(atstand.dear.dev)
you will see result(i use php frameworks name's yii framework)