Thanks all,
I have found the problem.
In apache 2.4.6 and ubuntu 13.10 we need to update apache2.conf change in
<Directory /var/www/>
Options Indexes FollowSymLinks
AllowOverride None
Require all granted
</Directory>
with
<Directory /var/www/>
Options Indexes FollowSymLinks
AllowOverride All
Require all granted
</Directory>
and create your virtual host file something like this,
<VirtualHost zfapp.com:80>
ServerName zfapp.com
DocumentRoot /var/www/zfapp/index
<Directory /var/www/zfapp/index>
Options Indexes FollowSymLinks
AllowOverride All
Require all granted
</Directory>
ErrorLog /var/log/apache2/error.log
CustomLog /var/log/apache2/access.log combined
</VirtualHost>
I have found solution from: https://askubuntu.com/questions/423514/how-to-enable-mod-rewrite-for-virtual-host
by the way, thanks @Bilal , @jmleroux