#install apache
sudo apt-get install apache2

#install php
sudo apt-get install libapache2-mod-php5 php5
sudo /etc/init.d/apache2 restart
#install mysql
sudo apt-get install mysql-server libapache2-mod-auth-mysql php5-mysql
#test mysql
mysql -u root -p
#install phpmyadmin(not necessary)
#一開始會問你要不要自動幫你設定phpmyadmin，選擇yes。之後會問你mysql server中root的密碼。
#最後會問你進入phpmyadmin的密碼。
sudo apt-get install phpmyadmin

#打開/etc/apache2/apache2.conf，在最後面加上以下的code
Include /etc/phpmyadmin/apache.conf
#或者也可以用下面這個方法
sudo ln -s /usr/share/phpmyadmin /var/www

sudo a2enmod userdir
vim /etc/apache2/mods-enabled/userdir.conf
#找到下面這段，改成這樣。
<IfModule mod_userdir.c>
        UserDir public_html
        UserDir disabled root

        <Directory /home/*/public_html>
        AllowOverride All
        Options MultiViews Indexes SymLinksIfOwnerMatch
        <Limit GET POST OPTIONS>
                Order allow,deny
                Allow from all
        </Limit>
        <LimitExcept GET POST OPTIONS>
                Order deny,allow
                Deny from all
        </LimitExcept>
        </Directory>
</IfModule>

vim /etc/apache2/mods-available/php5.conf
#找到下面這段，改成這樣
<IfModule mod_php5.c>
    <FilesMatch "\.ph(p3?|tml)$">
    SetHandler application/x-httpd-php
    </FilesMatch>
    <FilesMatch "\.phps$">
    SetHandler application/x-httpd-php-source
    </FilesMatch>
    # To re-enable php in user directories comment the following lines
    # (from <IfModule ...> to </IfModule>.) Do NOT set it to On as it
    # prevents .htaccess files from disabling it.
    #<IfModule mod_userdir.c>
    #    <Directory /home/*/public_html>
    #        php_admin_value engine Off
    #    </Directory>
    #</IfModule>
</IfModule>

service apache2 restart
#之後就可以在家目錄建立public_html
mkdir /home/$USER/public_html