Install apache2 + php5 + mysql in debian

Install apache2 + php5 + mysql in debian-Linux Enterprise Application-Linux server application information. For more information, see the following. The simplest is to open the desktop-system management-the new software package manager.
Installation of apache2 through dummies
Php5
Mysql-server-5.0
Php5-mysql
After installation, I tested the php connection to apache2 page.
(I forgot to install php5-mysql in advance, so there is a bunch of errors below, if you are in a hurry, the following will not have to read)
However, an error is reported when php is connected to MySQL 5:
Undefined function mysql_connect ()
Find a solution:
Remove the one before extension = mysql. so.
Restart apahce2:
# Apache2ctl restart
If bash: apache2ctl: command not found is prompted, search for the path:
# Whereis apache2ctl
Apache2ctl:/usr/sbin/apache2ctl/usr/share/man/man8/apache2ctl.8.gz

OK, add path:
# Export PATH = $ PATH:/usr/sbin
(Log On with the root user: su, input password)
# Apache2ctl restart
Apache2: cocould not reliably determine the server's fully qualified domain name, using 127.0.0.1 for ServerName
Modify/etc/apache2/apache2.conf
# Nano/etc/apache2/apache2.conf
Add a row: ServerName 127.0.0.1
# Apache2ctl restart
Httpd not running, trying to start
To the Internet idle, suddenly realized, I did not install php5-mysql module, So Ran to Suntory to install,
Run again
# Apache2ctl restart
Successful
Come back and run the php webpage connecting to mysql, success, too