Please go through the HTML Example before doing this example.

Create a sample php file

1. Go to the examples sub-directory of your web development directory and list the contents of the directory that end in .php:

   [username@l-lnx101 username]$ cd /webdev/user/username/examples
[username@l-lnx101 examples]$ ls *.php
sample_mysql.php  sample_psql.php

2. There are two scripts which are example of using php to connect to a mysql database and a postgresql database. You can edit/view them with nano by typing nano sample_mysql.php or nano sample_psql.php.
3. Using nano, we can create tutorial.php:

   [username@l-lnx101 examples]$ nano tutorial.php

4. Copy and paste the following code into your nano screen:

   <?php
$ip=$_SERVER["REMOTE_ADDR"];
print "REMOTE_ADDR is $ip";
$userhost= gethostbyaddr($_SERVER["REMOTE_ADDR"]);
print "<br>\n";
print "Lookup of $ip is <strong>$userhost</strong>\n";
?>

5. Save the file and go to http://webdev.cs.uiowa.edu/~username/examples/tutorial.php where username is replaced with your divmsid.
6. The page when viewed on l-lnx100 in the lab looks like:

   REMOTE_ADDR is 128.255.44.124
Lookup of 128.255.44.124 is l-lnx100.divms.uiowa.edu