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Thread: problem with predefined variables

problem with predefined variables

From
SG Edwards
Date:

Hi,

I am just learning PHP and have a very simple script to access data in a
predefined variable as follows:

<body>
<?php
echo "you are running the file <b>$PHP_SELF</b>.<br /><br />\n";
echo 'you are viewing this page usinig: <br /><b>', $HTTP_USER_AGENT, '</b><br
/>from the IP address ', $REMOTE_ADDR;
?>
</body>

However, the assignment does not happen, giving the command line error (PHP
Notice:  Undefined variable:  PHP_SELF in /home/s0460205/public_html/test.php
on line 10
you are running the file <b></b>.<br /><br />
you are viewing this page usinig: <br /><b>PHP Notice:  Undefined variable:
HTTP_USER_AGENT in /home/s0460205/public_html/test.php on line 11
</b><br />from the IP address PHP Notice:  Undefined variable:  REMOTE_ADDR in
/home/s0460205/public_html/test.php on line 11)

- why would this occur?

Many thanks

(I am running PHP/4.3.10)

Re: problem with predefined variables

From
Christopher Kings-Lynne
Date:
> However, the assignment does not happen, giving the command line error (PHP
> Notice:  Undefined variable:  PHP_SELF in /home/s0460205/public_html/test.php
> on line 10
> you are running the file <b></b>.<br /><br />
> you are viewing this page usinig: <br /><b>PHP Notice:  Undefined variable:
> HTTP_USER_AGENT in /home/s0460205/public_html/test.php on line 11
> </b><br />from the IP address PHP Notice:  Undefined variable:  REMOTE_ADDR in
> /home/s0460205/public_html/test.php on line 11)
>
> - why would this occur?

You have register_globals = off in your php.ini.

Try $_SERVER['PHP_SELF'] and $_SERVER['HTTP_USER_AGENT'] and
$_SERVER['REMOTE_ADDR']

And read about superglobals and register_globals in the PHP docs.

Chris