404 custom file help

kazuki

I was wondering on how to create a script something like

on the 404 message.

The file ($file) you requested cannot be found on the server.

where $file is the file that cannot be found.

Anyone?

morrisoner

aye im in the same boat.

$file = $HTTP_SERVER_VARS['REQUEST_URI'];

$file = $HTTP_SERVER_VARS['HTTP_REFERER'];

the top one is better i think.

I can do that, but my server will go the 404 page, so the request_uri variable is the 404 page itself. I am thinking of using frames, but have not tried it yet?

Anyone know how to do this?
Let me know if your one works.

Pigmaster

There is a script in the Code Section here at phpbuilder.

http://www.phpbuilder.com/snippet/detail.php?type=snippet&id=47

This is a basic script that also sends the webmaster an email if a 404 happens. This helps to keep your website working.

I have modifed the script for my own purposes to also place the refering page into the 404 error message, so that

The page "www.yourdomain.com/blah.htm" is not found on this server. You followed the link from "www.yourdomain.com/badlink.htm"

It uses both $HTTP_SERVER_VARS['REQUEST_URI'] and $HTTP_SERVER_VARS['HTTP_REFERER'];

URI is the requested page,referer is the refering page.

There is also one problem when using $HTTP_SERVER_VARS['HTTP_REFERER']; and if anybody know how to fix this?

The problem is if there is no refering page (i.e. some type the page straight into the browser) you get an Undefined Prefix error which I can not get around.

raymie

use the isset function to make sure that the value is set before trying to use it.

Pigmaster

Tried that and it does not work :-(
See thread http://www.phpbuilder.com/board/showthread.php?s=&threadid=10210224

raymie

Please post the code you use here so that we can see and amend it for you.

Pigmaster

If you want to see the output from the script goto www.pigmaster.co.uk/444.htm by typing it in directly to the browser address bar. This will produce the 404 error message

The script is

<?

Set these variables to configure the script:

Set $domain to your domain name (no www)

$domain = "pigmaster.co.uk";

Set $docroot to the URL of the directory which contains your .htaccess file. Don't include trailing slash.

$docroot = "http://www.pigmaster.co.uk";

Font face you'd like to use on the 404 page

$fontface = "Verdana";

Font size you'd like to use on the 404 page

$fontsize = "2";

Background color of the 404 page (default is white)

$bgcolor = "#ffffff";

Text color you'd like to use on the 404 page (default is black)

$textcolor = "#000000";

This script is capable of mailing the details of each 404 error

to the webmaster. Use the $reportlevel variable to control when

you receive these reports.

0 = don't use the email capabilities at all

1 = send email only if the error's referer contains your domain name

(i.e. the 404 was generated by a broken link on your site)

2 = send email any time a 404 error is generated (useful for tracking

broken links at other sites which link to you)

$reportlevel = 2;

Set $emailaddress to the email address of whoever should be

notified of 404 errors. Don't escape the @ symbol. This will also

be used as the "from" address on any emails the script generates.

You can leave this unassigned if you're not using email features.

$emailaddress = "me@mydomain.com";

If you want the error message to contain a mailto: link to the

webmaster, set this variable to 1. The email address is specified

in the variable $webmasteraddress (see below).

0 = no link

1 = display link

$webmasterlink = 0;

Set $webmasteraddress to the email address you want displayed on

the error page. Don't escape the @ symbol.

$webmasteraddress = "webmaster@pigmaster.co.uk";
################################################################

DON'T EDIT BELOW THIS LINE UNLESS YOU KNOW WHAT YOU'RE DOING

################################################################

If you want to edit the script, I've commented profusely 🙂

################################################################

The print_details function is what prints the 404 error to

the visitor. As far as I know, PHP3 doesn't incorporate Perl's

print <<"EOT" ability. PHP4 does allow this capability

but the script was written for PHP3. So, you have to use

a lot of echo statements if you want to retain PHP3 compat.

function print_details()
{

Request access to the global variables we need

global $fontface, $fontsize, $docroot, $REQUEST_URI, $HTTP_REFERER, $emailaddress, $REMOTE_ADDR, $reportlevel;
global $bgcolor, $textcolor, $webmasterlink, $webmasteraddress;

Print the 404 error in web format

$REMOTE_ADDR=$SERVER['REMOTE_ADDR'];
$HTTP_REFERER=$SERVER['HTTP_REFERER'];
$REQUEST_URI=$_SERVER['REQUEST_URI'];

if (isset($HTTP_REFERER)) {
//show form
} else {
$HTTP_REFERER="";
}

echo "404 Not Found";
echo "The page you requested";
echo "".$docroot.$REQUEST_URI."";
if ($HTTP_REFERER != "")
{
echo "From the link on the page";
echo "".$HTTP_REFERER."";
}
echo "does not exist on this server.";

If webmaster shall be displayed, generate html code

$linktext = "";
$linkclose = "";
if ($webmasterlink != 0)
{
$linktext = "<a href=\"mailto:" . $webmasteraddress . "\">";
$linkclose = "</a>";
}

If an email report is being generated, let the visitor know:

if ($reportlevel != 0)
{
echo "The " . $linktext . "webmaster" . $linkclose . " ";

echo "has just been notified of this problem via email.";
echo "Thank You";
echo "Please choose a differnet link from the menu on the left or go straight to the ";
echo "<a href='index.htm'>Pigmaster Home Page</a>";
}

return;
}

The send_email function sends the details of the 404 error to the

webmaster.

function send_email()
{

Request access to the global variables we need

global $REQUEST_URI, $HTTP_REFERER, $emailaddress, $REMOTE_ADDR, $docroot;

$REMOTE_ADDR=$SERVER['REMOTE_ADDR'];
$HTTP_REFERER=$SERVER['HTTP_REFERER'];
$REQUEST_URI=$_SERVER['REQUEST_URI'];

Build the $errortime variable to contain the date/time of the error.

$errortime = date("D M j Y G:i:s T");

Create the body of the email message

$message = "404 Error Report\n\nA 404 error was encountered by ".$REMOTE_ADDR;
$message .= " on $errortime.\n\n";
$message .= "The URI which generated the error is: \n$docroot$REQUEST_URI\n\n";
$message .= "The referring page was:\n".$HTTP_REFERER."\n\n";

Send the mail message. This assumes mail() will work on your system!

mail("$emailaddress", "404 Error Report", $message, "From: $emailaddress");

return;
}

Done with function declarations. Main function begins here.

Send a 404 error to the user's browser

print_details();

See whether or not we should send an email report. If so, do it.

if ($reportlevel != 0)

if ($reportlevel == 1) {

if (eregi($domain,$HTTP_REFERER))

send_email(); }
else
send_email();

All done!

exit;

raymie

It is very difficult to read code when you post it without using the code tags, but it looks like you have misused the isset command.

what you should have done is

if(isset($_SERVER['HTTP_REFERER']))
{
   $HTTP_REFERER=$_SERVER['HTTP_REFERER']; 
}
else
{
  $HTTP_REFERER="";
}

What was suggested was that you use isset to check that the variable was set before using it.

just doing

   $HTTP_REFERER=$_SERVER['HTTP_REFERER'];

and then checking $HTTP_REFERER for being set is pointless since you just set it, checking the server variable however should correct your problem.

You should also use a similar check when using any other variable from an array when you cannot be sure that the key (or index) is there.

Pigmaster

Yes raymie you are a star!!

Works a treat as you said.

Thanks