Create a 404 error page and send it to the administrator

# Set $domain to your domain name (note there is no www)
$domain = "oso.com.cn";
# Set URL, note there is no trailing underscore /
$docroot = "http://www.oso.com.cn";
# Set the font of error message
$fontface = "Verdana";
# Set the font size of the 404 page
$fontsize = "2";
# Set the background color of the 404 page, the default is white
$bgcolor = "#ffffff";
# Set the text color, the default is black
$textcolor = "#000000";

# Use the $reportlevel variable to control whether to send a letter to the network administrator
# 0 = No need to send a message at all, hey, how could teaman go wrong
# 1 = Only send emails if the page contains your DOMAIN NAME
# 2 = Send messages even if the connection with me is disconnected, it may be a friendly site
$reportlevel = 2; //This is the safest

$emailaddress = "webmaster@oso.com.cn"; //Set the email address for receiving error messages


function PRint_details()
{
# Request access to the global variables we need
global $fontface, $fontsize, $docroot, $REQUEST_URI, $reportlevel;
global $bgcolor, $textcolor;

# Print the 404 error in web format
echo "";
echo "";
echo "

404 Sorry, I did not find the page you requested

";
echo "

";
echo "Oso Network Administrator reminds you that the page you requested, $docroot$REQUEST_URI, doesn't exist";
echo " on this server.

";

if ($reportlevel != 0)
{
echo "

";
echo "The error message has been sent to the Oso network administrator.";
}

Return;
}


#EMAIL processing function

function send_email()
{
# Request access to the global variables we need
global $REQUEST_URI, $HTTP_REFERER, $emailaddress, $REMOTE_ADDR, $docroot;

# Customize the messages sent, such as time and location, etc.
$today = getdate();
$month = $today[mon];
$mday = $today[mday];
$year = $today[year];
$hours = $today[hours];
$minutes = $today[minutes];
$errortime = "$month/$mday/$year at $hours:$minutes";

#Create the body of the email message
$message .= "404 Error ReportnnA 404 error was encountered by $REMOTE_ADDR";
$message .= " on $errortime.nn";
$message .= "The URI which generated the error is: n$docroot$REQUEST_URInn";
$message .= "The referring page was:n$HTTP_REFERERnn";

# Send the mail message. This assumes mail() will work on your system!
Mail("$emailaddress", "404 Error Report", $message, "From: $emailaddress"); //Okay, send the letter
​
Return;
}


# The following are based on the setting of the variable $reportlevel to send or not.
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;

?>

The above introduces how to create a 404 error page and send a letter to the administrator, including the relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.