PHP 404 error page implementation code_PHP tutorial

Copy the code The code is as follows:

# Set $domain as your domain name (note there is no www)
$domain = "jb51.net";
# Set the URL, note there is no trailing underscore/
$docroot = "http://jb51.net";
# Set the font of the 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 management
# 0 = Basically No need to send a message, hey, how could we go wrong in NB
# 1 = Only send a message when the page contains your DOMAIN NAME
# 2 = Send a message even if the connection to me is disconnected, It may be a friendly site
$reportlevel = 2; //This is the safest option
$emailaddress = "webmaster@jb51.net"; //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 "oncoding coding camp 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 oncoding coding camp administrator's mailbox.";
}
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 message sent, such as time, place, 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"); //Send message
return;
}
# The following are based on the setting of the variable $reportlevel whether to send the message or not.
print_details();
# See whether or not we should send an email report. If so, do it.
if ($reportlevel != 0)
if ($reportlevel == 1) {
if (eregi($domain,$HTTP_REFERER))
send_email(); }
else
send_email();
# All done!
exit;
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