Use PHP to rewrite the 404 error page to make your page more user-friendly_PHP Tutorial

404 error, many people know that if the URL to be accessed does not exist, the page will be read and displayed. In the past, our usual approach to dealing with 404 was to simply write a few lines of text, and interested people may also do a little bit of it. To beautify, a small number of guys who want to be opportunistic even use meta tags to do delayed redirection. That's it. In fact, 404 can also help us do a lot of things. This is the focus of what we are going to discuss today.

First of all, let me explain what my 404 can do for me:
1. It can tell me when a user from where to access my URL failed.
2. He can tell me why the other party wants to visit this URL and help me optimize the website
3. He can tell me the other party’s IP address
4. He can tell me what the person’s intentions are
5 .I can ask him to shut up what he doesn’t want to tell me
6. He can email me what he wants to tell me
7. He can help me make a 301 permanent redirect.
8. He can tell me that someone is trying to hack into my website or host

It sounds very mysterious and cool, okay, let’s discuss how he does it next . Analyze one by one :
1. We can use PHP to capture the user's source URL and current URL, so we can do the first point very easily.
2. Because of the source URL, So you can intuitively guess the user's intention. Let me give you an example, just like my website http://www.jb51.net, if the source URL of a user is http://www.jb51. net, and the current URL captured is http://www.jb51.net/user.php?id=1. This means that when this person browses my website, the result will be when he clicks on someone's profile page. An error occurred because the information of this person cannot be found. It means: the product with ID=1 may not exist and has been deleted. Then you need to check whether there is still a hyperlink to this URL on the website. If so, Find a way to delete it!
3. This function is relatively simple. You only need to use PHP to capture the other party’s IP. Then you can use the IP to physical address function of other websites to know where the person is from. Where is it.
4. This function is very good and very powerful. Because my website www.7di.net is a server configured by myself, I have to handle the security aspects by myself, and there are often some unscrupulous guys who do harm to others. are interested in the server, they will use programs to try various methods to enter the server, and at this time you will find that you receive a large number of 404 errors in a short period of time, and the source URL is empty. The URLs they want to access are all It is a very sensitive URL. All you need to do at this time is to open your firewall settings and block the IP cleanly. I have blocked dozens of IPs using this method recently. It is really a small amount of effort that makes a big difference! Forgot Having said that, the IP of the Ministry of Information Industry has also been blocked by me. My server is in Taiwan, why are you trying to verify it? Really~~!
5. To be honest, this plug-in bothered me very much at the beginning, because Thanks to him, I receive hundreds of emails every day, some of which are caused by users browsing normally, some of which are caused by various search engines collecting content, and some of which are caused by bad guys who want to invade. In short, I don’t tire of it. Later, I made a slight change and added the verification if the extension meets the conditions or the IP meets the conditions. As long as these meet the conditions, there is no need to send an email, which is much more refreshing.
6. All of this cannot be separated from PHP instant sending For the Email function, my approach is to modify PHP.INI to implement PHP internal mail function sending. Of course, you can also use other methods, such as installing sendmail or developing a mail class to send using third-party smtp. As long as As long as you feel comfortable (the specific details are not the scope of today's discussion).
7. Since this page can be accessed, it means that the URL visited by the user does not exist, so we need to guide the user to access the correct URL. So since you are guiding users to access the correct URL, you may say that just using a meta tag or a JS delay is enough. Why bother with a 301 redirect? Because I don’t want search engines to think I am cheating! Answered.
8. I have already explained this point above. Basically, the judgment of the little one should be based on your experience and familiarity with your own website. What’s more, you need to have a general understanding of your website. Which URLs have been backlinked by other websites (experience, it can’t be achieved overnight).

That’s all that needs to be said and what needs to be posted. The fun is about to start next. Save the code below. 404.php, and then use apache or nginx to point your 404 error page here.

Copy the code The code is as follows:

#Set URL, note there is no trailing underscore/
$MyURL = (isSet($_SERVER['HTTP_HOST'])) ? Str_iReplace('http://' ,'',StrToLower(rTrim($_SERVER['HTTP_HOST'],'/'))) : 'www.7di.net';
#Set the URL, note that there is no trailing underscore/
$MyDomain = (isSet($_SERVER['HTTP_HOST'])) ? 'http://'.Str_iReplace('http://','',StrToLower(rTrim($_SERVER['HTTP_HOST'],'/'))) : 'http://www.jb51.net';
//Set the time zone. Mainly used to correct the 8-hour time difference
Date_Default_Timezone_Set('Etc/GMT-8');
//Output header
Header('Content-type:text/html; charset=utf-8');
/**
Send email
Parameters:
Recipient, email title (no line breaks), email content (lines must be separated by n, each line cannot exceed 70 characters)
Description:
Call the PHP built-in function Mail to send an email
Return:
Return a Boolean value
Usage:
$IsSend=Fun::Mail2($email,$tit,$msg);
/**/
Function Mail2($to,$tit,$msg) {
IF(Filter_var($to,FILTER_VALIDATE_EMAIL)==''){
throw new Exception('Wrong email address!');
}
$tit='=?UTF-8? B?'.Base64_Encode($tit).'?=';
$msg = str_replace("n.","n..",$msg); //If Windows finds a period at the beginning of a line, it will be deleted. To avoid this problem, replace a single period with two periods
Return Mail($to,$tit,$msg,'From:see7di@gmail.com'."n".'Content-Type: text/html;charset=utf-8');
}
$msg='

';
$msg.=(isSet($_SERVER[ 'REMOTE_ADDR'])) ? "Visitor IP is:
{$_SERVER['REMOTE_ADDR']}
" : '';
$msg.="< ;b>Visit time:
".date('Y-m-d H:i:s',time()).'

';
$msg. =(isSet($_SERVER['REMOTE_HOST'])) ? "{$_SERVER['REMOTE_HOST']}

" : '
';
$msg.=(isSet($_SERVER ['HTTP_USER_AGENT'])) ? "Visitor details:
{$_SERVER['HTTP_USER_AGENT']}

" : '';
$msg.=(isSet($_SERVER['REQUEST_URI'])) ? "The page you want to visit is:
{$MyDomain}{$_SERVER['REQUEST_URI' ]}

" : '';
$msg.=(isSet($_SERVER['HTTP_REFERER']) And Trim($_SERVER['HTTP_REFERER'])!='') ? "The source address is:
{$_SERVER['HTTP_REFERER']}

" : '';
$msg.='< /td>

';
//Which types of URLs do not send emails? If these are not blocked, it will annoy me to death
$arr=Array('mp3', 'rm','swf','jpg','gif');
//Which IPs do not send emails, these are basically search engine spiders
$arrIP=Array('66.249.77.217', '66.249.74.67');
//The extension to be accessed
$needEx=Explode('.',StrToLower(Trim($_SERVER['REQUEST_URI'])));
$needEx= end($needEx);
IF(!In_Array($needEx,$arr) And !In_Array(Trim($_SERVER['REMOTE_ADDR']),$arrIP)) {
Mail2('see7di@gmail. com','404 error from ['.$MyURL.']!',$msg);
}
unSet($MyURL,$msg,$needEx,$arr);
Header( 'HTTP/1.1 301 Moved Permanently');
Header ("Location:{$MyDomain}");
Die();

Note: If you feel that the above code If the implemented function still cannot satisfy your desires, then I encourage you to rewrite it, improve it, and strengthen it. I will never object, but please share your work with me, thank you~~~~!

http://www.bkjia.com/PHPjc/326532.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/326532.htmlTechArticle404 error. Many people know that if the URL to be accessed does not exist, this page will be read and displayed. In the past, our usual approach to handling 404 was to simply write a few lines, and those who are interested...