search
HomeBackend DevelopmentPHP TutorialUse 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.='
';
//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~~~~!

www.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...
Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
php怎么把负数转为正整数php怎么把负数转为正整数Apr 19, 2022 pm 08:59 PM

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

php怎么实现几秒后执行一个函数php怎么实现几秒后执行一个函数Apr 24, 2022 pm 01:12 PM

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php怎么除以100保留两位小数php怎么除以100保留两位小数Apr 22, 2022 pm 06:23 PM

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

php怎么根据年月日判断是一年的第几天php怎么根据年月日判断是一年的第几天Apr 22, 2022 pm 05:02 PM

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

php怎么判断有没有小数点php怎么判断有没有小数点Apr 20, 2022 pm 08:12 PM

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

php字符串有没有下标php字符串有没有下标Apr 24, 2022 am 11:49 AM

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

php怎么替换nbsp空格符php怎么替换nbsp空格符Apr 24, 2022 pm 02:55 PM

方法:1、用“str_replace("&nbsp;","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\&nbsp\;||\xc2\xa0)/","其他字符",$str)”语句。

php怎么读取字符串后几个字符php怎么读取字符串后几个字符Apr 22, 2022 pm 08:31 PM

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
2 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
Repo: How To Revive Teammates
1 months agoBy尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island Adventure: How To Get Giant Seeds
4 weeks agoBy尊渡假赌尊渡假赌尊渡假赌

Hot Tools

mPDF

mPDF

mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

SublimeText3 Linux new version

SublimeText3 Linux new version

SublimeText3 Linux latest version

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

PhpStorm Mac version

PhpStorm Mac version

The latest (2018.2.1) professional PHP integrated development tool

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools