About php showing different content codes to visitors and crawlers

This article mainly introduces the different contents displayed by PHP to visitors and crawlers. It has certain reference value. Now I share it with you. Friends in need can refer to it

In order to improve the user experience of the web page , we often do things that are not very friendly to search engines, but in some cases this is not irreversible and we can provide a good user experience and SEO by displaying different content to natural humans and search engine bots.

I heard that this method will violate some operating principles of search engines, and may be punished by various search engines, or even delete the website. So I have just removed this treatment until I am sure that it is not cheating. Enterprising Friends can continue to use it, but at their own risk.
The homepage and archive pages of this blog display articles in the form of a list, and the content of the article is only loaded when the visitor clicks to expand the article. Because the content of the article contains a large amount of text and pictures , requires a lot of loading time and traffic. Displaying web pages to visitors as soon as possible can retain a large number of visitors. For mobile users, loading time and traffic are more important.
Generally speaking, the homepage of the website is the search engine The pages most visited by engines should display meaningful content to them as much as possible. However, if the articles are displayed in the form of a list, visitors and search engines can only obtain the article title information. Article content or summary (especially the article's first paragraph) (sentence) is extremely important for SEO, so we have to try to send this content to the crawler.
Well, we can use the User Agent to determine whether the visitor is a crawler, and if so, display the article in a general form, Otherwise, the article list is displayed in list form. You can use the following PHP method to determine whether it is a crawler:

function is_crawler() { 
$userAgent = strtolower($_SERVER['HTTP_USER_AGENT']); 
$spiders = array( 
‘Googlebot', // Google 爬虫 
‘Baiduspider', // 百度爬虫 
‘Yahoo! Slurp', // 雅虎爬虫 
‘YodaoBot', // 有道爬虫 
‘msnbot' // Bing爬虫 
// 更多爬虫关键字 
); 
foreach ($spiders as $spider) { 
$spider = strtolower($spider); 
if (strpos($userAgent, $spider) !== false) { 
return true; 
} 
} 
return false; 
}

This is the method I use. Each crawler sorts the accessed comments from high to low. Then use the following Methods to display different content to crawlers and natural people

The above is the entire content of this article. I hope it will be helpful to everyone's learning. For more related content, please pay attention to the PHP Chinese website!

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