How to detect search engine bots with PHP?

mahmoud2506

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2022-05-26

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Search engine bots are also known by names such as spiders and crawlers. Their function is to go to web pages and search for links to the next pages and then go to them. Since they are crawling from one web page to another they are named crawlers. But why are they searching and visiting the next pages? Because they are trying to make a map of content that might turn out useful later when searching. Further, the problems and weaknesses of a website can be recognized by the developer this way.

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mahmoud2506

2022-05-26

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Program:

<?php 
    function detecting_bot($system) {
      if(isset($system)  &&  preg_match('/Googlebot|Twitterbot|crawl|ia_archiver|Yahoo! slurp|facebookexternalhit|Baiduspider|mediapartners/i', $system ))
        {
            echo ("detected \n");
        }
        else
        echo("not detected \n");
    }
    
    echo detecting_bot('Googlebot'); 
    echo detecting_bot('hellobot');
?>

Output:

detected
not detected

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How to detect search engine bots with PHP?

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