How can PHP be used to extract search keywords from referral URLs?

To extract search keywords from referral URLs in PHP, you can use regular expressions to match and extract the relevant information. By looking for patterns typically found in search engine URLs, such as "q=" for Google or "query=" for Bing, you can isolate the search keywords. Once extracted, you can then process and use these keywords in your application. 

$url = $_SERVER['HTTP_REFERER']; // Get the referral URL

if (preg_match('/[?&](q|query)=([^&]+)/', $url, $matches)) {
    $searchKeywords = urldecode($matches[2]); // Extract the search keywords
    echo "Search keywords: " . $searchKeywords;
} else {
    echo "No search keywords found in the referral URL.";
}

Keywords

PHP URL parsing Regular expressions $_SERVER Referral URLs

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