What is the purpose of using $_SERVER["HTTP_REFERER"] in PHP?

The purpose of using $_SERVER["HTTP_REFERER"] in PHP is to retrieve the URL of the previous page that linked to the current page. This information can be useful for tracking user navigation, implementing security measures, or customizing the user experience based on the referring page. 

if(isset($_SERVER["HTTP_REFERER"])) {
    $referer = $_SERVER["HTTP_REFERER"];
    // Do something with the referer URL
} else {
    // Handle the case when there is no referer information
}

Keywords

$_SERVER HTTP_REFERER PHP web development HTTP headers

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