How can developers properly access server variables like HTTP_REFERER in PHP?

To properly access server variables like HTTP_REFERER in PHP, developers can use the $_SERVER superglobal array. This array contains information about headers, paths, and script locations. To access the HTTP_REFERER variable specifically, developers can use $_SERVER['HTTP_REFERER']. 

$referer = isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : 'No referer';
echo $referer;

Keywords

PHP server variables HTTP_REFERER $_SERVER access

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