If isset Referer PHP

Source

CODE

If isset REFERER

HTTP_REFERER

Code source

<?php
if (isset($_SERVER['HTTP_REFERER'])) { 
echo '<div class="alert alert-success"> <strong>REFERER  ISSET!</strong> - '.$_SERVER['HTTP_REFERER'].'</div>'; 
}
?>

If empty REFERER

HTTP_REFERER

Code source

<?php
if (empty($_SERVER['HTTP_REFERER'])) { 
echo '<div class="alert alert-danger"> <strong>REFERER IS EMPTY!</strong> - Pas de référent.</div>'; 
}
?>