What are the differences between using $_SERVER['HTTP_REFERER'] and $_SERVER['REQUEST_URI'] in PHP?

$_SERVER['HTTP_REFERER'] contains the URL of the page that referred the user to the current page, while $_SERVER['REQUEST_URI'] contains the URI of the current request. If you want to track where the user is coming from, you can use $_SERVER['HTTP_REFERER']. If you want to get the URI of the current request, you can use $_SERVER['REQUEST_URI']. 

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

// Using $_SERVER['REQUEST_URI']
$currentURI = $_SERVER['REQUEST_URI'];

Keywords

$_SERVER HTTP_REFERER REQUEST_URI differences PHP

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