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<?php
function wp_get_referer() {
    $ref = false;
    if ( ! empty( $_REQUEST['_wp_http_referer'] ) )
        $ref = $_REQUEST['_wp_http_referer'];
    else if ( ! empty( $_SERVER['HTTP_REFERER'] ) )
        $ref = $_SERVER['HTTP_REFERER'];

    if ( $ref && $ref !== $_SERVER['REQUEST_URI'] )
        return $ref;
    return false;
}
?>

• Function Reference/wp get referer « WordPress Codex
  Description. Retrieve referer from '_wp_http_referer', HTTP referer, or current page respectively. Usage. <?php wp_get_referer() ?> Parameters. None.
  codex.wordpress.org
• WordPress › Support » why my wp_get_referer returns empty?
  Iam trying wp_get_referer, in the address localhost/myproject/#anchor but there's nothing coming from it. There's the dump of my $_SERVER variable: ...
  wordpress.org
• wp_get_referer() WordPress function reference, arguments and ...
  Retrieve referer from '_wp_http_referer' or HTTP referer. If it's the same as the current request URL, will return false.
  queryposts.com
• PHPXRef 0.7 : WordPress : Function Reference: wp_get_referer()
  Function and Method Cross Reference. wp_get_referer(). Defined at: /wp- includes/functions.php -> line 1246. Referenced 46 times: /wp-includes/ pluggable.php ...
  phpxref.ftwr.co.uk

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