February 12, 2011 
Definition:
function wp_referer_field( $echo = true ) {}
Retrieve or display referer hidden field for forms.
The referer link is the current Request URI from the server super global. The input name is ‘_wp_http_referer’, in case you wanted to check manually.
Parameters
- bool $echo: Whether to echo or return the referer field.
Return values
returns:Referer field.
Source code
function wp_referer_field( $echo = true ) {
$ref = esc_attr( $_SERVER['REQUEST_URI'] );
$referer_field = '<input type="hidden" name="_wp_http_referer" value="'. $ref . '" />';
if ( $echo )
echo $referer_field;
return $referer_field;
}
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A HitchHackers guide through WordPress 
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