wp_get_raw_referer example

function wp_get_referer() {
    // Return early if called before wp_validate_redirect() is defined.     if ( ! function_exists( 'wp_validate_redirect' ) ) {
        return false;
    }

    $ref = wp_get_raw_referer();

    if ( $ref && wp_unslash( $_SERVER['REQUEST_URI'] ) !== $ref
        && home_url() . wp_unslash( $_SERVER['REQUEST_URI'] ) !== $ref
    ) {
        return wp_validate_redirect( $ref, false );
    }

    return false;
}

/** * Retrieves unvalidated referer from the '_wp_http_referer' URL query variable or the HTTP referer. * * If the value of the '_wp_http_referer' URL query variable is not a string then it will be ignored. * * Do not use for redirects, use wp_get_referer() instead. * * @since 4.5.0 * * @return string|false Referer URL on success, false on failure. */