www programming

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if ( ! empty( $_REQUEST['redirect_to'] ) ) {
      $redirect_to = $_REQUEST['redirect_to'];
    }

    if ( ( empty( $redirect_to ) || $redirect_to == admin_url() ) )
    {
      // If the user doesn't belong to a blog, send them to user admin. If the user can't edit posts, send them to their profile.
      if ( is_multisite() && !get_active_blog_for_user($user->ID) && !is_super_admin( $user->ID ) )
        $redirect_to = user_admin_url();
      elseif ( is_multisite() )
        $redirect_to = get_dashboard_url( $user->ID );
      elseif ( is_admin() )
        $redirect_to = admin_url( 'profile.php' );
     // (try) check if it is a login done via phpBB into WP iframed page AND AVOID redirect to iframe if it is the first time login, so subsequent addition of the user in WP
     // or duplicate WP insertion in wp will happen!!
     // if it is a first time login, AVOID the redirect to page-forum (if in iframe mode and user regitered then login in phpBB iframed)
     if( !isset($on_ins) && isset($_SERVER['REQUEST_URI']) && !empty($wp_w3all_forum_folder_wp) && strstr($_SERVER['REQUEST_URI'], $wp_w3all_forum_folder_wp) )
     {
      $redirect_to = home_url() . '/' . $wp_w3all_forum_folder_wp; // this will cause duplicated user insert in wp, if phpBB login first time done in phpBB iframed
      wp_redirect( $redirect_to ); exit();
     }

     if( !empty($redirect_to) ){
      wp_redirect($redirect_to); exit();
     }
    }
    // again, may $redirect_to is not emtpy
     if( !isset($on_ins) && isset($_SERVER['REQUEST_URI']) && !empty($wp_w3all_forum_folder_wp) && strstr($_SERVER['REQUEST_URI'], $wp_w3all_forum_folder_wp) )
     {
      $redirect_to = home_url() . '/' . $wp_w3all_forum_folder_wp; // this will cause duplicated user insert in wp, if phpBB login first time done in phpBB iframed
      wp_redirect( $redirect_to ); exit();
     }

  }

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wp_redirect( $redirect_to ); exit();

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wp_redirect( home_url() ); exit();