Random thoughts about using namespacing for the HTML helper in Yiistrap.

yiistrap-namespacing.php

<?php

/* Core implementation */

// Helper

namespace bootstrap\helpers;

class Html extends \CHtml {
    public static function someStaticHelperMethod() {
        // core implementation
    }    
}

// Active form

use bootstrap\helpers\Html;

class TbActiveForm extends CActiveForm {
    function someMethod() {
        return Html::someStaticHelperMethod(); // calls the core implementation
    }
}

/* Custom implementation */

// Helper

namespace app\helpers;

class Html extends \bootstrap\helpers\Html {
    public static function someStaticHelperMethod() {
        // overridden method
    }    
}

// Active form

use app\helpers\Html;

class ActiveForm extends TbActiveForm {
    function someMethod() {
        return Html::someStaticHelperMethod(); // calls the overridden method
    }
}