<?php
class Zend_View_Helper_String extends Zend_View_Helper_Abstract {
    
    
    public function removeLastCharacter($string, $char){
        $string = trim($string);
        return rtrim($string, $char);
    }
    
    
    public function cleanCommaSepString($string){ 
       $string = $this->removeLastCharacter($string,',');
       $arrString = explode("," , $string);
       $arrString = array_filter($arrString);
       $arrString = array_unique($arrString);
       return implode(',', $arrString);
    }
    
    public function removeItemFromCommaSepString($string, $item) {
        $array = explode(",", $string);
        if (($key = array_search($item, $array)) !== false) {
                unset($array[$key]);
        }
        return implode(",", $array);
    }
    
    
    public function viewCommaSepString4UI($string){ 
       $string = $this->cleanCommaSepString($string);
       return str_replace(",", ", ", $string);
    }
    
    
    public function removeHtmlTags($str) {
        return strip_tags($str);
    }
    
}