public function normaliseHamza($text) 
    {
        $replace = array(
             $this->_chars['WAW_HAMZA'] => $this->_chars['WAW'],
             $this->_chars['YEH_HAMZA'] => $this->_chars['YEH'],
        );
        $alephs = array(
             $this->_chars['ALEF_MADDA'],
             $this->_chars['ALEF_HAMZA_ABOVE'],
             $this->_chars['ALEF_HAMZA_BELOW'],
             $this->_chars['HAMZA_ABOVE'],
             $this->_chars['HAMZA_BELOW']
        );

        $text = str_replace(array_keys($replace), array_values($replace), $text);
        $text = str_replace($alephs, $this->_chars['ALEF'], $text);
        return $text;
    }