original_string: public function getLastGroupPrefix()
      {
          if (! empty($this->groupStack)) {
              $last = end($this->groupStack);
  
              return isset($last['prefix']) ? $last['prefix'] : '';
          }
  
          return '';
      }
code: public function getLastGroupPrefix()
      {
          if (! empty($this->groupStack)) {
              $last = end($this->groupStack);
  
              return isset($last['prefix']) ? $last['prefix'] : '';
          }
  
          return '';
      }
code_tokens: public function getLastGroupPrefix ( ) { if ( ! empty ( $ this -> groupStack ) ) { $ last = end ( $ this -> groupStack ) ; return isset ( $ last [ 'prefix' ] ) ? $ last [ 'prefix' ] : '' ; } return '' ; }
docstring: Get the prefix from the last group on the stack.
  
  @return string
docstring_tokens: Get the prefix from the last group on the stack .