original_string: public function getOrderBy($field)
      {
          return array_key_exists($field, $this->orderBy) ?
                    $this->orderBy[$field]
                  : null;
      }
code: public function getOrderBy($field)
      {
          return array_key_exists($field, $this->orderBy) ?
                    $this->orderBy[$field]
                  : null;
      }
code_tokens: public function getOrderBy ( $ field ) { return array_key_exists ( $ field , $ this -> orderBy ) ? $ this -> orderBy [ $ field ] : null ; }
docstring: Returns the OrderBy direction for the field specified
  
  @param string $field the field name to lookup
  
  @return string Returns the direction (ASC or DESC) for the field specified, or null if it doesn't exist.
docstring_tokens: Returns the OrderBy direction for the field specified