original_string: protected function _attr_unique(&$attributes, &$field)
  	{
  		if ( ! empty($attributes['UNIQUE']) && $attributes['UNIQUE'] === TRUE)
  		{
  			$field['unique'] = ' UNIQUE CONSTRAINT '.$this->db->escape_identifiers($field['name']);
  		}
  	}
code: protected function _attr_unique(&$attributes, &$field)
  	{
  		if ( ! empty($attributes['UNIQUE']) && $attributes['UNIQUE'] === TRUE)
  		{
  			$field['unique'] = ' UNIQUE CONSTRAINT '.$this->db->escape_identifiers($field['name']);
  		}
  	}
code_tokens: protected function _attr_unique ( & $ attributes , & $ field ) { if ( ! empty ( $ attributes [ 'UNIQUE' ] ) && $ attributes [ 'UNIQUE' ] === TRUE ) { $ field [ 'unique' ] = ' UNIQUE CONSTRAINT ' . $ this -> db -> escape_identifiers ( $ field [ 'name' ] ) ; } }
docstring: Field attribute UNIQUE
  
  @param	array	&$attributes
  @param	array	&$field
  @return	void
docstring_tokens: Field attribute UNIQUE