public function repeat( $multiplier )
	{
		if( !is_int( $multiplier ) )
			throw new InvalidArgumentException( 'Multiplier must be integer' );
		if( $multiplier < 0 )
			throw new InvalidArgumentException( 'Multiplier must be atleast 0' );
		$length			= $this->getLength();
		$this->string	= str_repeat( $this->string, $multiplier + 1 );
		return $this->getLength() - $length;
	}