function copyright($start, $owner) {
  	$date = date('Y');
		echo "© Copyright ";
		if ( $start < $date ) {
			echo "{$start} - ";
		}
		echo "{$date} {$owner}";
	}
  
 /*
  * 演示范例: 如果当前年份是2013, 使用copyright('2012', 'sharejs.com'); 将输出 
  * © Copyright 2012 - 2013 sharejs.com
  *
  */
//javascript/8236