/**
 * PHP年龄计算函数
 *
 * @param 
 * @author 编程之家 jb51.cc jb51.cc
 **/
function birthday ($birthday){
	list($year,$month,$day) = explode("-",$birthday);
	$year_diff  = date("Y") - $year;
	$month_diff = date("m") - $month;
	$day_diff   = date("d") - $day;
	if ($day_diff < 0 || $month_diff < 0)
	  $year_diff--;
	return $year_diff;
}
/***   来自编程之家 jb51.cc（jb51.cc）   ***/