判断当前发布日期是否超过今天

function isToday($publishDate='') {
	if(empty($publishDate)) {
		return false;
	}
	$curDate = date("Y-m-d");
	$publishDate = substr($publishDate, 0, 10);
	if($curDate === $publishDate) {
		return true;
	}
	return false;
}

var_dump(isToday(‘2011-08-25 15:30:37’));