php中获取时间的几套方法（收集）
1、jddayofweek(cal_to_jd(CAL_GREGORIAN, date('m'), date('d'), date('Y')));此函数返回日期在周几
2、array('Mon'=>'星期一',......);然后直接下标查询
3、根据日期获取周几的自定义函数

<?php
	function getWeekName($data,$format = '星期')
	{
	    $week   =  date( "D ",$data);
            switch($week)
	    {
	        case "Mon ":
	            $current   =   $format."一";
	            break;
	        case "Tue ":
	            $current   =   $format."二";
	            break;
	        case "Wed ":
	            $current   =   $format."三";
	            break;
	        case "Thu ":
	            $current   =   $format."四";
	            break;
	        case "Fri ":
	            $current   =   $format."五";
	            break;
	        case "Sat ":
	            $current   =   $format."六";	            break;
	        case "Sun ":
	            $current   =   $format."日";
	            break;
	    }
	    return $current;
	}
	 
	 
	echo '今天是：'.getWeekName(time(),'星期');
	echo '<br>';
	echo '今天是：'.getWeekName(time(),'礼拜');
	echo '<br>';
	echo '2010-12-12是：'.getWeekName(strtotime('2010-12-12'),'礼拜');
	?>

4、获取类似文章发表的几小时前等效果的自定义函数

<?php
function time2Units ($time)
{
$year = floor($time / 60 / 60 / 24 / 365);
$time -= $year * 60 * 60 * 24 * 365;
$month = floor($time / 60 / 60 / 24 / 30);
$time -= $month * 60 * 60 * 24 * 30;
$week = floor($time / 60 / 60 / 24 / 7);
$time -= $week * 60 * 60 * 24 * 7;
$day = floor($time / 60 / 60 / 24);
$time -= $day * 60 * 60 * 24;
$hour = floor($time / 60 / 60);
$time -= $hour * 60 * 60;
$minute = floor($time / 60);
$time -= $minute * 60;
$second = $time;
$elapse = '';

$unitArr = array('年' =>'year', '个月'=>'month', '周'=>'week', '天'=>'day',
'小时'=>'hour', '分钟'=>'minute', '秒'=>'second'
);

foreach ( $unitArr as $cn => $u )
{
if ( $$u > 0 )
{
$elapse = $$u . $cn;
break;
}
}

return $elapse;
}

$past = 2052345678; // 发布日期
$now = time(); // 当前日期
$diff = $now - $past;//相差值

echo '发表于' . time2Units($diff) . '前';
?>

另一种，个人认为比较好的：

function time_tran($the_time){
$now_time = date("Y-m-d H:i:s",time()+8*60*60);
$now_time = strtotime($now_time);
$show_time = strtotime($the_time);
$dur = $now_time - $show_time;
if($dur < 0){
return $the_time;
}else{
if($dur < 60){
    return $dur.'秒前';
}else{
    if($dur < 3600){
   return floor($dur/60).'分钟前';
    }else{
   if($dur < 86400){
   return floor($dur/3600).'小时前';
   }else{
   if($dur < 259200){//3天内
       return floor($dur/86400).'天前';
   }else{
       return $the_time;
   }
   }
    }
}
}
}

5、根据两时间差具体算相差时间

function getTime( $val ){
if($val>0){
$nTime['nDay'] = (int)($val/(3600*24));
$nTime['nHour'] = (int)($val%(3600*24)/3600);
$nTime['nMin'] = (int)($val%(3600*24)%3600/60);
$nTime['nSec'] = (int)($val%(3600*24)%3600%60);
}
return $nTime ;
}
function getStrTime( $val ){
$aTime = getTime($val);
$dtoc = array('nDay'=>'天','nHour'=>'小时','nMin'=>'分','nSec'=>'秒');
if( $aTime ){
foreach( $aTime as $k=>$v){
if($v){
$cTime .= $v.$dtoc[$k];
}
}
}else{
$cTime = '已结止';
}
return $cTime;
}