将时间以距今多久的形式表示,PHP,js双版本

废话不多说直接上代码。
PHP FOR Smarty

* Name: time_ago 
* Purpose: 将时间戳专为距当前时间的表现形式 
* 1分钟内按秒 
* 1小时内按分钟显示 
* 1天内按时分显示 
* 3天内以昨天，前天显示 
* 超过3天显示具体日期 
* 
* @author Peter Pan 
* @param int $time input int 
*/ 
function smarty_modifier_time_ago($time) { 
$time_deff = time() - $time; 
$retrun = ''; 
if ($time_deff >= 259200) { 
$retrun = date('Y-m-d H:i', $time); 
} else if ($time_deff >= 172800) { 
$retrun = "前天 " . date('H:i', $time); 
} else if ($time_deff >= 86400) { 
$retrun = "昨天" . date('H:i', $time); 
} else if ($time_deff >= 3600) { 
$hour = intval($time_deff / 3600); 
$minute = intval(($time_deff % 3600) / 60); 
$retrun = $hour . '小时'; 
if ($minute > 0) { 
$retrun .= $minute . '分钟'; 
} 
$retrun .= '前'; 
} else if ($time_deff >= 60) { 
$minute = intval($time_deff / 60); 
$second = $time_deff % 60; 
$retrun = $minute . '分'; 
if ($second > 0) { 
$retrun .= $second . '秒'; 
} 
$retrun .= '前'; 
}else{ 
$retrun = $time_deff.'秒前'; 
} 
return $retrun; 
}

Javascript
JS比较复杂一点，分为3个函数实现

/** 
* 字符串填充 
* @param string str 要进行填充的字符串 
* @param int len 目标字符串长度 
* @param str chr 用于填充的字符 默认为空格 
* @param str dir 填充位置 left|right|both 默认为right 
*/ 
function strPad(str, len, chr, dir){ 
str = str.toString(); 
len = (typeof len == 'number') ? len : 0; 
chr = (typeof chr == 'string') ? chr : ' '; 
dir = (/left|right|both/i).test(dir) ? dir : 'right'; 
var repeat = function(c, l) { 
var repeat = ''; 
while (repeat.length < l) { 
repeat += c; 
} 
return repeat.substr(0, l); 
} 
var diff = len - str.length; 
if (diff > 0) { 
switch (dir) { 
case 'left': 
str = '' + repeat(chr, diff) + str; 
break; 
case 'both': 
var half = repeat(chr, Math.ceil(diff / 2)); 
str = (half + str + half).substr(1, len); 
break; 
default: 
str = '' + str + repeat(chr, diff); 
} 
} 
return str; 
} 
/** 
* 格式化日期 
* 类似php Date函数，传入Unix 时间戳（秒级）返回指定格式 
* 格式(不区分大小写)： 
* y 表示4位年份 
* m 表示2位月份 
* d 表示2位日 
* h 表示2位时 
* i 表示2位分 
* s 表示2位秒 
*/ 
function formatDate(format,timestamp) { 
var date = new Date(parseInt(timestamp) * 1000); 
var year = date.getFullYear(); 
var month = date.getMonth(); 
var day = date.getDate(); 
var hour = date.getHours(); 
var minute = date.getMinutes(); 
var second = date.getSeconds(); 
month = strPad(month,2,'0','left'); 
day = strPad(day,2,'0','left'); 
hour = strPad(hour,2,'0','left'); 
minute = strPad(minute,2,'0','left'); 
second = strPad(second,2,'0','left'); 
format = format.replace(/y/gi,year); 
format = format.replace(/m/gi,month); 
format = format.replace(/d/gi,day); 
format = format.replace(/h/gi,hour); 
format = format.replace(/i/gi,minute); 
format = format.replace(/s/gi,second); 
return format; 
} 
function timeAgo(time) { 
var nowTime = Date.parse(new Date()) / 1000; 
var time_deff = nowTime - time; 
retrun = ''; 
if (time_deff >= 259200) { 
retrun = formatDate('Y-m-d H:i', time); 
} else if (time_deff >= 172800) { 
retrun = "前天 " + formatDate('H:i', time); 
} else if (time_deff >= 86400) { 
retrun = "昨天" + formatDate('H:i', time); 
} else if (time_deff >= 3600) { 
hour = parseInt(time_deff / 3600); 
minute = parseInt((time_deff % 3600) / 60); 
retrun = hour + '小时'; 
if (minute > 0) { 
retrun += minute + '分钟'; 
} 
retrun += '前'; 
} else if (time_deff >= 60) { 
minute = parseInt($time_deff / 60); 
second = time_deff % 60; 
retrun = minute + '分'; 
if (second > 0) { 
retrun += second + '秒'; 
} 
retrun += '前'; 
}else{ 
retrun = time_deff +'秒前'; 
} 
return retrun; 
}