PHP生成Facebook 样式的时间戳

Facebook 样式的时间戳

[code lang=”php”]
Facebook (x mins age, y hours ago etc)
function nicetime($date)
{
if(empty($date)) {
return "No date provided";
}

$periods = array("second", "minute", "hour", "day", "week", "month", "year", "decade");
$lengths = array("60","60","24","7","4.35","12","10");

$now = time();
$unix_date = strtotime($date);

// check validity of date
if(empty($unix_date)) {
return "Bad date";
}
// is it future date or past date
if($now > $unix_date) {
$difference = $now – $unix_date;
$tense = "ago";

} else {
$difference = $unix_date – $now;
$tense = "from now";
}

for($j = 0; $difference >= $lengths[$j] && $j < count($lengths)-1; $j++) {
$difference /= $lengths[$j];
}

$difference = round($difference);

if($difference != 1) {
$periods[$j].= "s";
}

return "$difference $periods[$j] {$tense}";
}
[/code]

语法：
[code lang=”php”]
<?php
$date = "2015-07-05 03:45";
$result = nicetime($date); // 2 days ago
?>
[/code]