这里给定一个时间，计算这个时间在多久前，比如：2天前，1年前

<?php

function prettyDate($date){

$time = strtotime($date);

$now = time();

$ago = $now - $time;

if($ago < 60){

$when = round($ago);

$s = ($when == 1)?"second":"seconds";

return "$when $s ago";

}elseif($ago < 3600){

$when = round($ago / 60);

$m = ($when == 1)?"minute":"minutes";

return "$when $m ago";

}elseif($ago >= 3600 && $ago < 86400){

$when = round($ago / 60 / 60);

$h = ($when == 1)?"hour":"hours";

return "$when $h ago";

}elseif($ago >= 86400 && $ago < 2629743.83){

$when = round($ago / 60 / 60 / 24);

$d = ($when == 1)?"day":"days";

return "$when $d ago";

}elseif($ago >= 2629743.83 && $ago < 31556926){

$when = round($ago / 60 / 60 / 24 / 30.4375);

$m = ($when == 1)?"month":"months";

return "$when $m ago";

}else{

$when = round($ago / 60 / 60 / 24 / 365);

$y = ($when == 1)?"year":"years";

return "$when $y ago";

}

}

echo prettyDate("2012-07-22 12:23:45")."<br />";

echo prettyDate("2010-11-12 22:25:45")."<br />";

echo prettyDate("2012-01-01 01:00:00")."<br />";

echo prettyDate("2001-05-30 00:00:00")."<br />";

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