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
/**
* PHP计算多长时间之前的函数
*
* @param
* @author 编程之家 jb51.cc jb51.cc
**/
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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