计算时间差

<?php
/**
 * 函数名：puttime
 * 作用：计算参数时间与当前时间差，精确的秒，最大单位天
 * 作者：七夜
 * 日期：2009-10-12
 */
    function puttime( $times )
    {
        if( $times == '' || $times==0) return false;
        $dtime =is_int($times) ? $times : strtotime($times);
        $ptime = time() - $dtime;
        if( $ptime < 60 )
        {
            $pct = sprintf("发布于%d秒前",$ptime);
        }
        else if( $ptime > 60 && $ptime < 3600 )
        {
            $pct = sprintf("发布于%d分钟前",ceil( $ptime / 60 ));
        }
        else if( $ptime > 3600 && $ptime < (3600 * 24) )
        {
            $pct = sprintf("发布于%d小时%d分钟前", floor( $ptime / 3600 ), ceil( ( $ptime % 3600 ) / 60 ));
        }
        else if( $ptime > (3600 * 24) && $ptime < (3600*24*30))
        {
            $d = $ptime / (3600*24);
            $h = ( $ptime % (3600*24)) / 3600;
            $m = ceil( ( ( $ptime % (3600*24)) % 3600 ) / 60 );
            $pct = sprintf("发布于%d天%d小时%d分钟前", $d, $h, $m );
        }
        else
        {
            $mt = $ptime / ( 3600*24*30);
            $d = ($ptime % ( 3600*24 * 30))/ (3600*24);
            $h = ( ($ptime % ( 3600*24 * 30))% (3600*24)) / 3600;
            $m = ceil( ( ($ptime % ( 3600*24 * 30))% (3600*24)) % 3600 / 60 );
            $pct = sprintf("发布于%d月%d天%d小时%d分钟前", $mt, $d, $h, $m );
        }
        return $pct;
    }
echo puttime( '2008-9-10 23:59:59' ).'
';
?>