PHP将时间格式化几天前、几分钟前等

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<?PHP

class DateFormat
{
    private static $_DIFF_FORMAT = array(
        'DAY'           => '%s天前','DAY_HOUR'      => '%s天%s小时前','HOUR'          => '%s小时','HOUR_MINUTE'   => '%s小时%s分前','MINUTE'        => '%s分钟前','MINUTE_SECOND' => '%s分钟%s秒前','SECOND'        => '%s秒前',);

    /**
     * 友好格式化时间
     * 
     * @param int 时间
     * @param array $formats
     * @return string
     */
    public static function diff($timestamp,$formats = null) 
    {
        if ($formats == null) {
            $formats = self::$_DIFF_FORMAT;
        }
        /* 计算出时间差 */
        $seconds = time() - $timestamp;
        $minutes = floor($seconds / 60);
        $hours   = floor($minutes / 60);
        $days    = floor($hours / 24);

        if ($days > 0) {
            $diffFormat = 'DAY';
        } else {
            $diffFormat = ($hours > 0) ? 'HOUR' : 'MINUTE';
            if ($diffFormat == 'HOUR') {
                $diffFormat .= ($minutes > 0 && ($minutes - $hours * 60) > 0) ? '_MINUTE' : '';
            } else {
                $diffFormat = (($seconds - $minutes * 60) > 0 && $minutes > 0) 
                                ? $diffFormat.'_SECOND' : 'SECOND';
            }
        }

        $dateDiff = null;
        switch ($diffFormat) {
            case 'DAY':
                $dateDiff = sprintf($formats[$diffFormat],$days);
                break;
            case 'DAY_HOUR':
                $dateDiff = sprintf($formats[$diffFormat],$days,$hours - $days * 60);
                break;
            case 'HOUR':
                $dateDiff = sprintf($formats[$diffFormat],$hours);
                break;
            case 'HOUR_MINUTE':
                $dateDiff = sprintf($formats[$diffFormat],$hours,$minutes - $hours * 60);
                break;
            case 'MINUTE':
                $dateDiff = sprintf($formats[$diffFormat],$minutes);
                break;
            case 'MINUTE_SECOND':
                $dateDiff = sprintf($formats[$diffFormat],$minutes,$seconds - $minutes * 60);
                break;
            case 'SECOND':
                $dateDiff = sprintf($formats[$diffFormat],$seconds);
                break;
        }
        return $dateDiff;
    }
}

echo DateFormat::diff('1310455823');
/* 33分钟47秒前  */

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