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HomeBackend DevelopmentPHP TutorialPHP实现时间轴函数(个人化时间)

PHP实现时间轴函数(个性化时间)
我们在论坛发帖、发表评论、或者是使用QQ空间发布日志、微博发表言论时,会看到发表的内容后的时间显示为“刚刚”、“5分钟前”、“昨天10:23”等,而不是直接显示具体日期和时间。
本文将介绍如何实现基于时间轴的时间的转换。
首先我们要明白时间的几个函数:
time():返回当前的 Unix 时间戳
date():格式化一个本地时间/日期。
应用举例:
date("Y-m-d H:i:s",time());
格式化当前时间,输出:2010-10-11 05:27:35
strtotime():将任何英文文本的日期时间描述解析为 Unix 时间戳。
应用举例:
echo strtotime("+1 day"), "\n";
输出1天前的时间戳:1286861475
date_default_timezone_set():设定要用的默认时区。
一般我们设置北京时间:date_default_timezone_set("PRC");
理解上面几个函数后我们来写时间轴函数:
该函数的原理就是将系统当前时间与目标时间比较,得到一个差值,再将差值与时间范围(转换成秒)比较,根据其处在时间轴的范围输出不同的结果(如:5分钟前)。为了便于计算,我们将时间都转换成Unix时间戳。
function tranTime($time) {
    $rtime = date("m-d H:i",$time);
    $htime = date("H:i",$time);
    
    $time = time() - $time;

    if ($time         $str = '刚刚';
    }
    elseif ($time         $min = floor($time/60);
        $str = $min.'分钟前';
    }
    elseif ($time         $h = floor($time/(60*60));
        $str = $h.'小时前 '.$htime;
    }
    elseif ($time         $d = floor($time/(60*60*24));
        if($d==1)
           $str = '昨天 '.$rtime;
        else
           $str = '前天 '.$rtime;
    }
    else {
        $str = $rtime;
    }
    return $str;
}
函数tranTime()中的参数$time必须为Unix时间戳,如果不是请先用strtotime()将其转换成Unix时间戳。上面的代码一看就明白了,不用再多述。
调用函数,直接输出:
$times="1286861696 ";
echo tranTime($times);
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