转换时间戳为n天/小时/分/秒前

convert2timeago.php

<?php
    /**
     * 转换时间戳为n天/小时/分/秒前
     * 
     * @param unknown $timestamp 时间戳
     * 
     * @return string
     */
    function convert2timeago($timestamp)
    {
        $nowtime = time();
        $tmp = $nowtime - $timestamp;
        $day_num = intval($tmp / (3600*24));          //天数
        
        if ($day_num > 0) {
            return $day_num . '天前';
        }
        
        $remain_hour = $tmp % (3600*24);        //除去天数之后剩余秒数
        $hour_num = intval($remain_hour/3600);  //小时数
        
        if ($hour_num>0) {
            return $hour_num . '小时前';
        }
        
        $remain_minute = $remain_hour % 3600;   //除去小时数之后剩余秒数
        $minute_num = intval($remain_minute / 60);  //分种数
        
        if ($minute_num>0) {
            return $minute_num . '分钟前';
        }
        
        $remain_second = $remain_minute % 60;    //秒数
        
        return $remain_second . '秒前';
    }