本文实例讲述了PHP常用函数之格式化时间操作。分享给大家供大家参考，具体如下：

/**
 * 格式化时间
 * @param $time 时间戳
 * @return bool|string
 */
function formatTimeToNow($time){
  //获取现在的时间戳
  $nowtime = time();
  if($time>$nowtime){
    return '';
  }else{
    $tc = $nowtime-$time;
    if( $tc >= 864000 ){
      $str = date('Y-m-d H:i',$time);//如果大于10天,则直接显示日期
    }else if( $tc >= 86400){
      $str = floor($tc/86400) . "天前";//如果大于1天
    }else if( $tc >= 3600) {
      $str = floor($tc / 3600) . "小时前";//如果大于1小时
    }else if( $tc >= 60) {
      $str = floor($tc / 60) . "分钟前";//如果大于1分钟
    }else{
      $str = "刚刚";
    }
    return $str;
  }
}

/**
 * 将中文的日期格式化为正常的日期
 * @param $date
 * @return mixed
 */
function formatCnDateToDate($date){
  //把年月替换为-，日替换为空
  $date = str_replace('年','-',$date);
  $date = str_replace('月','-',$date);
  $date = str_replace('日','',$date);
  //避免提交的格式不统一，例如2018-3-2等，标准化
  return date('Y-m-d',strtotime($date));
}

/**
 * 计算自然周期的开始时间戳和结束时间戳（周一到周日，月初到月末）
 * @param int $time_type 1表示自然天，2表示自然周，3表示自然月
 * @param int $prev_num 距离现在的值（前一周传-1，前两周传-2...）
 * @return array|bool
 */
function naturalFormatTime($time_type=1,$prev_num=0){
  $today_start_time = strtotime(date('Y-m-d 00:00:00',time()));//今天0点的时间戳
  if($time_type == 1){
    if($prev_num == 0){
      return array('start_time'=>$today_start_time,'end_time'=>time(),'show_date'=>date('Y年m月d日',time()));
    }else if($prev_num < 0){
      $start_time = $today_start_time - 86400*abs($prev_num);
      $end_time = $start_time + 86399;
      $show_date = date('Y年m月d日',$start_time);
      return array('start_time'=>$start_time,'end_time'=>$end_time,'show_date'=>$show_date);
    }else{
      return false;
    }
  }else if($time_type == 2){
    $today_week = date('w',$today_start_time);
    if($today_week == 0){
      $today_week_start_time = $today_start_time - 86400*6;
    }else{
      $today_week_start_time = $today_start_time - 86400*($today_week-1);
    }
    if($prev_num == 0){
      $show_date = date('Y年m月d日',$today_week_start_time);
      $show_date .= '至' . date('d日',time());
      return array('start_time'=>$today_week_start_time,'end_time'=>time(),'show_date'=>$show_date);
    }else if($prev_num < 0){
      $start_time = $today_week_start_time - 86400*7 * abs($prev_num);
      $end_time = $start_time + (86400*7-1);
      $show_date = date('Y年m月d日',$start_time);
      $show_date .= '至' . date('d日',$end_time);
      return array('start_time'=>$start_time,'end_time'=>$end_time,'show_date'=>$show_date);
    }else{
      return false;
    }
  }else if($time_type == 3){
    if($prev_num == 0){
      $today_day = ltrim(date('d',$today_start_time),0);
      $today_month_start_time = $today_start_time - 86400*($today_day-1);
      $show_date = date('Y年m月d日',$today_month_start_time);
      $show_date .= '至' . date('d日',time());
      return array('start_time'=>$today_month_start_time,'end_time'=>time(),'show_date'=>$show_date);
    }else if($prev_num < 0){
      $start_time = strtotime(date('Y-m-01', strtotime("$prev_num month")));
      $days = date('t',$start_time);
      $end_time = $start_time + 86400 * $days -1;
      $show_date = date('Y年m月d日',$start_time);
      $show_date .= '至' . date('d日',$end_time);
      return array('start_time'=>$start_time,'end_time'=>$end_time,'show_date'=>$show_date);
    }else{
      return false;
    }
  }else{
    return false;
  }
}