php获取时间计算时间差

用php获取本周、本月第一天与最后天时间戳。

1，获取今天的时间范围：

<?php
$start = mktime(0,0,0,date("m"),date("d"),date("Y")); 
$end = mktime(0,0,0,date("m"),date("d")+1,date("Y")); 

2，获取本周第一天/最后一天的时间戳

<?php
$year = date("Y");
$month = date("m");
$day = date('w');
$nowMonthDay = date("t");

$firstday = date('d') - $day;
if(substr($firstday,0,1) == "-"){
 $firstMonth = $month - 1;
 $lastMonthDay = date("t",$firstMonth);
 $firstday = $lastMonthDay - substr($firstday,1);
 $time_1 = strtotime($year."-".$firstMonth."-".$firstday);
}else{
 $time_1 = strtotime($year."-".$month."-".$firstday);
}
  
$lastday = date('d') + (7 - $day);
if($lastday > $nowMonthDay){
 $lastday = $lastday - $nowMonthDay;
 $lastMonth = $month + 1;
 $time_2 = strtotime($year."-".$lastMonth."-".$lastday);
}else{
 $time_2 = strtotime($year."-".$month."-".$lastday);
}

3，获取本月第一天/最后一天的时间戳

<?php
$year = date("Y");
$month = date("m");
$allday = date("t");
$strat_time = strtotime($year."-".$month."-1");
$end_time = strtotime($year."-".$month."-".$allday);

计算时间差

$one = strtotime('2011-12-08 07:02:40');//开始时间 时间戳
$tow = strtotime('2011-12-25 00:00:00');//结束时间 时间戳
$cle = $tow - $one; //得出时间戳差值

$d = floor($cle/3600/24);
$h = floor(($cle%(3600*24))/3600);  //%取余
$m = floor(($cle%(3600*24))600/60);
$s = floor(($cle%(3600*24))`);

echo "两个时间相差 $d 天 $h 小时 $m 分 $s 秒"