php gets the timestamp of the first and last day of this week, month

This article introduces the code for using PHP to obtain the timestamps of the first and last days of this week and this month, for reference by friends in need.

Use php to get the timestamps of the first and last days of this week and this month.

1, Get today’s time range:

<?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, get the timestamp of the first/last day of the week

<?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. Get the timestamp of the first/last day of this month

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