How to determine whether the specified date is the previous day in php

Judgment method: 1. Use the "strtotime("date")" statement to convert the specified date into a timestamp; 2. Use the "time()" statement to obtain the current timestamp; 3. Convert the two timestamps Subtract to get the time difference; 3. Use "floor(time difference/86400)" to convert the time difference into the number of days apart. If it is one day apart, it is the previous day.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

In php, determine whether the specified date is the previous one One day, it can be converted into whether the specified date and the current date are one day apart, which is a time difference problem.

Implementation idea:

• Use strtotime() function to convert the specified date into a timestamp

• Use time() function Get the current timestamp

• Subtract the two timestamps to get the time difference

• Divide the time difference by the total number of seconds in a day (24* 60*60=86400), use floor() to round, convert the time difference into several days apart

• Determine whether the number of days apart is 1

Implementation code:

It is currently April 20th, give a designated time of April 19th

Let’s take a look Whether the specified time is the previous day

<?php
header("Content-type:text/html;charset=utf-8");
//2022年4月19日 
$time1=strtotime("2022-4-19");
//当前时间戳
$time2=time();

$diff_seconds = $time2 - $time1;
$diff_days = floor($diff_seconds/86400);
echo "两个日期相差： ".$diff_days." 天";
if($diff_days==1){
	echo "<br>指定日期是前一天";
}else{
}
?>

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