


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{ } ?>
Recommended learning: "PHP Video Tutorial"
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php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

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php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。


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