Home > Article > Backend Development > PHP basic case 2: Calculating student age
1. Requirements Analysis
In order to conveniently, accurately and quickly display the student's age, the system usually automatically calculates it based on the student's date of birth. Next, please use PHP variables to save the student's year, month, and day respectively, and obtain the current year, month, and day through the data function in PHP, and finally calculate the student's age.
For example:
The date of birth is: August 2, 2000
If it is May 2020, the age is 20 years old
If it is October 2020, the age is 19 years old
2. Design ideas
How to define Variables store student information. What are these variables?
#How to define variables to save the year, month, and day of a student’s birth?
#How to get the year, month and date of the current time?
#How to calculate a student’s age from birth to the current year?
#How to determine whether a student has a birthday?
3. Knowledge reserve
1. Introduction to PHP Date/Time
Date/Time function allows you to Get the date and time from the server where the PHP script is running. You can use the Date/Time functions to format dates and times in different ways.
2. Definition and usage
date() function formats the local date and time and returns the formatted date string.
3. Syntax
date(format,timestamp);
Returns a string generated by integer timestamp according to the given format string. If no timestamp is given, the local current time is used. In other words, timestamp is optional and the default value is time().
For details, please read this article: https://www.jb51.net/article/148360.htm
4. Several commonly used parameters
4. Code implementation
<?php
//定义变量保存学生出生的年、月、日
$stu_by = 2001;
$stu_bm = 8;
$stu_bd = 07;
//获取当前时间的年份、月份和日期
$cur_y = date('Y'); //4位数字完整表示的年份
$cur_m = date('n'); //数字表示的月份，没有前导零,1~12
$cur_d = date('j'); //月份中的第几天，没有前导零,1~31
//计算学生从出生到当前年的周岁
$age = $cur_y - $stu_by;
//判断学生是否已过生日
if($cur_m < $stu_bm || $cur_m==$stu_bm && $cur_d<$stu_bd){
$age--;
}
?>5. Effect display
Today is November 2, 2020. 
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