How to output all leap years in the 20th century in PHP
In the previous article "How to obtain a 10-line Yang Hui triangle through a PHP program", we introduced the method of using PHP to output any line of Yang Hui triangle. Interested friends can learn about it~
In this article, we will learn how to use PHP to determine whether a given year is a leap year, and how to output all leap years in the 20th century.
First of all, let’s briefly understandWhat is a leap year? A leap year refers to a year with a leap day in the Gregorian calendar (that is, February has 29 days).
There are certain rules for leap years. According to this rule, you can determine whether a given year is a leap year
-
Ordinary leap years: Gregorian calendar years can A leap year is one that is divisible by 4 and not divisible by 100. (For example, 2004 is a leap year, and 1900 is not a leap year)
That is:
$year%4==0&&$year%100!=0
Century leap year: Gregorian calendar year A leap year is one that is divisible by 400 but not divisible by 3200. (For example, the year 2000 is a leap year, and the year 3200 is not a leap year)
That is:
$year%400==0&&$year%3200!=0
Let’s summarize it and see how to output the 20th century All leap years
Analysis:
Because all leap years in the 20th century are output, a for loop must be used to limit the range; and the 20th century refers to 1901 The period from January 1st to December 31st, 2000, so the for loop can be written like this:
for($year = 1901; $year <= 2000; $year++){
//循环体
}Then in the loop body, use the if else statement to connect the algorithms for leap year judgment together:
if($year%400==0&&$year%3200!=0){
}
else if($year%4==0&&$year%100!=0){
}So we can give a method to determine leap years and output all leap years in the 20th century:
";//世纪年里的闰年
}
else if($year%4==0&&$year%100!=0){
echo $year."是普通闰年!
";//普通年里的闰年
}
}
?>The output result is:
Okay, that’s all. If you want to know anything else, you can click this. → →php video tutorial
The above is the detailed content of How to output all leap years in the 20th century in PHP. For more information, please follow other related articles on the PHP Chinese website!
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