Leap Year Program

A leap year is the one which has 366 days in a year. A leap year comes after every four years. Hence a leap year is always a multiple of four.

For example, 2016, 2020, 2024, etc are leap years.

Leap Year Program

This program states whether a year is leap year or not from the specified range of years (1991 - 2016).

Example:

<?php
function isLeap($year)
{
    return (date('L', mktime(0, 0, 0, 1, 1, $year))==1);
}
//For testing
for($year=1991; $year<2016; $year++)
{
    If (isLeap($year))
    {
        echo "$year : LEAP YEAR<br />\n";
    }
    else
    {
        echo "$year : Not leap year<br />\n";
    }
}
?>

Output:

Leap Year Program in Form

This program states whether a year is leap year or not by inserting a year in the form.

Example:

<html>
<body>
    <form method="post">
        Enter the Year: <input type="text" name="year">
        <input type="submit" name="submit" value="Submit">
    </form>
</body>
</html>
<?php 
    if($_POST)
    {   
        //get the year
        $year = $_POST['year']; 
        //check if entered value is a number
        if(!is_numeric($year))
        {
            echo "Strings not allowed, Input should be a number";
            return;
        } 
        //multiple conditions to check the leap year
        if( (0 == $year % 4) and (0 != $year % 100) or (0 == $year % 400) )
        {
            echo "$year is a Leap Year";  
        }
        else
        {
            echo "$year is not a Leap Year";  
        }
    } 
?>

Output:

On entering year 2016, we get the following output.