Question

How to check leap year in PHP

Answer 1

$year = 2016;

if ($year % 400 == 0) 
    echo $year . " is a leap year.";
else if ($year % 100 == 0)
         echo $year . " is not a leap year.";
    else if ($year % 4 == 0)
             echo $year . " is a leap year.";
        else
             echo $year . " is not a leap year."; 
     
/*

run:

2016 is a leap year.

*/

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Answer 2

$years = array(2000, 2400, 1800, 1900, 2100, 2200, 2300, 2500,
               2008, 2012, 2016, 2020, 2024, 2048, 2032);
     
foreach ($years as $yr)
{
    if (isLeapYear($yr))
        echo $yr. " is a leap year.
";
    else
        echo $yr. " is not a leap year.
";
}
    
function isLeapYear($year) 
{
    if ($year % 400 == 0)
        return true;
    else if ($year % 100 == 0)
             return false;
    else if ($year % 4 == 0)
             return true;
     
    return false;
}
     
/*

run:

2000 is a leap year.
2400 is a leap year.
1800 is not a leap year.
1900 is not a leap year.
2100 is not a leap year.
2200 is not a leap year.
2300 is not a leap year.
2500 is not a leap year.
2008 is a leap year.
2012 is a leap year.
2016 is a leap year.
2020 is a leap year.
2024 is a leap year.
2048 is a leap year.
2032 is a leap year.

*/

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