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sakhradam #1

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17 changes: 17 additions & 0 deletions leap.php
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Original file line number Diff line number Diff line change
@@ -0,0 +1,17 @@
<?php
function isLeap($year)
{
return by400($year) or (by4($year) and notBy100($year));
}
function by4($number)
{
return $number % 4 == 0;
}
function notBy100($number)
{
return $number % 100 != 0;
}
function by400($number)
{
return $number % 400 == 0;
}