Two leap years in five year period

Hope someone can help me. User defines two dates(dd/mm/yy, then want to display 1) Difference in days between the two inputs in dd/mm/yy and 2) the difference in days between the dates. The problem is I always want to show the difference i dd/mm/yy no matter how long the period is but the maximun value I want to show for days is 1825 or 1826(which is five years depending on if it´s one or two leapyears in the given period). Please help. Give me some hlep how to do the second bit. How do I know to stop on 1825 or 1826.

Thank you so much!

 

The date function has the "L" syntax that returns zero or one depending on whether it's a leapyear.

You can do the default 365*5 then add up the values returned from date("L") for each of the years involved.

$start_year = 2000;
$end_year = 2005;
$days = (365 * 5);
for($year = $start_year; $year <= $end_year; $year++)
{
   $days += date('L', strtotime("1 January $year"));
}

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