Increment PHP Months

IncrementMonths.php

$nextMonthDate = $date->copy();
$nextMonthDate->addMonths($addMonths);

// j - Day of the month without leading zeros
if ($nextMonthDate->format('j') != $date->format('j'))
{
    $date->modify('last day of +'.$addMonths.' months');
}
else
{
    $date->addMonths($addMonths);
}