PHP End of Month Plus

I was trying to find how to calculate end of the month + 60 days in PHP, took a while but finally got it working using the below code - just change 60 days to whatever you want

end_of_month_plus_60_days.php 
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<?php

    $invoice_date ='now'; //use 'now' if for the current month else add your data here

    $d = new DateTime( $invoice_date );
    $d->modify( 'last day of this month' );
    $d->modify( '+60 days' );
    $due_date = $d->format( 'Y-m-d' );

?>