php - Add X Days To Date, Excluding Weekends

Question

I'm currently developing an online subscription application. I'm having some challenges on the part where the user will select the Number of Days to subscribe and then the Start Date. The PHP application should then be able to calculate the End Date excluding weekends.

<form method="post">
    <input name="startdate" type="text" />
    <input name="numberofdays" type="text" />
</form>

Someone can help me with this?

Answer 1

depends how the startdate is sent, but assuming you are using Y-m-d you can use DateTime

eg:

<?php 

    $_POST['startdate'] = '2012-08-14';
    $_POST['numberofdays'] = 10;

    $d = new DateTime( $_POST['startdate'] );
    $t = $d->getTimestamp();

    // loop for X days
    for($i=0; $i<$_POST['numberofdays']; $i++){

        // add 1 day to timestamp
        $addDay = 86400;

        // get what day it is next day
        $nextDay = date('w', ($t+$addDay));

        // if it's Saturday or Sunday get $i-1
        if($nextDay == 0 || $nextDay == 6) {
            $i--;
        }

        // modify timestamp, add 1 day
        $t = $t+$addDay;
    }

    $d->setTimestamp($t);

    echo $d->format( 'Y-m-d' ). "
";

?>