How can I add a week to this date?

You should be able to just do a +7 days in order to get the next week.

Here's what I'm trying:

$week_one=date("m/d/Y", strtotime($week_start+7days));

Not working.

Where am I blowing it?

I would start by trying something like this.

$day = date('w'+7);

This should advance the day to 7 days in the future.

PHP date('w') is documented here:
http://php.net/manual/en/function.date.php

It's the number of the day of the week, modulus 7.

Thanks for correcting that for me Ray.  I appreciate the information.

Guys! I appreciate the info.

Ray, here's your suggestion:

$today = date('c');
$later = date('c', strtotime("$today + 1 week"));

Perfect.

Here's my attempt to employ your wisdom in context:

$day = date('w');
$week_start = date('m-d-Y', strtotime('-'.$day.' days'));
//$week_end = date('m-d-Y', strtotime('+'.(6-$day).' days'));

$later = date('m/d/Y', strtotime("$week_start + 7"));
echo $later;

Bleak. I get 12/31/1969

No doubt, I'm attempting a calculation on a value that's meant more for display purposes - and I'm making that statement based on your reference to mktime.

But, still, it seems like it should work. What am I missing?

Confused as to what is wrong with the DateTime::add function with DateInterval - seems to do exactly what is required without converting dates to time stamps and back again?

Maybe this will shed a little more light on it?  I feel like we're not really understanding your problem yet.

<?php // demo/temp_brucegust.php

/**
 * http://www.experts-exchange.com/questions/28714666/How-can-I-add-a-week-to-this-date.html
 * http://www.experts-exchange.com/articles/201/Handling-Date-and-Time-in-PHP-and-MySQL.html
 * http://php.net/manual/en/function.date.php
 */
error_reporting(E_ALL);


// SHOW HOW TO FIND THE FIRST AND LAST DAY OF THIS WEEK
$patrn = 'D Y-m-d';
$today = date($patrn);
$wdays = date('w');
$newer = date($patrn, strtotime($today . "- $wdays DAYS"));
$later = date($patrn, strtotime($newer . '+ 6 DAYS'));
var_dump($newer, $today, $later);

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Thanks, guys!

Here's where I landed:

$day = date('w');
$week_start = date('c', strtotime('-'.$day.' days'));
$this_week = date('c', strtotime($week_start));