check if date is within a date range - php

Question

I have a database filled with a bunch of jobs, where I have startDate and endDate.
What Im trying to do is to list current week and 20 weeks ahead, and see if those weeks are within the database.
And when I echo it out I want the date to be green if the date exists and black if not.
It works, but the problem is that it skips the first week. So if I have 2014-07-01 as startDate and 2014-07-14 as endDate, then the second week in that example will get green, not the first one.
This is what I'v done:
UPDATED
$last = 19;
$today = new \DateTime();
$today->modify('Monday this week');
for ($i=0; $i<$last; $i++) {
$the_week = $today->format('o-m-d');
$sql = mysql_query("SELECT startDate,endDate FROM work WHERE '$the_week' BETWEEN startDate AND endDate'");
$row = mysql_fetch_array($sql);
$startdate = $row['startDate'];
$enddate = $row['endDate'];
if(($startdate > $the_week) AND ($enddate < $the_week)) {
$color = "#69dd54;"; } else { $color = "#ffffff;"; }
echo "<span style='color: ". $color ."'>". $the_week ."</span>";
$new_today->modify('next Monday');
}

Answer 1

What is $the_week? It appears to be a date, but there are many dates in a week. For example there is the first date of a week and the last date of the week. It could be that you have a problematic boundary condition here.
You want the start date to be before the last day of a week, and the end date to be after the first day of a week, I am assuming. Therefore the first week gets excluded because its first day is before the start date, and yet its last day is after the start date.
UPDATE:
Consider having:
$the_week = date('o-m-d', strtotime($today. ' + '. $week .' week'));
$the_week_last = date('o-m-d', strtotime($today. ($week +1) .' week'));
By the way, I would recommend you do a single SQL query for this, rather than one for every week. There is an example of how to do that here.

Answer 2

this is the output of your foreach loop for $the_week
2014-07-09
2014-07-16
2014-07-23
2014-07-30
2014-08-06
2014-08-13
2014-08-20
2014-08-27
2014-09-03
2014-09-10
2014-09-17
2014-09-24
2014-10-01
2014-10-08
2014-10-15
2014-10-22
2014-10-29
2014-11-05
2014-11-12
2014-11-19
as you can see the second one is outside of your date range
Try this as your loop
//$first = 0;
$last = 19;
//$weeks = range($first, $last);
$today = new \DateTime();
$today->modify('Monday this week');
for ($i=0; $i<$last; $i++) {
$the_week = $today->format('o-m-d');
$sql = mysql_query("SELECT startDate,endDate FROM work WHERE $the_week BETWEEN startData AND endDate"); //what happend to your original query.
$r = mysql_num_rows($sql);
$row = mysql_fetch_array($sql);
$startdate = $row['startDate'];
$enddate = $row['endDate'];
if(($startdate > $the_week) AND ($enddate < $the_week)) {
$color = "#69dd54;"; } else { $color = "#ffffff;";
}
echo "<span style='color: ". $color ."'>". $the_week ."</span>";
$today->modify('next Monday');
}
outputs
2014-07-07
2014-07-14
2014-07-21
2014-07-28
2014-08-04
2014-08-11
2014-08-18
2014-08-25
2014-09-01
2014-09-08
2014-09-15
2014-09-22
2014-09-29
2014-10-06
2014-10-13
2014-10-20
2014-10-27
2014-11-03
2014-11-10
Using DateTime you can increment by the 'next Monday' or any day for that matter, with a simple for loop.
also make sure to change
$startdate = $ro['startDate'];
$enddate = $ro['endDate'];
to
$startdate = $row['startDate'];
$enddate = $row['endDate'];