Generate an array using DateInterval and DatePeriod for shifts - php

Question

I'm using DateInterval and DatePeriod to generate shifts in a medical application
$begin = new DateTime('2012-08-01 08:00');
$end = new DateTime('2012-08-01 12:00');
$interval = new DateInterval('PT45M');
$daterange = new DatePeriod($begin, $interval ,$end);
Those functions allow me to generate the following array
Array
(
[0] => 08:00
[1] => 08:45
[2] => 09:30
[3] => 10:15
[4] => 11:00
[5] => 11:45
)
Which functions and how could I do so the final array gets completed and chunked as this?
Array
(
[0] => Array
(
[0] => 08:00
[1] => 08:45
)
[1] => Array
(
[0] => 08:45
[1] => 09:30
)
[2] => Array
(
[0] => 09:30
[1] => 10:15
)
[3] => Array
(
[0] => 10:15
[1] => 11:00
)
[4] => Array
(
[0] => 11:00
[1] => 11:45
)
)
Thanks

Answer 1

$previous = null;
$dates = array();
foreach ($period as $dt) {
$current = $dt->format("H:i");
if (!empty($previous)) {
$show = new DateTime($current);
$dates[] = array($previous, $show->format('H:i'));
}
$previous = $current;
}

Answer 2

After retrieve your array using DateTime function. Just Plug n Play with the code. :)
$retrieveArray = array('08:00','08:45','09:30','10:15','11:00','11:45'); // Sample Array, Assumed mentioned in Question.
$final = array();
for ($i=0; $i < count($retrieveArray)-1; $i++) {
$j = $i+1;
$final[$i] = array($retrieveArray[$i], $retrieveArray[$j]);
}
Use var_dump($final); to check array result.
Desired Output
Array
(
[0] => Array
(
[0] => 08:00
[1] => 08:45
)
[1] => Array
(
[0] => 08:45
[1] => 09:30
)
[2] => Array
(
[0] => 09:30
[1] => 10:15
)
[3] => Array
(
[0] => 10:15
[1] => 11:00
)
[4] => Array
(
[0] => 11:00
[1] => 11:45
)
)
Edit:
To Add Last Shift
#jhon is right. It skips the last boundary value if it matches exactly the length of the interval.
As you need it, I suggest to ADD +1 min to your end time. It's a tweak/fix but server the purpose.
$begin = new DateTime('2012-08-01 08:00');
$end = new DateTime('2012-08-01 10:00');
$end = $end->modify( '+1 minute' ); // Tweak, to add last shift value.
$interval = new DateInterval('PT30M');
$daterange = new DatePeriod($begin, $interval ,$end);
To Check Output
foreach ( $daterange as $dt ){
echo '<pre>';
echo $dt->format( "H:i" );
echo '</pre>';
}
It is including last boundary value if it matches exactly the length of the interval.