php: Create an array with ascending date objects - php

Question

I would like to create an array which consists of ascending date objects. I tried the following code:
$dat=date_create_from_format("Y-m-d H:i:s", "2014-11-01 00:00:00");
for ($i=0; $i<=2; $i++) {
$ar[$i]=$dat;
$dat->modify('+1 day');
}
print_r($ar);
The result is three times the same date:
Array
(
[0] => DateTime Object
(
[date] => 2014-11-04 00:00:00.000000
[timezone_type] => 3
[timezone] => Europe/Berlin
)
[1] => DateTime Object
(
[date] => 2014-11-04 00:00:00.000000
[timezone_type] => 3
[timezone] => Europe/Berlin
)
[2] => DateTime Object
(
[date] => 2014-11-04 00:00:00.000000
[timezone_type] => 3
[timezone] => Europe/Berlin
)
)
But what I would like to get is:
Array
(
[0] => DateTime Object
(
[date] => 2014-11-01 00:00:00.000000
[timezone_type] => 3
[timezone] => Europe/Berlin
)
[1] => DateTime Object
(
[date] => 2014-11-02 00:00:00.000000
[timezone_type] => 3
[timezone] => Europe/Berlin
)
[2] => DateTime Object
(
[date] => 2014-11-03 00:00:00.000000
[timezone_type] => 3
[timezone] => Europe/Berlin
)
)
Someone has an idea? Probably a newbie-thing ;-)

Answer 1

As $dat is an obejct, all items in $ar store references to this object. So, when this object changes ($dat->modify()), all references immediately see this changes. To create different object, you can clone source object:
$dat = date_create_from_format("Y-m-d H:i:s", "2014-11-01 00:00:00");
for ($i = 0; $i <= 2; $i++) {
$ar[$i] = clone $dat;
$dat->modify('+1 day');
}
print_r($ar);
Here clone operator takes you current $dat object and makes a copy of it. So when you change $dat again, copy doesn't know about it.