Why this two variable's values remain the same after I change one of them?

Asked Dec 28 '17 at 17:06

Active Dec 28 '17 at 17:06

Viewed 27 times

I'm studying php and I made this code:

$a = new DateTime('NOW');

$b = $a;

$b->modify("+1 day");

echo "<pre>";

print_r($a);    

print_r($b);

And in both my print_r the results are the same, this:

DateTime Object
(
    [date] => 2017-12-29 15:05:27.000000
    [timezone_type] => 3
    [timezone] => America/Sao_Paulo
)
DateTime Object
(
    [date] => 2017-12-29 15:05:27.000000
    [timezone_type] => 3
    [timezone] => America/Sao_Paulo
)

Why is that?

asked Dec 28 '17 at 17:06

Stordon

2

Use $b = clone $a. In your code both variables point to one object – splash58 Dec 28 '17 at 17:07
Or refactor your code to use `DateTimeImmutable`, that's what it's there for – iainn Dec 28 '17 at 17:09
I see, thank you. Can you explain to me what exactly "point to one object" means, or give me a link where I can study about it? – Stordon Dec 28 '17 at 17:42

Why this two variable's values remain the same after I change one of them?

0 Answers0