向新数组添加数组值：var_dump值消失后

Question

I am trying to add an array value to a new array like so:

$clientname[] = $cname['name'];

If I var_dump($cname['name']); then everything appears fine, but if I var_dump($clientname); I expect to see the same thing, but I don't, it appears as if I have done var_dump($cname);

The full code is here:

foreach($clientname as $client) {
                foreach($client as $cname) {
                var_dump($cname['name']);
                    $clientname[] = $cname['name'];
                    var_dump($clientname);
        }
        }

I have had to do the foreaches because of the array structure it is in, obviously the var_dump($cname['name']); repeats for the amount of $cnames there is as expected

What can be causing my $clientname to be a duplicate of $cname

Answer 1

So in the array you are looping through, you are adding values to itself?

In PHP, internally, it creates a copy of that array to loop through. So if you would dump the array after the foreach'es, you would see the new values in it.

Why are you adding those values to the same array? Could it be more convenient to create a new array and add them to that?

This is how PHP works in the example, but if you can clarify the problem you are trying to solve, there may be better ways to solve it.