PHP foreach that returns keys only

Question

Theoretical question that perhaps does not make any sense but still, maybe there is a clever answer.

I want to iterate through array and get its keys and to somethin

Answer 1

If you want to set all keys to certain value you can just do it this way:

$array = array(
        'foo'=> 'oldval1',
        'bar'=> 'oldval2',
        'baz'=> 'oldval3'
);

$other_array = array_fill_keys(array_keys($array), 'something');
print_r($other_array);

This will produce:

Array
(
    [foo] => something
    [bar] => something
    [baz] => something
)