In PHP, how do you change the key of an array element?

Question

I have an associative array in the form key => value where key is a numerical value, however it is not a sequential numerical value. The key is actually an ID number and the value is a count. This is fine for most instances, however I want a function that gets the human-readable name of the array and uses that for the key, without changing the value.

I didn't see a function that does this, but I'm assuming I need to provide the old key and new key (both of which I have) and transform the array. Is there an efficient way of doing this?

Answer 1

You could use a second associative array that maps human readable names to the id's. That would also provide a Many to 1 relationship. Then do something like this:

echo 'Widgets: ' . $data[$humanreadbleMapping['Widgets']];

Answer 2

$arr[$newkey] = $arr[$oldkey];
unset($arr[$oldkey]);