Array values as assoc array keys

Question

i wanted to fill an assoc array from variables from another array.

I have an array like this

$keys = array("key1", "key2", "key3");

and now i want to fill an array with these keys like this

$someArray["key1"]["key2"]["key3"] = "some value";

and of course it would work like this as well

$someArray[$keys[0]][$keys[1]][$keys[2]] = "some value";

But the number of keys may vary and they are different for each loop. I want to translate some data in a hierarchy structure.

So I would love to do this dynamically from the $keys array.

For now I create a Json String, push the decoded Json to $someArray and use array_merge on it - but i thought there should be a more elegant way.

Thank you guys

Barmar · Accepted Answer · 2015-01-31 13:19:26Z

1

Use a loop with a reference variable:

$someArray = array();
$where =& $someArray;
foreach (array_slice($keys, 0, -1) AS $key) {
    $where[$key] = array();
    $where =& $where[$key];
}
$where[$keys[count($keys)-1]] = "some value";

answered Jan 31, 2015 at 13:19

Barmar

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1 Comment

KddC Over a year ago

thank you so much - i had no idea what you use reference variables for so far :)

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