Array mapping in PHP with keys

Question

Just for curiosity (I know it can be a single line foreach statement), is there some PHP array function (or a combination of many) that given an array like:

Answer 1

The easiest way is to use a LINQ port like YaLinqo library*. It allows performing SQL-like queries on arrays and objects. Its toDictionary function accepts two callbacks: one returning key of the result array, and one returning value. For example:

$userNamesByIds = from($users)->toDictionary(
    function ($u) { return $u->id; },
    function ($u) { return $u->name; }
);

Or you can use a shorter syntax using strings, which is equivalent to the above version:

$userNamesByIds = from($users)->toDictionary('$v->id', '$v->name');

If the second argument is omitted, objects themselves will be used as values in the result array.

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