Use column values from one subarray as keys for anotheer subarray's values

Question

I have an object as below,

{"metaData":[{"name":"a"},{"name":"b"}],"rows":[[1,2],[3,4],[5,6]]}

I would like to change it to

[["a"=>1,"b"=>2],["a"=>4,"b"=>5],["a"=>5,"b"=>6]]

Is there any faster one liner that can convert this without going thru a loop in Laravel ?

Faster than what? Show us the code you've written. And by "faster", do you actually mean "faster to execute", or "uses fewer characters of source code", or "easier to read"? — IMSoP
– IMSoP, Commented Jun 8, 2022 at 14:07

Don't Panic · Accepted Answer · 2022-06-08 15:24:13Z

3

You can get the keys with array_column, then map array_combine over the rows.

$keys = array_column($object->metaData, 'name');
$result = array_map(fn($row) => array_combine($keys, $row), $object->rows);

You could make it a one-liner like this, but it's more difficult to read, and it will call array_column for every row instead of just once.

$result = array_map(fn($row) => array_combine(array_column($object->metaData, 'name'), $row), $object->rows);

You need to be sure that each row is the same size as the metadata array or array_combine will fail. Based on the appearance of your object, it looks like this would probably always be true, but it's important to note.

edited Jun 8, 2022 at 15:24

answered Jun 8, 2022 at 15:12

Don't Panic

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1 Comment

mickmackusa Over a year ago

Additional versions of the same advice: with array_walk() and with foreach()

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