Inverse of php array_column function?

Question

Given an array like

$x = array(array('a', 'aa'), array('b', 'bb'), array('c', 'cc'));

There is array_column that returns either

array_column($x, 0) === array('a', 'b', 'c')

or 

array_column($x, 1) === array('aa', 'bb', 'cc')

Now, is there an inverse? A function that would do:

array_putoneaftertheother(array('a', 'b', 'c'), array('aa', 'bb', 'cc')) === array(array('a', 'aa'), array('b', 'bb'), array('c', 'cc'))

None come to my mind...

It's pretty easy to implement, but I'm surprised that with so many array_* functions, PHP has no native version of this?!

A side note: I wouldn't really call it inverse of array_column(). array_column() returns a "vertical slice". Inverse/opposite of this would be a horizontal slice (or maybe everything except that column, but let's not go there), which is just $x[n]. What you described seems like rotating a 2D array, so rows become columns and columns become rows. — akinuri
– akinuri, Commented Feb 18, 2020 at 13:47
@akinuri I called this "inverse" because then array_column(array_putoneaftertheother($x, $y), 0) === $x so like f • g = Id meaning f function is g inverse. Opposite would be f•g=0 Tho you may indeed consider this as a transpose function of the array('a','b','c') vector — Xenos
– Xenos, Commented Feb 18, 2020 at 13:55

AbraCadaver · Accepted Answer · 2020-02-18 13:43:04Z

7

You can do multiple arrays with array_map and no callback:

$result = array_map(null, array('a', 'b', 'c'), array('aa', 'bb', 'cc'));

Or with one larger array the same way with Argument unpacking via ... (splat operator):

$result = array_map(null, ...array(array('a', 'b', 'c'), array('aa', 'bb', 'cc')));

edited Feb 18, 2020 at 13:43

answered Feb 18, 2020 at 13:37

AbraCadaver

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1 Comment

Xenos Over a year ago

Oh, indeed! I didn't got the "NULL [...] perform a zip operation on multiple arrays" of the doc, but I should have digged more into the examples, as this is the example #4 and #5 of doc php.net/manual/en/function.array-map.php Thanks !

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