PHP Return Key Given Different Key in Array

Question

I have a unique problem.

I have a few arrays that each have 2 items and are in the following form:

$arr=Array
(
    [TEAM1] => 113.03
    [TEAM2] => 103.52
)

I am trying to create a function that given the array ($arr) and one of the keys (TEAM1), it would return the other key (TEAM2). The array will always only have 2 values and the key you put in will always exist.

My problem is that I have no idea how to start this.. if the key was 0 or 1 it would be easy selecting the other row but for this I am not sure how to start

$str = 'TEAM2'; $notTeam2 = array_diff_key($arr, [$str => null]); Demo — Mark Baker
– Mark Baker, Commented Sep 22, 2015 at 21:14
$result = preg_grep("/$key/", array_keys($arr), PREG_GREP_INVERT); — AbraCadaver
– AbraCadaver, Commented Sep 22, 2015 at 21:17
@MarkBaker: Your solution worked. If you post it as answer, ill approve it. Also how do I just return the value (i.e. 113.03) and not the whole array — Bijan
– Bijan, Commented Sep 22, 2015 at 21:24
unset $arr[$key]; reset($arr); $value = current($arr); should do it. — Ryan Vincent
– Ryan Vincent, Commented Sep 22, 2015 at 21:37

Mark Baker · Accepted Answer · 2015-09-22 21:31:59Z

1

To get the key that isn't $str:

$str = 'TEAM2';
$notTeam2 = array_diff_key($arr, [$str => null]);

Using array_dereferencing to get the value without needing to know the key:

$notTeam2Value = array_values($notTeam2)[0];

Demo

answered Sep 22, 2015 at 21:31

Mark Baker

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