Get keys before and after specific value in array (in PHP)

Question

I want to get the value before and after a specific value of an array in PHP.

For example I have:

$array = (441, 212, 314, 406);

And my $specific_value is 441.

In this example I should get the before (406) and after (212).

If my value is 212 I should be get the before (441) and after (314).

Answer 1

Solution using array_search function:

$array = [441, 212, 314, 406];
$val = 441;

$currentKey = array_search($val, $array);

$before = isset($array[$currentKey - 1]) ? $array[$currentKey - 1] : $array[count($array) - 1];
$after = isset($array[$currentKey + 1]) ? $array[$currentKey + 1] : $array[0];

var_dump($before, $after);

The output:

int(406)
int(212)

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http://php.net/manual/en/function.array-search.php