in

Checks if the value exists in a list of given values

• kirby/src/Toolkit/V.php#L407

V::in($value, array $in, bool $strict = false): bool

Parameters

Name	Type	Default
$value *	mixed	–
$in *	array	–
$strict	bool	false

Return type

bool

In your code

if(V::in('A', ['A', 'B', 'C'])) {
  echo 'Yay, valid!';
}

In fields

fields:
  example:
    label: Example field
    type: text
    validate:
      in:
        - A
        - B
        - C