I don't think "?" at the beginning is fully enough for the Nullable Type
use case.
You can easily express a "null or an array of elements that must be string"
with "?string[]". But how can you express "an array of elements that must
be string or null" ?
In code that would be:
/**
* @param ?string[] $strings
*/
function nullOrArrayOfString(?array $strings) {
}
/**
* @param WHAT SHOULD I WRITE HERE ? $stringsOrNulls
*/
function arrayOfStringOrNull(array $stringsOrNulls) {
}
nullOrArrayOfString(null);
nullOrArrayOfString(['foo', 'bar']);
nullOrArrayOfString(['foo', null]); // Invalid call !
arrayOfStringOrNull(null); // Invalid call !
arrayOfStringOrNull(['foo', 'bar']);
arrayOfStringOrNull(['foo', null]);
I think something like "(?string)[]" would be necessary to cover all null
cases.
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