php - Respect\Validation - validate string if not empty, otherwise return true -


i'm using respect\validation validate fields. of fields not mandatory, phone number, if not empty must validated. following current code:

v::phone()->validate($phonenumber); // should return true if $phonenumber empty

how it?

based on the docs, looks should be:

v::optional(v::phone())->validate($phonenumber);

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