movim_ynh/sources/vendor/respect/validation/docs/Optional.md

Optional

• v::optional(v $rule)

Validates if the given input is optional or not. By optional we consider null or an empty string ('').

v::optional(v::alpha())->validate(''); // true
v::optional(v::digit())->validate(null); // true

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See also:

• NoWhitespace
• NotBlank
• NotEmpty
• NotOptional
• NullType