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: /mnt/lmsestudio-instance-vol002/lms_a852e4e4c22f/vendor/respect/validation/docs/rules/ [ drwxr-xr-x ]
name : 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 (`''`). ```php v::optional(v::alpha())->validate(''); // true v::optional(v::digit())->validate(null); // true ``` *** See also: * [NoWhitespace](NoWhitespace.md) * [NotBlank](NotBlank.md) * [NotEmpty](NotEmpty.md) * [NotOptional](NotOptional.md) * [NullType](NullType.md)