validators\StringValidator $length

Specifies the length limit of the value to be validated. This can be specified in one of the following forms:

• an integer: the exact length that the value should be of;
• an array of one element: the minimum length that the value should be of. For example, [8]. This will overwrite $min.
• an array of two elements: the minimum and maximum lengths that the value should be of. For example, [8, 128]. This will overwrite both $min and $max.

See also:

• $tooShort for the customized message for a too short string.
• $tooLong for the customized message for a too long string.
• $notEqual for the customized message for a string that does not match desired length.