$offset public property The offset between characters. Defaults

$maxLength public property The maximum length for randomly generated

$minLength public property The minimum length for randomly generated

$verifyCode public read-only property The verification

getVerifyCode() public method Gets the verification code

generateVerifyCode() protected method Generates a new

renderImage() protected method Renders the CAPTCHA image

generateValidationHash() public method Generates a hash

$foreColor public property The font color. For example, 0x55FF00

validate() public method Validates the input to see if