$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
validate() public method Validates the input to see if
$verifyCode public read-only property The verification
generateVerifyCode() protected method Generates a new
renderImage() protected method Renders the CAPTCHA image
$foreColor public property The font color. For example, 0x55FF00
getVerifyCode() public method Gets the verification code
generateValidationHash() public method Generates a hash
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