getSessionKey() protected method Returns the session variable

init() public method Initializes the action.

$fixedVerifyCode public property The fixed verification code.

renderImageByImagick() protected method Renders the CAPTCHA

$imageLibrary public property (available since version 2.0.7) The

run() public method Runs the action.

$padding public property Padding around the text. Defaults to

$testLimit public property How many times should the same CAPTCHA

renderImageByGD() protected method Renders the CAPTCHA

$transparent public property Whether to use transparent background