yiiapi/framework/web/widgets/captcha/CCaptchaAction.php

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<?php

/**
 * CCaptchaAction class file.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @link http://www.yiiframework.com/
 * @copyright 2008-2013 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

/**
 * CCaptchaAction renders a CAPTCHA image.
 *
 * CCaptchaAction is used together with {@link CCaptcha} and {@link CCaptchaValidator}
 * to provide the {@link http://en.wikipedia.org/wiki/Captcha CAPTCHA} feature.
 *
 * You must configure properties of CCaptchaAction to customize the appearance of
 * the generated image.
 *
 * Note, CCaptchaAction requires PHP GD2 extension.
 *
 * Using CAPTCHA involves the following steps:
 * <ol>
 * <li>Override {@link CController::actions()} and register an action of class CCaptchaAction with ID 'captcha'.</li>
 * <li>In the form model, declare an attribute to store user-entered verification code, and declare the attribute
 * to be validated by the 'captcha' validator.</li>
 * <li>In the controller view, insert a {@link CCaptcha} widget in the form.</li>
 * </ol>
 *
 * @property string $verifyCode The verification code.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @package system.web.widgets.captcha
 * @since 1.0
 */
class CCaptchaAction extends CAction
{
	/**
	 * The name of the GET parameter indicating whether the CAPTCHA image should be regenerated.
	 */
	const REFRESH_GET_VAR='refresh';
	/**
	 * Prefix to the session variable name used by the action.
	 */
	const SESSION_VAR_PREFIX='Yii.CCaptchaAction.';
	/**
	 * @var integer how many times should the same CAPTCHA be displayed. Defaults to 3.
	 * A value less than or equal to 0 means the test is unlimited (available since version 1.1.2).
	 */
	public $testLimit = 3;
	/**
	 * @var integer the width of the generated CAPTCHA image. Defaults to 120.
	 */
	public $width = 120;
	/**
	 * @var integer the height of the generated CAPTCHA image. Defaults to 50.
	 */
	public $height = 50;
	/**