root/trunk/lib/form/RegisterForm.class.php

<?php
/**
 * Member registration form
 *
 * @see sfGuardUserForm
 */
class RegisterForm extends BasesfGuardUserForm
{
  /**
   * Form configuration
   *
   */
  public function configure()
  {
    // widgets
    $this->setWidgets(array(
      'username'  => new sfWidgetFormInput(),
      'email'     => new sfWidgetFormInput(),
      'password'  => new sfWidgetFormInputPassword(),
      'password2' => new sfWidgetFormInputPassword(),
    ));

    // helps
    $this->widgetSchema->setHelps(array(
      'username'  => 'Your username should contains only alphanumeric, dash, dot or underscore characters, and begin with a letter.',
      'email'     => 'Please enter a valid email address. An activation link will be sent to this adress.',
      'password'  => 'Your password must be 6 characters length minimum.',
      'password2' => 'Please confirm your password for avoiding typos.',
    ));

    // validators
    $this->setValidators(array(
      'username'  => new sfValidatorAnd(array(
        new sfValidatorString(array('min_length' => 3, 'max_length' => 20)),
        new sfValidatorRegex(array('pattern' => '/^[a-zA-Z]([a-zA-Z0-9._-]+)$/'), array('invalid' => 'Name "%value%" contains forbidden characters')),
        new sfValidatorBlacklist(array('forbidden_values' => sfConfig::get('app_people_forbidden_names', array())), array('invalid' => 'Name "%value%" is blacklisted')),
      )),
      'email'     => new sfValidatorAnd(array(
        new sfValidatorString(array('max_length' => 100)),
        new sfValidatorEmail(),
      )),
      'password'  => new sfValidatorString(array('min_length' => 6, 'max_length' => 128)),
      'password2' => new sfValidatorString(array('min_length' => 6, 'max_length' => 128)),
    ));

    $this->addCaptcha();

    // post validator
    $this->validatorSchema->setPostValidator(new sfValidatorAnd(array(
      new sfValidatorSchemaCompare('password', 'equal', 'password2'),
      new sfValidatorPropelUnique(array('model'  => 'sfGuardUser', 'column' => 'username')),
      new sfValidatorPropelUnique(array('model'  => 'sfGuardUser', 'column' => 'email'))
    )));

    $this->widgetSchema->setNameFormat('user[%s]');
  }

  /**
   * Adds a captcha to current form, if enabled by configuration
   *
   */
  public function addCaptcha()
  {
    if (true === sfConfig::get('app_recaptcha_enabled'))
    {
      $this->widgetSchema['captcha']    = new sfWidgetFormReCaptcha(array('public_key' => sfConfig::get('app_recaptcha_public_key')));
      $this->validatorSchema['captcha'] = new sfValidatorReCaptcha(array('private_key' => sfConfig::get('app_recaptcha_private_key')));
      $this->widgetSchema->setHelp('captcha', 'This codes aims at detecting if you are a bot or a human person.');
    }
  }
}