Yii Framework: label hint

Register.php

<?php

/**
 * Frontend Register class file.
 */
class Register extends User
{
	...
	
	public function attributeLabels()
	{
		$username = 'ユーザ名';
		$email = 'メールアドレス';
		$password = 'パスワード';
		$verifyPassword = 'パスワード(確認)';
		$verifyCode = '認証コード';
		
		// hint
		$format = Yii::app()->format;
		$usernameHint = $username.$format->hint('半角英数字で'.$this->usernameMinLength.'～'.$this->usernameMaxLength.'文字以内');
		$emailHint = $email.$format->hint('例: [email protected]');
		$passwordHint = $password.$format->hint('半角英数字で'.$this->passwordMinLength.'文字以上');
		$verifyCodeHint = $verifyCode.$format->hint('上に表示されている文字を入力してください');
		
		return compact(
			'username', 'email', 'password', 'verifyPassword', 'verifyCode',
			'usernameHint', 'emailHint', 'passwordHint', 'verifyCodeHint'
		);
	}
	
	...