PHP userfriendly password generator (not very strong but really userfriendly and easy to remember) (using Yii framework)

FriendlyPassword.php

<?php
/**
 * @file protected/components/FriendlyPassword.php
 */

/**
 * Class FriendlyPassword
 *
 * Generates passwords like that: random_static_word + random_number + random_dynamic_word
 * 
 * Note: it is a component for web application based on Yii framework.
 *   Ask me if you need solution for other framework or in plain PHP.
 * 
 * @author pavel.volyntsev@gmail.com
 * @link http://copist.ru/
 * 
 * @usage $password = \Yii::app()->passgen->generate();
 */
class FriendlyPassword extends \CComponent
{
	public $staticWords = array();

	public $randomNumberMin = 11;

	public $randomNumberMax = 999;

	public $template = '{number}{static}{number}{dynamic}{number}';

	public function init() { }

	public function generate()
	{
		$self = $this;
		$password = preg_replace_callback('/(?:\{(static|number|dynamic)\})/', function($matches) use($self) {
				switch($matches[1])
				{
					case 'number':
						return $self->getNumber();
					case 'static':
						return $self->getStaticWord();
					case 'dynamic':
						return $self->getDynamicWord();
					default:
						return $matches[0];
				}
			}, $this->template);

		return $password;
	}

	/**
	 * Returns random word from static words list
	 * @return mixed
	 */
	public function getStaticWord()
	{
		return $this->staticWords[rand(0, count($this->staticWords)-1)];
	}

	/**
	 * Returns random number
	 * @return int
	 */
	public function getNumber()
	{
		return rand($this->randomNumberMin, $this->randomNumberMax);
	}

	/**
	 * Returns random word from database
	 * @return mixed
	 */
	public function getDynamicWord()
	{
		// one random word of length between 5 and 9 symbols in lowercase
		$queryString = <<<SQL
SELECT LOWER(t.`tag`)
FROM `tag` t
WHERE t.`tag` REGEXP '^[[:alpha:]]{5,9}$'
ORDER BY RAND()
LIMIT 1
SQL;
		$queryCommand = \Yii::app()->db->createCommand($queryString);
		return $queryCommand->queryScalar();
	}
}

main.php

<?php
/**
 * @file protected/config/main.php
 *
 * Main configuration file for Yii application
 */

return array(
	'components' => array(

	// ...
	'db' => array(
		// ... database connection required
	),

	'passgen' => array(
		'class' => 'application.components.FriendlyPassword',
		'staticWords' => include('../passgen_static_words.php'),
	),

 	// ...
);

passgen_static_words.php

<?php
/**
 * @ file protected/config/passgen_static_words.php
 *
 * Static words for passwords generator
 */

return array(
	'correct',
	'agly',
	'pretty',
	'good',
	'bad',
	// etc.
);

tag.sql

DROP TABLE IF EXISTS `tag`;

CREATE TABLE `tag` (
	`tag_id` INT(11) NOT NULL AUTO_INCREMENT,
	`tag` VARCHAR(255) NOT NULL,
	PRIMARY KEY (`tag_id`),
	UNIQUE INDEX `uk_tag_tag` (`tag`)
) COLLATE='utf8_general_ci' ENGINE=InnoDB AUTO_INCREMENT=0;

-- table `tag` dump
INSERT INTO `tag` (`tag`) VALUES ('battery'), ('horse'), ('staple'), ('private');