[Wiki] Yii shorten common functions with OOP style

<?php
 
// default function
Yii::app()->user();
// => new OOP shorten function
Hp::user();
 
// default function
Yii::app()->clientScript;
// => new OOP shorten function
Hp::cs();
 
// default function
Yii::app()->params['name'];
// => new OOP shorten function
Hp::param('name');
 
/*
// parameters as array
    'key' => array(
        'leve1_key1' => 'level 1 value 1',
        'level1_key2' => array(
                            'level2_key1' => 'values 1',
                            'level2_key2' => 'values 2',
                        ),
    ),
*/
// =>
Hp::param('key', "level1_key2", "level2_key1");
// ...

<?php
 
class Hp 
{
    /**
     * Get the current user
     * @return WebUser
     */
    public static function user() {
        return Yii::app()->user;
    }
 
    /**
     * Get the current request
     * @return CHttpRequest
     */
    public static function request() {
        return Yii::app()->request;
    }
 
    /**
     * Get the current client script
     * @return client script
     */
    public static function cs() {
        return Yii::app()->clientScript;
    }
 
    /**
     * A shorthand method for getting the AssetManager 
     */
    public static function am() {
        return Yii::app()->getAssetManager();
    }
 
    /**
     * A shorthand method for getting value of a param
     * @return mixed
     */
    public static function param() {
        $value = Yii::app()->params[func_get_arg(0)];
        $totalArgs = func_num_args();
        if ($totalArgs > 1) {
            $i = 1;
            do {
                $value = $value[func_get_arg($i)];
                $i++;                
            } while ($i < $totalArgs);
        }
        return $value;
    }
 
    /**
     * An extend method for the built-in md5
     * @return string 32 bytes string
     */
    public static function md5($str) {
        if ($str)
            $str = md5($str . self::param('salt'));
        return $str;
    }
 
    /**
     * Get website's base url
     * @return string
     */
    public static function baseUrl() {
        return Yii::app()->request->baseUrl;
    }
 
    /**
     * Get website's theme url
     * @return string
     */
    public static function themeUrl() {
        return Yii::app()->theme->baseUrl;
    }
 
    /**
     * A shorthand method for creating absolute app urls
     * @param string $route
     * @param array $params
     * @return string 
     */
    public static function url($route, $params = array()) {
        return Yii::app()->createAbsoluteUrl($route, $params);
    }
 
}