yii コンポーネントをカスタマイズする方法

namespace common\components;
 
use Yii;
use yii\base\Component;
 
class ReadHttpHeader extends Component {
 
    public  function RealIP()
    {
        $ip = false;
 
        $seq = array('HTTP_CLIENT_IP',
                  'HTTP_X_FORWARDED_FOR'
                  , 'HTTP_X_FORWARDED'
                  , 'HTTP_X_CLUSTER_CLIENT_IP'
                  , 'HTTP_FORWARDED_FOR'
                  , 'HTTP_FORWARDED'
                  , 'REMOTE_ADDR');
 
        foreach ($seq as $key) {
            if (array_key_exists($key, $_SERVER) === true) {
                foreach (explode(',', $_SERVER[$key]) as $ip) {
                    if (filter_var($ip, FILTER_VALIDATE_IP) !== false) {
                        return $ip;
                    }
                }
            }
        }
    }
 
}

<?php
 
return [
    &#39;components&#39; => [
        &#39;ReadHttpHeader&#39; => [
            &#39;class&#39; => &#39;common\components\ReadHttpHeader&#39;
        ],
    ],
];

<?php
 
namespace frontend\controllers;
 
use Yii;
use yii\web\Controller; 
class BaseController extends Controller {
 
    protected $session = false;
 
    public function actions() {
        return [
                  &#39;error&#39; => [
                            &#39;class&#39; => &#39;yii\web\ErrorAction&#39;,
                  ],
        ];
    }
 
    public function init() {
 
        parent::init();
 
        // IP essential for prelim DDoS check
        if (!$this->cgS(&#39;UC-SEC.1a&#39;)) {
            $ip = Yii::$app->ReadHttpHeader->RealIP();
            echo $ip;
        }
    }
 
}