frontend/components/SeoComponent.php

<?php
namespace frontend\components;
use Yii;
use yii\base\BootstrapInterface;
class SeoComponent implements BootstrapInterface
{
    public function bootstrap($app)
    {
        if(\Yii::$app->request->isGet) {
            \Yii::$app->on(\yii\base\Application::EVENT_BEFORE_REQUEST, function($event) {
                $array = ['%21'=>'!','%22'=>'"','%23'=>'#','%24'=>'$','%25'=>'%','%26'=>'&','%27'=>'\'','%28'=>'(','%29'=>')','%2a'=>'*','%2b'=>'+','%2c'=>',','%2d'=>'-','%2e'=>'.','%2f'=>'/','%3a'=>':','%3b'=>';','%3c'=>'<','%3d'=>'=','%3e'=>'>','%3f'=>'?','%40'=>'@','%5b'=>'[','%5c'=>'\\','%5d'=>']','%5e'=>'^','%5f'=>'_','%60'=>'`','%7b'=>'{','%7c'=>'|','%7d'=>'}','%7e'=>'~'];
                $url = mb_strtolower (\Yii::$app->request->url);
        
                $continue = true;
        
                foreach($array as $sym=>$sym_row){
                    if(strpos($url, $sym)){
                        $url = str_replace($sym, $sym_row, $url);
                        $continue = false;
                
                    }
                }
        
                if(!$continue){
                    \Yii::$app->getResponse()->redirect($url);
                }
            });
        }
        
        return $app;
    }
}