Александр N++

<?php
namespace app\components;
use Yii;
use yii\base\InvalidConfigException;
use yii\helpers\ArrayHelper;
use yii\helpers\FileHelper;

class Theme extends \yii\base\Theme
{

    public $active;
    /**
     * @inheritdoc
     */
    public function applyTo($path)
    {

        $pathMap = ArrayHelper::getValue($this->pathMap,$this->active,$this->pathMap);

        if (empty($pathMap)) {
            if (($basePath = $this->getBasePath()) === null) {
                throw new InvalidConfigException('The "basePath" property must be set.');
            }
            $pathMap = [Yii::$app->getBasePath() => [$basePath]];
        }


        $path = FileHelper::normalizePath($path);
        foreach ($pathMap as $from => $tos) {
            $from = FileHelper::normalizePath(Yii::getAlias($from)) . DIRECTORY_SEPARATOR;
            if (strpos($path, $from) === 0) {
                $n = strlen($from);
                foreach ((array) $tos as $to) {
                    $to = FileHelper::normalizePath(Yii::getAlias($to)) . DIRECTORY_SEPARATOR;
                    $file = $to . substr($path, $n);
                    if (is_file($file)) {
                        return $file;
                    }
                }
            }
        }
        return $path;
    }
}

'view'=>[

            'theme' => [
                'class'=>'app\components\Theme',
                'active'=>'theme-default',
                'pathMap' => [
                    'theme-default' => [
                        '@app/views' => ['@app/themes/theme-default/views']
                    ],
                    'theme-dashboard' => [
                        '@app/views' => ['@app/themes/theme-dashboard/views']
                    ]
                ]
            ],
        ],

if(!empty($filePath)){
$model->image_url = $filePath
}

Также вопрос в том, куда ядро лучше ложить? В корень?
Использую advanced.

namespace app\extensions\components;
use yii\base\Application;
use yii\base\BootstrapInterface;
class AppBootstrap implements BootstrapInterface
{
    /**
    * Bootstrap method to be called during application bootstrap stage.
    * @param Application $app the application currently running
    */
    public function bootstrap(Application $app)
    {
                    // Подключаем файлик с функциями
    }
}

'bootstrap' => [
    'app\extensions\components\AppBootstrap',
],

<?php if(!Yii::$app->user->isGuest):?>
        <?=yii\helpers\Html::img( Yii::$app->user->getIdentity(true)->getAvatar() )?>
    <?php endif;?>

<?php
$jsCode=<<<'JS'
	$('.content').on('click','.fancybox', function(e) {
        $(this).fancybox();
    });
});
JS;
$this->registerJs($jsCode);
?>

$(document).ajaxStop(function() { 
		$('.fancybox').fancybox();
	});

<?php foreach($models as $i=>$item): ?>

               <?= $form->field($item,"[$i]name")->textInput(['maxlength' => 32]); ?>
                <?= $form->field($item,"[$i]price"); ?>
                <?= $form->field($item,"[$i]count"); ?>
                <?= $form->field($item,"[$i]description"); ?>
        <?php endforeach; ?>

if (Model::loadMultiple($models , Yii::$app->request->post()) && 
        Model::validateMultiple($models )) {
... }

<?php

namespace app\modules\dashboard;

class Module extends \yii\base\Module
{
    public $controllerNamespace = 'app\modules\dashboard\controllers';

    public function init()
    {
        parent::init();
        $theme = ''; // Yii::$app-> ... как-то тут можно вытащить название темы которая сейчас установлена
        $this->viewPath = '@app/themes/'.$theme.'/modules/'. $this->id ;
       
        // custom initialization code goes here
    }
}