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public function actionCreate($event_id = null)
{
	if($event_id) {
		$model = new RegBattle(['event_id'=>$event_id]) //event_id получаем из get запроса
	} else {
		// ... другое
	}
        

}

type (default: 'GET')

Type: String
An alias for method. You should use type if you're using versions of jQuery prior to 1.9.0.

['param', 'integer', 'min' => '1', 'max' => '9', 'when' => function($m) {
    return $m->param == 'sku_max'; 
}],

$result = '<div class="board-article__tags-bar tags-bar">
      <div class="tags-wrap">
        <?php
        foreach ($item_tags as $tag) {
          echo '<a href="/' . $material_alias . '?tag=' . $tag->name . '" class="tag label label-success">' . $tag->name . '</a>';
        }
        ?>
      </div>
    </div>';

// webpack.config.js

module.exports = {
    entry: {
        "name1111": "./js/file1.js",
        "sobaka912": "./js/file2.js",
    },
    output: {
        path: path.join(__dirname, './dist/js'),
        filename: "[name].js"
    },
};