How to Create Custom Component in Yii Framework

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1. Core Components
2. Custom Components

Yii::$app->componentID;

Core Application Components Examples

Yii::$app->db; //DB Component
Yii::$app->cache; //Cache Component
Yii::$app->request;
Yii::$app->session;
Yii::$app->mailer;

1. Create a folder named "components" in the project common folder.
2. Now create one class FullStackTutorialsComponent with extends class ‘Component’ inside the components folder.Using this component, we will display message.
3. Please see the below code to create a custom component class.

namespace common\components;

use Yii;
use yii\base\Component;
use yii\helpers\Html;

class FullStackTutorialsComponent extends Component{
 public $content;
 
 public function init(){
	parent::init();
	$this->content= 'Hello This is Default Message of Custom Component in Yii2';
 }
 
 public function display($content=null){
	if($content!=null){
		$this->content= $content;
	}
	echo Html::encode($this->content);
 }
 
}

4. Config Component In Yii2 We have to register 'FullStackTutorialsComponent' inside the common/config/main.php or common/config/main-local.php file.

 'components' => [
       'fullstacktutorials' => [
         'class' => 'common\components\FullStackTutorialsComponent',
       ],
],

5. Call Yii2 Custom Component Function in Yii Framework
Now we can access this component using ‘Yii::$app->fullstacktutorials’ expression

echo Yii::$app->fullstacktutorials->display('Congrats! This is your custom Component.');

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