Invalid argument supplied for foreach() in my close to a shopping cart

Yii 2.0 Tips, Snippets and Tutorials
1

Hello! I try to make something like a shopping cart, but i have the error from the title.

This is my controller, i suppose i did something wrong on the findBook function, but i don’t see what it is.

    <?php
    namespace frontend\modules\library\controllers;
    use Yii;
    class BookcollectionController extends \yii\web\Controller
    {
    	public $totalBooks = 0;

        public function actionAdd($id = null)
        {
        	if (!intval ($id) || empty ($id)){
        		Yii::$app->session->setFlash('error', 'Cannot find this book');
        		return $this->redirect(['/library']);
        	}

        	if(!isset(Yii::$app->session['bookcollection'])) {
        		//nicio colectie creata
    			Yii::$app->session['bookcollection'] = [];
    			Yii::$app->session['total_books'] = 0;
    		}
    		$this->addtobookcollection($id);

            return $this->redirect(['index']); //ma intorc la index, de modificat sa ma intorc la carte pe care eram
        }

        public function addtobookcollection($id)
        {
        	if (isset(Yii::$app->session['bookcollection'] [$id])){ //daca exista prdusul adauga 1
        		$session = Yii::$app->session['bookcollection'];
        		$session[$id] = $session[$id] +=1;
        		Yii::$app->session['bookcollection'] = $session;
        	}else {// daca produsul nu exista, ramane la 1
        		$session = Yii::$app->session['bookcollection'];
        		$session[$id] = 1;
        		Yii::$app->session['bookcollection'] = $session;
        	}
        }

        public function setTotal()
        {
        	Yii::$app->session['total_books'] = $this->totalBooks(Yii::$app->session['bookcollection']);

        	$this->totalBooks = Yii::$app->session['total_books'];
        }

        public function totalBooks($bookcollection)
        {
        	$totalBooks = 0;
        	if(is_array($bookcollection)) {
        		foreach ($bookcollection as $id => $qty) {
        			$totalBooks += $qty;
        		}
        		return $totalBooks;
        	}
        }

        public function findBook($id)
        {
        	return Book::findOne($id);
        }

        public function updateCollection()
        {
        	foreach (Yii::$app->session['bookcollection'] as $id => $qty) {
        		if(isset($_POST[$id])) {
        			if($_POST[$id] == 0){
        			$session = Yii::$app->session['bookcollection'];
        			unset ($session[$id]);
        			Yii::$app->session['bookcollection'] = $session;
        		} else {
        			$bookcollection = Yii::$app->session['bookcollection'];
        			$bookcollection[$id] = $_POST[$id];
        			Yii::$app->session['bookcollection'] = $bookcollection;
        		}
        	}
        }
    }

        public function actionIndex()
        {
        	if(!isset(Yii::$app->session['bookcollection']) || empty(Yii::$app->session ['bookcollection'])) {
        		Yii::$app->session->setFlash('error', 'Empty collection');
        		return $this->redirect (['site/index']);
        	}
        	$this->updateCollection();
        	$this->setTotal();

            return $this->render('/bookcollection/index');
        }

    }

The foreach code from the module index:

    <?php foreach(Yii::$app->seassion['bookcollection'] as $id => $qty) {
    				$book = $this->context->findBook($id);
    			}
    			?>

I know i will look lazy, but i can’t see what i am doing wrong. Any tips?

1 Like
2

The error should have file and line number so you should know for sure which foreach is it about. Doesn’t seem it’s about the one in the code you’ve posted since you have a check there.

btw., you have an error in totalBooks. It won’t return 0 in case collection isn’t an array.

3

The error came from bookcollection\index.php that’s the file and from the line 17 that contain:
<?php foreach(Yii::$app->seassion[‘bookcollection’] as $id => $qty) {

4

I can see that you are consistently misspelling session.
You write seassion instead, so you will get “not an object” errors.

1 Like
5

Thank you a lot! That was the source of my problem.