How to check that value exist in YII Session Variable - php

Question

I am using yii and creating a cart, by using id of product i need to check that id already exists or not , but i use in_array and array_key_exists but unable to solve it Here is my code of controller
public function actionCartupdateajax() {
//start yii session
$session = Yii::app()->session;
// get posted values
$id = isset($_POST['id']) ? $_POST['id'] : "";
$name = isset($_POST['name']) ? $_POST['name'] : "";
$price = isset($_POST['price']) ? $_POST['price'] : "";
$imgSrc = Yii::app()->request->baseUrl . '/images/icondeletecart.png';
/*
* check if the 'cart' session array was created
* if it is NOT, create the 'cart' session array
*/
if (!isset($session['cart_items']) || count($session['cart_items']) == 0) {
Yii::app()->session['cart_items'] = array();
}
/*
* Here is the proble
* check if the item is in the array, if it is, do not add
*/
if (in_array($id, Yii::app()->session['cart_items'])) {
echo 'alreadyadded';
} else {
Yii::app()->session['cart_items'] = $id;
echo '<li><strong>' . $name . '</strong><span>' . $price . '</span>'
. '<img src=' . $imgSrc . ' alt="No Image" class="imagedeletecart" id=' . $id . '></li>';
}
}
and the error in console is
in_array() expects parameter 2 to be array, string given

Answer 1

I think problem in next row:
Yii::app()->session['cart_items'] = $id;
After this code cart_items will be NOT array, but integer or string.
Clear session and try to change:
Yii::app()->session['cart_items'][] = $id;
And better use CHtml for generation html. It is cleaner. Like this:
echo CHtml::tag('li', array(/*attrs*/), 'content_here');
//your code
echo '<li><strong>' . $name . '</strong><span>' . $price . '</span>'
. '<img src=' . $imgSrc . ' alt="No Image" class="imagedeletecart" id=' . $id . '></li>';
//I propose this way(but you can use your version):
echo CHtml::tag(
'li',
array(),
CHtml::tag(
'strong',
array(),
'name'
) . CHtml::tag(
'span',
array(),
'price'
) . CHtml::image(
'src',
'alt',
array(
'class' => 'imagedeletecart',
'id' => 'id'
)
)
);