Question

Possible Duplicate:
How check any value of array exist in another array php?

I am creating a shopping site. To simplify, I have 2 arrays, one holds all my items and the other holds all the items that are added on the cart :

$Items

Array
(
    [0] => stdClass Object
        (
            [id] => 1
            [title] => Verity soap caddy
            [price] => 6.00
        )

    [1] => stdClass Object
        (
            [id] => 2
            [title] => Kier 30cm towel rail
            [price] => 14.00
        )
      //a lot more
)

$cartItems

Array
(
    [0] => Array
        (
            [rowid] => c4ca4238a0b923820dcc509a6f75849b
            [id] => 1
            [qty] => 1
            [price] => 6.00
            [name] => Verity soap caddy
            [subtotal] => 6
        )
)

I would like to loop through the $cartItems and add a class (identify) if an item is also in the cart. This is how I tried to do it

foreach($items as $items){
  if($cartItems[$items->id]['id']){
    echo '<h1 class="inCart">'. $item->title . '</h1>' //...
   }else{
    echo '<h1>'. $item->title . '</h1>' //...
   }
}

The above code does not work – even though $cartItems[0]['id'] would return what I need. My thinking is, whilst looping through $items, check if the similar id exists in the $cartItems array. I also tried to add $cartItems[$i]['id'] and increment $i within the loop, and that did not work.
Of course the html output that I wanted to get is (simplified)

<h1 class="IsOnCart"> Item Title</h1>
<h1> Item Title</h1>
<h1 class="IsOnCart"> Item Title</h1>
<h1> Item Title</h1>

Is there a way to implement this?
Thanks

Answer 1

$intersection = array_intersect($arr1, $arr2);
if (in_array($value, $intersection)) {
    // both arrays contain $value
}