Allow only one set of data from foreach loop in Laravel-5.4 controller

How to allow only one set of data from an array in Laravel-5.4 controller:

foreach(Cart::content() as $cartitem) {
   if($cartitem->id === $id){
      do something....
   }
}

I want to take only the set of data from $cartitem when $cartitem->id === $id ($id is coming from request) and reject all other set of data from $cartitem. Set of data can be found anywhere (in any index) from the array.

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