添加最后 3 个产品进行比较 -> Laravel -PHP

Question

我想在我的比较页面中从 session 获得最后三个产品这是我的代码

class CompareController extends Controller 
{     
    public function index(Request $request)
    {
        if (App::isLocale('en')) {
            $language_id =  1;
        }else{
            $language_id =  4;
        }
       
        $data =   $request->products_id;
        $arr = Session::get('success');
        if( in_array( $data, $arr , TRUE )){
            return  $arr ;
        }else{
            Session::push('success',$data);
        }
    
        if(count($arr) > 3){
            array_shift($arr);
         }
         $product = DB::table('products')
                ->leftJoin('products_description','products_description.products_id','=','products.products_id')
                ->leftJoin('products_description','products_description.products_id','=','products.products_id')
                ->where('products_description.language_id','=', $language_id)
                ->whereIn('products.products_id',  $arr   )
                ->get();
    
        return view("website.layout.compare",compact('product'));
    }
    public function addToCompare(Request $request){
        
    }
   
}

Answer 1

您可以使用 array_slice ( https://www.php.net/manual/en/function.array-slice.php )

例子：

$input = array("a", "b", "c", "d", "e");

$output = array_slice($input, 2);      // returns "c", "d", and "e"
$output = array_slice($input, -2, 1);  // returns "d"
$output = array_slice($input, 0, 3);   // returns "a", "b", and "c"

对于您的问题：

$arr = [1,2,3,4,5]; // replace $arr with Session::get('success')

$output = array_slice($arr, -3,3)); // returns [3,4,5]