I want PHP to determine if a number is included in the value of a particular array.

Use of undefined constant A_CERTAIN_AREA_ARRAY-assumed 'A_CERTAIN_AREA_ARRAY' (this will throw an Error in a future version of PHP)

class TEST {
    const A_CERTAIN_AREA_ARRAY = [1,11,13];
    const A_CERTAIN_AREA_B_ARRAY = [2,22,23];
    const A_CERTAIN_AREA_C_ARRAY = [3,23,53];

    public function index (Request$request)
    {
        $testPosition=3;
        Log::debug(":."."test", in_array($testPosition, A_CERTAIN_AREA_ARRAY, true));
        return view ('index');
    }
}