Code Challenge: Objects

I don't think you type in a static 17 even though it passes. I think the idea is you're supposed to concatenate that with the variable that holds the value so you don't repeat yourself (DRY).

this passes:

<?php

include('class.palprimechecker.php');
$checker = new PalprimeChecker();
$checker->number = 17;

echo "The number " . $checker->number;
if($checker->isPalprime()){
    echo "is";
}else{
    echo "is not";
}
echo " a palprime.";

?>

I need help on the 5 of 7 task the question goes:

PalprimeChecker objects have a method called isPalprime(). This method does not receive any arguments. It returns true if the number property contains a palprime, and it returns false if the number property does not contain a palprime. (Tip: 17 is not a palprime.) Turn the second echo statement into a conditional that displays “is” or “is not” appropriately. The conditional should call the isPalprime method of the $checker object. If the isPalprime method returns true, then echo “is”; otherwise, echo “is not”.

this is my answer

<?php include("class.palprimechecker.php");


$checker = new PalprimeChecker;
$checker -> number = 17;

if($checker -> isPalprime()){
echo "is ";
} else {
echo "is not ";
}

echo "The number 17 ";

echo "a palprime.";

?>

this is wrong but it tells me:

It seems like you are calling the right method and you have the removed various placeholder characters (##|()), but something in the output is not quite right. Please double-check the preview.

I'm sort of confused on what I'm doing wrong.