I couldn't run isPalprime method in the challenge.

I spent one hour and looked php documents many times. I've tried various ways of if conditional. It didn't work.

I think maybe I misunderstood some aspects of the descriptions because my english isn't very well.

here is description of task 5 of 7

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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”.

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here is my code

<?php

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




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

echo " a palprime.";

?>` ` `