soal palindrom

<?php
class Palindrome
{
    public static function isPalindrome($word)
    {
        $word = strtolower($word);
        $b = strrev($word);
        
        if($word == $b)
        {
            return true;
        }else
        {
            return false;
        }
    }
}

echo Palindrome::isPalindrome('Deleveled');