Check Palindrome Word

palindrome.php

<?php
class Palindrome
{
    public static function isPalindrome($word)
    {
        if($word && is_string($word)){
            $word = strtolower($word);
            $wordReverse = strrev($word);

            $isPalindrome = $word==$wordReverse ? true : false;
        }else{
            $isPalindrome = false;
        }

        return $isPalindrome;
    }
}

echo Palindrome::isPalindrome('Deleveled');