A palindrome is a word, number, phrase, or other sequence of characters which reads the same backward as forward, such as madam or racecar or the number 10801.

palindrome.php

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

echo Palindrome::isPalindrome('Hannah');