Palindrome in php

<?php

function palindrome($input) {
    $middle = strlen($input) / 2;
    $firstHalf = substr($input, 0, floor($middle));
    $secondHalf = substr($input, ceil($middle));
    return $firstHalf == strrev($secondHalf);
}

echo palindrome("racecar") ? "Palindrome" : "Not a palindrome";

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