<?php
error_reporting(-1);
mb_internal_encoding('utf-8');

$text = "А роза упала на лапу Азора";

$text = str_replace(' ', '', $text);
$text = mb_strtolower($text);
$characters = preg_split("//u", $text);
$charactersRev = array_reverse($characters);
    if ($characters == $charactersRev) {
		echo "Палиндром";
	}
	else {
		echo "Не палиндром (:";
	}