<?php
 
error_reporting(-1);
 
mb_internal_encoding('utf-8');
 
$text = "Нажал кабан на баклажан";
 
$text = mb_strtolower($text);
 
$text = str_replace(" ", "", $text);
 
$letters = mb_strlen($text);
 
$array = array();
 
for ($i=0; $i < $letters+1; $i++) {
    $letter = mb_substr($text, $i, 1); 
	$array[$i] = $letter;
}
 
$comparisson = "";
 
for ($i=$letters; $i > -1 ; $i--) { 
	$comparisson = $comparisson . $array[$i];
}
 
if ($text == $comparisson) {
	echo "Это палиндром";
} else {
	echo "Это не палиндром";
}
 
?>

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