<?php

error_reporting(-1);

$text = "абвгде";
$result = "палиндром";

$text = mb_strtolower($text);
str_replace(" ","",$text);

$length = mb_strlen($text);
$halfLength = floor($length/ 2);

for ($i = 0; $i <= halfLength; $i++) {
	$beginningLine = mb_substr($text, $halfLength);
	$endingLine = mb_substr($text, -$halfLength);
}	
	if ($beginningLine == $endingLine) {
		echo " Результат: {$result}\n";		
	}