<?php
 
error_reporting(-1);
mb_internal_encoding('utf-8');
 
$text = "А роза упала на лапу Азора";
 
$trimmed = str_replace(' ', '', $text);
$lower = mb_strtolower($trimmed);
 
$reversed = "";
for ($i=0; $i<mb_strlen($lower); $i++) {
 
	$reversed .= mb_substr($lower, $i, 1);
}
 
echo "Если прочесть задом наперед, получится: \"$reversed\"\n";
 
($lower == $reversed) ?  $result = "Это палиндром" : $result = "Не палиндром";
echo $result;

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