index.php

<? php
    
$message1 = "0@sn9sirppa@#?ia'jgtvryko1";
$message2 = "q8e?wsellecif@#?sel@#?setuotpazdsy0*b9+mw@x1vj";
$message3 = "aopi?sgnirts@#?sedhtg+p9l!";


$number1 = strlen($message1) / 2;
$number2 = strlen($message2) / 2;
$number3 = strlen($message3) / 2;


$subString1 = substr($message1, 5, $number1);
$subString2 = substr($message2, 5, $number2);
$subString3 = substr($message3, 5, $number3);


$subString1 = str_replace("@#?", ' ', $subString1);
$subString2 = str_replace("@#?", ' ', $subString2);
$subString3 = str_replace("@#?", ' ', $subString3);


$finalString1 = strrev($subString1);
$finalString2 = strrev($subString2);
$finalString3 = strrev($subString3);

echo $finalString1 . ' ' . $finalString2 . ' ' . $finalString3;