decrypt.php

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

$keyNumber1 = strlen( $messages[0] ) / 2;
$subString1 = substr ($messages[0] , 5 , $keyNumber1);
$spaceAdded1 = str_replace("@#?", " ", $subString1);
$decryptedMessage1 = strrev($spaceAdded1);
echo '$decryptedMessage1 : ' . $decryptedMessage1 . nl2br("\n");

$keyNumber2 = strlen( $messages[1] ) / 2;
$subString2 = substr ($messages[1] , 5 , $keyNumber2);
$spaceAdded2 = str_replace("@#?", " ", $subString2);
$decryptedMessage2 = strrev($spaceAdded2);
echo '$decryptedMessage2 : ' . $decryptedMessage2 . nl2br("\n");

$keyNumber3 = strlen( $messages[2] ) / 2;
$subString3 = substr ($messages[2] , 5 , $keyNumber3);
$spaceAdded3 = str_replace("@#?", " ", $subString3);
$decryptedMessage3 = strrev($spaceAdded3);
echo '$decryptedMessage3 : ' . $decryptedMessage3 . nl2br("\n");