<?php
echo strtoupper('Un message codé pour Indy');
echo "</br>" . "</br>" . "</br>" . "</br>";

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

$m1invers = substr($message1,5,13);
$m1invers2 = str_replace("@#?", " ", $m1invers);
$m2invers = substr($message2,5,23);
$m2invers2 = str_replace("@#?", " ", $m2invers);
$m3invers = substr($message3,5,13);
$m3invers2 = str_replace("@#?", " ", $m3invers);
//texte avant retournement

    echo 'Clef $message1 = ';
    echo strlen($message1)/2;
    echo "</br>";

    echo '$message1 = ';
    echo strrev($m1invers2);
    echo "</br>" . "</br>" . "</br>" . "</br>";

    echo 'Clef $message2 = ';
    echo strlen($message2)/2;
    echo "</br>";
    echo '$message2 = ';
    echo strrev($m2invers2);
    echo "</br>" . "</br>" . "</br>" . "</br>";

    echo 'Clef $message3 = ';
    echo strlen($message3)/2;
    echo "</br>";
    echo '$message3 = ';
    echo strrev($m3invers2);

?>