<?php
    $nb1 = "0@sn9sirppa@#?ia'jgtvryko1";
    $lengt1 = strlen($nb1)/2;
    echo $lengt1;
    $chaine = substr($nb1, 5, $lengt1);
    $replac1 = str_replace("@#?", ' ', $chaine);

    $nb2 = "q8e?wsellecif@#?sel@#?setuotpazdsy0*b9+mw@x1vj";
    $lengt2 = strlen($nb2)/2;
    echo $lengt2;
    $chaine2 = substr($nb2, 5, $lengt2);
    $replac2= str_replace("@#?", ' ', $chaine2);

    $nb3 = "aopi?sgnirts@#?sedhtg+p9l!";
    $lengt3  = strlen($nb3)/2;
    echo $lengt3;
    $chaine3 = substr($nb3, 5, $lengt3);
    $replac3 = str_replace("@#?", ' ', $chaine3);

    echo strrev($replac1), ' ';
    echo strrev($replac2), ' ';
    echo strrev($replac3), ' ';
?>