<?php
 
error_reporting(-1);
mb_internal_encoding('utf-8');
 
$letters = explode(' ', "а б в г д е ё ж з и й к л м н о п р с т у ф х ц ч ш щ ъ ы ь ю я");
$translation = explode(' ', "1 2 3 4 5 6 7 8 9 0 ! @ # $ % ^ & * ( ) _ - + = [ ] { } ; : ' `");
$code = array_combine($letters, $translation);
 
$text = "нас предали, явка провалена.";
echo $cipher = strtr($text, $code) . "\n";
 
$decode = array_flip($code);
 
echo $cipher = strtr($text, $decode) . "\n";
 
// your code goes here

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