'1','b' => '2','c' => '3','d' => '4','e' => '5','f' => '6','g' => '7','h' => '8','i' => '9','j' => '10','k' => '11','l' => '12','m' => '13','n' => '14','o' => '15','p' => '16','q' => '17','r' => '18','s' => '19','t' => '20','u' => '21','v' => '22','w' => '23','x' => '24','y' => '25','z' => '26']; $text = 'we are betrayed, switch the line'; $cipher = strtr($text, $code); $numbers = array_flip($code); $decode = strtr($cipher, $numbers); echo "Original: {$text}
\nEnigma: {$cipher}
\n"; echo "Decode: {$decode}";