Contents

<?php

function encode($string)
{
    $a_z = range('a', 'z');
    $z_a = range('z', 'a');
    $string = preg_replace("/[^a-z0-9]+/", "", strtolower($string));
    $len = strlen($string);

    $count = 0;
    $encoded = [];
    foreach (str_split($string) as $char) {
        $count++;
        if (is_numeric($char)) {
            $encoded[] = $char;
        }
        if (ctype_lower($char)) {
            $encoded[] = $z_a[array_search($char, $a_z)];
        }
        if ($count % 5 == 0 && $count < $len) {
            $encoded[] = ' ';
        }
    }

    return implode('', $encoded);
}

Version data entries

396 entries across 396 versions & 1 rubygems

Version	Path
trackler-2.2.1.180	tracks/php/exercises/atbash-cipher/example.php
trackler-2.2.1.179	tracks/php/exercises/atbash-cipher/example.php
trackler-2.2.1.178	tracks/php/exercises/atbash-cipher/example.php
trackler-2.2.1.177	tracks/php/exercises/atbash-cipher/example.php
trackler-2.2.1.176	tracks/php/exercises/atbash-cipher/example.php
trackler-2.2.1.175	tracks/php/exercises/atbash-cipher/example.php
trackler-2.2.1.174	tracks/php/exercises/atbash-cipher/example.php
trackler-2.2.1.173	tracks/php/exercises/atbash-cipher/example.php
trackler-2.2.1.172	tracks/php/exercises/atbash-cipher/example.php
trackler-2.2.1.171	tracks/php/exercises/atbash-cipher/example.php
trackler-2.2.1.170	tracks/php/exercises/atbash-cipher/example.php
trackler-2.2.1.169	tracks/php/exercises/atbash-cipher/example.php
trackler-2.2.1.167	tracks/php/exercises/atbash-cipher/example.php
trackler-2.2.1.166	tracks/php/exercises/atbash-cipher/example.php
trackler-2.2.1.165	tracks/php/exercises/atbash-cipher/example.php
trackler-2.2.1.164	tracks/php/exercises/atbash-cipher/example.php
trackler-2.2.1.163	tracks/php/exercises/atbash-cipher/example.php
trackler-2.2.1.162	tracks/php/exercises/atbash-cipher/example.php
trackler-2.2.1.161	tracks/php/exercises/atbash-cipher/example.php
trackler-2.2.1.160	tracks/php/exercises/atbash-cipher/example.php