Online PHP editor | output for rKhDj

@ 2015-04-14T11:40:29Z

<?php

define('ALPHABET', 'acdegilmnoprstuw');

$hash = 680131659347;
$string = 'leepadg';

echo sprintf('Hash of string «%s» is «%s».', $string, get_hash(ALPHABET, $string)), PHP_EOL
    , sprintf('String of hash «%s» is «%s».', $hash, unhash(ALPHABET, $hash))
;



function get_hash($alphabet, $string) {
    $h = 7;
    $len = strlen($string);
    for($i = 0; $i < $len; $i++) {
        $h = ($h * 37 + strpos($alphabet, $string[$i]));
    }
    return $h;
}

function unhash($alphabet, $hash) {
    $result = '';
    $len = strlen($alphabet);
    while ($hash > 7) {
        for ($i = 0; $i < $len; $i++) {
            $newres = ($hash - $i) / 37;
            if (is_int($newres)) {
                $result .= $alphabet[$i];
                $hash = $newres;
                break;
            }
        }
        
        return strrev($result);
    }
}

Output for 4.3.10 - 4.3.11, 4.4.0 - 4.4.9, 5.0.2 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4, 8.3.6: Hash of string «leepadg» is «680131659347». String of hash «680131659347» is «g».
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Hash of string «leepadg» is «680131659347». String of hash «680131659347» is «g».
Output for 4.3.0 - 4.3.9, 5.0.0 - 5.0.1: Hash of string «leepadg» is «680131659347». Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/rKhDj on line 9 PHP_EOLString of hash «680131659347» is «g».

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