3v4l.org

run code in 300+ PHP versions simultaneously

@ 2015-04-14T11:42:27Z

<?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;
            }
        }
        echo $result;
        return strrev($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, 5.5.0 - 5.5.38, 5.6.0 - 5.6.30, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.29 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: Hash of string «leepadg» is «680131659347». gString 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/Pljo3 on line 9 PHP_EOLgString of hash «680131659347» is «g».

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