Online PHP editor | rfc for 5AtNl

@ 2015-04-14T11:57:48Z

<?php
// https://trello.com/jobs/windows-mobile-developer

$alphabet = 'acdegilmnoprstuw';

// test data
$hash = 680131659347;
$string = 'leepadg';
$task_hash = 696005871397;

echo sprintf('Hash of string «%s» is «%s».', $string, get_hash($alphabet, $string))
    , PHP_EOL
    , sprintf('String of hash «%s» is «%s».', $hash, get_string($alphabet, $hash))
    , PHP_EOL
    , sprintf('Solution for hash «%s» is «%s».', $task_hash, get_string($alphabet, $task_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 get_string($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 git.master, git.master_jit, rfc.property-hooks: Hash of string «leepadg» is «680131659347». String of hash «680131659347» is «leepadg». Solution for hash «696005871397» is «spartan».

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