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@ 2015-04-14T11:38:18Z

<?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 = '';
    $len = strlen($letters);
    while ($res > 7) {
        for ($i = 0; $i < $len; $i++) {
            $newres = ($res - $i) / 37;
            if (is_int($newres)) {
                $result .= $letters[$i];
                $res = $newres;
                break;
            }
        }
        
        return strrev($result);
    }
}

Output for git.master, git.master_jit, rfc.property-hooks: Hash of string «leepadg» is «680131659347». Warning: Undefined variable $letters in /in/Hbl18 on line 25 Deprecated: strlen(): Passing null to parameter #1 ($string) of type string is deprecated in /in/Hbl18 on line 25 Warning: Undefined variable $res in /in/Hbl18 on line 26 String of hash «680131659347» is «».

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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