Hashids is small PHP library to generate YouTube-like ids from numbers. Use it when you don't want to expose your database ids to the user: http://hashids.org/php
Require this package, with Composer, in the root directory of your project.
$ composer require hashids/hashids
Then you can import the class into your application:
use Hashids\Hashids;
$hashids = new Hashids();
$hashids->encode(1);
Note: Hashids requires the BCMath extension in order to work. Optionally you can use the GMP extension.
use Hashids\Hashids;
$hashids = new Hashids();
$id = $hashids->encode(1, 2, 3); // o2fXhV
$numbers = $hashids->decode($id); // [1, 2, 3]
A few more ways to pass to encode()
:
use Hashids\Hashids;
$hashids = new Hashids();
$hashids->encode(1, 2, 3); // o2fXhV
$hashids->encode([1, 2, 3]); // o2fXhV
$hashids->encode('1', '2', '3'); // o2fXhV
$hashids->encode(['1', '2', '3']); // o2fXhV
Make your ids unique:
Pass a project name to make your ids unique:
use Hashids\Hashids;
$hashids = new Hashids('My Project');
$hashids->encode(1, 2, 3); // Z4UrtW
$hashids = new Hashids('My Other Project');
$hashids->encode(1, 2, 3); // gPUasb
Use padding to make your ids longer:
Note that ids are only padded to fit at least a certain length. It doesn't mean that your ids will be exactly that length.
use Hashids\Hashids;
$hashids = new Hashids(); // no padding
$hashids->encode(1); // jR
$hashids = new Hashids('', 10); // pad to length 10
$hashids->encode(1); // VolejRejNm
Pass a custom alphabet:
use Hashids\Hashids;
$hashids = new Hashids('', 0, 'abcdefghijklmnopqrstuvwxyz'); // all lowercase
$hashids->encode(1, 2, 3); // mdfphx
Encode hex instead of numbers:
Useful if you want to encode Mongo's ObjectIds. Note that there is no limit on how large of a hex number you can pass (it does not have to be Mongo's ObjectId).
use Hashids\Hashids;
$hashids = new Hashids();
$id = $hashids->encodeHex('507f1f77bcf86cd799439011'); // y42LW46J9luq3Xq9XMly
$hex = $hashids->decodeHex($id); // 507f1f77bcf86cd799439011
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When decoding, output is always an array of numbers (even if you encode only one number):
use Hashids\Hashids; $hashids = new Hashids(); $id = $hashids->encode(1); $hashids->decode($id); // [1]
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Encoding negative numbers is not supported.
-
If you pass bogus input to
encode()
, an empty string will be returned:use Hashids\Hashids; $hashids = new Hashids(); $id = $hashids->encode('123a'); $id === ''; // true
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Do not use this library as a security tool and do not encode sensitive data. This is not an encryption library.
The primary purpose of Hashids is to obfuscate ids. It's not meant or tested to be used as a security or compression tool. Having said that, this algorithm does try to make these ids random and unpredictable:
No repeating patterns showing there are 3 identical numbers in the id:
use Hashids\Hashids;
$hashids = new Hashids();
$hashids->encode(5, 5, 5); // A6t1tQ
Same with incremented numbers:
use Hashids\Hashids;
$hashids = new Hashids();
$hashids->encode(1, 2, 3, 4, 5, 6, 7, 8, 9, 10); // wpfLh9iwsqt0uyCEFjHM
$hashids->encode(1); // jR
$hashids->encode(2); // k5
$hashids->encode(3); // l5
$hashids->encode(4); // mO
$hashids->encode(5); // nR
This code was written with the intent of placing created ids in visible places, like the URL. Therefore, the algorithm tries to avoid generating most common English curse words by generating ids that never have the following letters next to each other:
c, f, h, i, s, t, u
Have a question? Ping me @IvanAkimov or ivanakimov.com
MIT License. See the LICENSE file. You can use Hashids in open source projects and commercial products. Don't break the Internet. Kthxbye.