bdelespierre/php-phash

pHash implementation in PHP

v1.0.1 2020-08-20 22:23 UTC

Requires

• php: ~7.3
• intervention/image: ^2.5
• symfony/console: ^5.1

Requires (Dev)

• phpunit/phpunit: ^9.3

Suggests

• ext-gd: to use GD library based image processing.
• ext-imagick: to use Imagick based image processing.

MIT

• Benjamin Delespierre

• phash
• bdelespierre
• image hashing algorithm

README

Computes the pHash (Perceptive Hash) of an image to compare images.

Installation

You can install the package via composer:

composer require bdelespierre/php-phash

Usage

vendor/bin/phash generate <image>
vendor/bin/phash compare <image1> <image2>

require "vendor/autoload.php";

use Bdelespierre\PhpPhash\PHash;
use Intervention\Image\ImageManager;

$manager = new ImageManager(['driver' => 'imagick']);
$phash = new PHash($manager);

$hash = $phash->hash(new \SplFileInfo("image.jpg"));
$bash_hex = base_convert($bits, 2, 16);

echo $base_hex; // ffffef0001900000

Compare 2 hashes using Hamming Distance

$hash1 = $phash->hash(new \SplFileInfo("image1.jpg"));
$hash2 = $phash->hash(new \SplFileInfo("image2.jpg"));

$dist = 0;
for ($i = 0; $i < $size ** 2; $i++) {
    if ($hash1[$i] != $hash2[$i]) {
        $dist++;
    }
}

echo "Hamming distance is: {$dist}";

Testing

composer test

Changelog

Please see CHANGELOG for more information what has changed recently.

Contributing

Please see CONTRIBUTING for details.

Security

If you discover any security related issues, please email [e-mail] instead of using the issue tracker.

Credits

• Benjamin Delespierre
• All Contributors

License

The MIT License (MIT). Please see License File for more information.