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robohash.org provider for Faker.
Install RoboHashProvider via Composer.
$ composer require phpmedia/faker-robohash-provider
$faker = Faker\Factory::create();
$faker->addProvider(new Phpmedia\RoboHashProvider($faker));
// normal roboter-avatar
$avatarUrl = $faker->avatarUrl('100x100','dummy'); // http://robohash.org/dummy.png?size=100x100
$avatarUrl = $faker->avatarUrl('50x50','dummy2','gif'); // http://robohash.org/dummy2.gif?size=50x50
// roboter-avatar from set 2 with background 1
$avatarUrl = $faker->avatarUrl('100x100', 'dummy', 'gif', 'set2', 'bg1') // http://robohash.org/dummy.gif?size=100x100&set=set2&bgset=bg1