Morton is a PHP implementation of Z-order curve.
Install the latest version with composer:
$ composer require aliance/morton
For completely tests running just call phpunit
command from ./vendor/bin
Aliance/Morton $ ./vendor/bin/phpunit
PHPUnit 6.1.3 by Sebastian Bergmann and contributors.
... 3 / 3 (100%)
Time: 115 ms, Memory: 4.00MB
OK (3 tests, 3 assertions)
This software is distributed under MIT license.