Chequer is a Domain Specific Language and a set of functions to allow You to use it. It is host-agnostic by design, which makes it easely portable to different languages. Currently only PHP is available, with JavaScript port soon to follow.

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Use Composer package stamina/chequer-php to install.

php composer.phar require stamina/chequer-php

The minimum required PHP version is 5.3. Because 5.4 introduces the shorthand array syntax - this version is recommended and used in this documentation.

In a more traditional manner, you can add the Chequer library to you include path, or auto loader, as it is PSR-0 compliant. You can also use a single file Chequer.php, as long as you refrain from using typecasts.