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# LTI 1.3 Tool Library
A library used for building IMS-certified LTI 1.3 tool providers in PHP.
This library is a fork of the [packbackbooks/lti-1-3-php-library](https://github.com/packbackbooks/lti-1-3-php-library), patched specifically for use in [Moodle](https://github.com/moodle/moodle).
It is currently based on version [5.1.0 of the packbackbooks/lti-1-3-php-library](https://github.com/packbackbooks/lti-1-3-php-library/releases/tag/v5.1.0) library.
The following changes are included so that the library may be used with Moodle:
* Replace the phpseclib dependency with openssl equivalent call in public key generation code.
* Replace the Guzzle dependency with generic HTTP client interfaces for client, response, exception.
* Small fix to http_build_query() calls, which now explicitly include the '&' arg separator param, for compatibility with applications that override PHP's arg_separator.output value via an ini_set() call, like Moodle does.
* Upgrade the firebase/php-jwt requirement from ^5.2 to ^6.0, to match Moodle's shipped version of the lib. This change can be dropped when [this upstream issue](https://github.com/packbackbooks/lti-1-3-php-library/pull/46) is merged.
Please see the original [README](https://github.com/packbackbooks/lti-1-3-php-library/blob/master/README.md) for more information about the upstream library.