Overview
Instructor has a built-in support for generating JSON Schema from
dynamic objects with Structure
class.
This is useful when the data model is built during runtime or defined
by your app users.
Structure
helps you flexibly design and modify data models that
can change with every request or user input and allows you to generate
JSON Schema for them.
Example
<?php
require 'examples/boot.php';
use Cognesy\Instructor\Extras\Structure\Field;
use Cognesy\Instructor\Extras\Structure\Structure;
use Cognesy\Polyglot\Inference\Enums\OutputMode;
use Cognesy\Polyglot\Inference\Inference;
$city = Structure::define('city', [
Field::string('name', 'City name')->required(),
Field::int('population', 'City population')->required(),
Field::int('founded', 'Founding year')->required(),
]);
$data = (new Inference)
->using('openai')
->with(
messages: [['role' => 'user', 'content' => 'What is capital of France? \
Respond with JSON data.']],
responseFormat: [
'type' => 'json_schema',
'description' => 'City data',
'json_schema' => [
'name' => 'city_data',
'schema' => $city->toJsonSchema(),
'strict' => true,
],
],
options: ['max_tokens' => 64],
mode: OutputMode::JsonSchema,
)
->asJsonData();
echo "USER: What is capital of France\n";
echo "ASSISTANT:\n";
dump($data);
assert(is_array($data), 'Response should be an array');
assert(isset($data['name']), 'Response should have "name" field');
assert(strpos($data['name'], 'Paris') !== false, 'City name should be Paris');
assert(isset($data['population']), 'Response should have "population" field');
assert(isset($data['founded']), 'Response should have "founded" field');
?>
Responses are generated using AI and may contain mistakes.