Leverage Task Specific Systems

<?php
require 'examples/boot.php';

use Cognesy\Instructor\Extras\Sequence\Sequence;
use Cognesy\Instructor\StructuredOutput;

class ReasoningStep {
    public function __construct(
        public int $id,
        /** @var string[] */
        public array $rationale,
        /** @var int[] */
        public array $dependencies,
        public string $eval_string
    ) {}
}

class TaskSpecificReasoner {
    public function __invoke(string $query): mixed {
        $steps = $this->generateReasoningSteps($query);
        return $this->executeSteps($steps);
    }
    
    private function generateReasoningSteps(string $query): array {
        return (new StructuredOutput)->with(
            messages: [
                [
                    'role' => 'system', 
                    'content' => 'You are a world class AI who excels at generating reasoning steps to answer a question. Generate a list of reasoning steps needed to answer the question.

At each point you should either:
- declare a variable to be referenced later on
- combine multiple variables together to generate a new result that you should store in another variable

The final answer should be stored in a variable called $answer.

Use valid PHP syntax for variable assignments.'
                ],
                ['role' => 'user', 'content' => $query],
            ],
            responseModel: Sequence::of(ReasoningStep::class),
        )->get()->toArray();
    }
    
    private function executeSteps(array $steps): mixed {
        $code = [];
        foreach ($steps as $step) {
            $code[] = $step->eval_string;
        }
        
        $fullCode = "<?php\n" . implode("\n", $code) . "\nreturn \$answer;";
        
        $result = eval(substr($fullCode, 5));
        return $result;
    }
}

$result = (new TaskSpecificReasoner)(
    'If there are 3 cars in the parking lot and 2 more cars arrive, how many cars are in the parking lot after another 2 more arrive?'
);

dump($result);
?>