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Overview

This example enables the default EventLog JSONL sink for a plain inference request, then reads the resulting log file and prints the captured entries. Key concepts:
  • EventLog::enable(): programmatic opt-in for default runtime logging
  • InferenceRuntime::fromProvider(...): uses the built-in runtime event wiring
  • JSONL readback: inspect emitted inference and HTTP lifecycle events after the call

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Example

<?php
require 'examples/boot.php';
require_once 'examples/_support/eventlog_readback.php';

use Cognesy\Logging\EventLog;
use Cognesy\Messages\Messages;
use Cognesy\Polyglot\Inference\Inference;
use Cognesy\Polyglot\Inference\InferenceRuntime;
use Cognesy\Polyglot\Inference\LLMProvider;

$logPath = ExampleEventLog::path('examples-b03-inference-eventlog');

EventLog::enable($logPath);

try {
    $runtime = InferenceRuntime::fromProvider(LLMProvider::using('openai'));

    $response = Inference::fromRuntime($runtime)
        ->with(
            messages: Messages::fromString('Answer in one sentence: what is the capital of France?'),
            options: ['max_tokens' => 48],
        )
        ->get();

    $entries = ExampleEventLog::read($logPath);
} finally {
    EventLog::disable();
}

echo "=== Inference Result ===\n";
echo "Response: {$response}\n";

echo "\n=== EventLog Entries ===\n";
echo "Log file: {$logPath}\n";
echo 'Entries captured: ' . count($entries) . "\n\n";

ExampleEventLog::print($entries, 8);

assert($response !== '');
assert($entries !== []);
?>