configuration_from_environment.php

<?php

declare(strict_types=1);

namespace OpenTelemetry\Example;

require __DIR__ . '/../../../vendor/autoload.php';

use OpenTelemetry\SDK\Trace\TracerProviderFactory;

//@see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/configuration/sdk-environment-variables.md
putenv('OTEL_RESOURCE_ATTRIBUTES=service.version=1.0.0');
putenv('OTEL_SERVICE_NAME=example-app');
putenv('OTEL_LOG_LEVEL=warning');
putenv('OTEL_TRACES_SAMPLER=traceidratio');
putenv('OTEL_TRACES_SAMPLER_ARG=0.95');
putenv('OTEL_TRACES_EXPORTER=otlp');
putenv('OTEL_EXPORTER_OTLP_ENDPOINT=http://collector:4318');
putenv('OTEL_EXPORTER_OTLP_PROTOCOL=http/json');
putenv('OTEL_PHP_TRACES_PROCESSOR=batch');
putenv('OTEL_BSP_SCHEDULE_DELAY=10000');

echo 'Creating Exporter From Environment' . PHP_EOL;

$tracerProvider = (new TracerProviderFactory())->create();

$tracer = $tracerProvider->getTracer('io.opentelemetry.contrib.php');

echo 'Starting Tracer' . PHP_EOL;

$rootSpan = $tracer->spanBuilder('root')->startSpan();
$scope = $rootSpan->activate();

try {
    $rootSpan->addEvent('my_event')->setAttribute('fruit', 'apple');
} finally {
    $rootSpan->end();
    $scope->detach();
}

$tracerProvider->shutdown();