SDK

<?php
$exporter = new InMemoryExporter();
$meterProvider = new NoopMeterProvider();
$tracerProvider =  new TracerProvider(
    new BatchSpanProcessor(
        $exporter,
        ClockFactory::getDefault(),
        2048, //max queue size
        5000, //export timeout
        1024, //max batch size
        true, //autoflush
        $meterProvider
    )
);

<?php

$spanExporter = new InMemoryExporter(); //mock exporter for demonstration purposes

$tracerProvider = TracerProvider::builder()
    ->addSpanProcessor(
        (new BatchSpanProcessorBuilder($spanExporter))
            ->setMeterProvider($meterProvider)
            ->build()
    )
    ->build();

Sdk::builder()
    ->setTracerProvider($tracerProvider)
    ->setMeterProvider($meterProvider)
    ->setPropagator(TraceContextPropagator::getInstance())
    ->setAutoShutdown(true)
    ->buildAndRegisterGlobal();

OTEL_PHP_AUTOLOAD_ENABLED=true \
OTEL_EXPORTER_OTLP_PROTOCOL=grpc \
OTEL_EXPORTER_OTLP_ENDPOINT=http://collector:4317 \
php example.php

<?php
require 'vendor/autoload.php'; //sdk autoloading happens as part of composer initialization

$tracer = OpenTelemetry\API\Common\Instrumentation\Globals::tracerProvider()->getTracer('name', 'version', 'schema.url', [/*attributes*/]);
$meter = OpenTelemetry\API\Common\Instrumentation\Globals::meterProvider()->getTracer('name', 'version', 'schema.url', [/*attributes*/]);