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Latest commit 14abf9f Sep 27, 2018

Stackdriver Trace for PHP

Idiomatic PHP client for Stackdriver Trace.

Latest Stable Version Packagist

NOTE: This repository is part of [Google Cloud PHP][github-home]. Any support requests, bug reports, or development contributions should be directed to that project.

A distributed tracing system for Google Cloud Platform that collects latency data from App Engine applications and displays it in near real time in the Google Cloud Platform Console.


To begin, install the preferred dependency manager for PHP, Composer.

Now to install just this component:

$ composer require google/cloud-trace

Or to install the entire suite of components at once:

$ composer require google/cloud

This component supports both REST over HTTP/1.1 and gRPC. In order to take advantage of the benefits offered by gRPC (such as streaming methods) please see our gRPC installation guide.


Please see our Authentication guide for more information on authenticating your client. Once authenticated, you'll be ready to start making requests.


require 'vendor/autoload.php';

use Google\Cloud\Trace\TraceClient;

$traceClient = new TraceClient();

// Create a Trace
$trace = $traceClient->trace();
$span = $trace->span([
    'name' => 'main'


// List recent Traces
foreach($traceClient->traces() as $trace) {

Creating a Trace

use Google\Cloud\Trace\TraceClient;

$client = new TraceClient();
$trace = $client->trace();
$span = $trace->span(['name' => 'main']);


Using OpenCensus

We highly recommend using the OpenCensus project to instrument your application. OpenCensus is an open source, distributed tracing framework that maintains integrations with popular frameworks and tools. OpenCensus provides a data exporter for Stackdriver Trace which uses this library. If you were using google/cloud-trace <= v0.3.3 or google/cloud <= 0.46.0, then check out the migration guide to OpenCensus.

Install with composer or add to your composer.json.

$ composer require opencensus/opencensus

Use the provided StackdriverExporter when configuring your tracer.

use OpenCensus\Trace\Exporter\StackdriverExporter;
use OpenCensus\Trace\Tracer;

Tracer::start(new StackdriverExporter());

See the OpenCensus documentation for more configuration options and features.


This component is considered alpha. As such, it is still a work-in-progress and is more likely to get backwards-incompatible updates.

Next Steps

  1. Understand the official documentation.
  2. Take a look at in-depth usage samples.