You can write logs to Cloud Logging from PHP applications by using the Cloud Logging library for PHP directly.
Before you begin
- Sign in to your Google Cloud account. If you're new to Google Cloud, create an account to evaluate how our products perform in real-world scenarios. New customers also get $300 in free credits to run, test, and deploy workloads.
In the Google Cloud Console, on the project selector page, select or create a Google Cloud project.
Make sure that billing is enabled for your Cloud project. Learn how to confirm that billing is enabled for your project.
- Enable the Cloud Logging API.
Installing the Cloud Logging library for PHP
The Cloud Logging library for PHP provides a simple PSR-3 logger implementation for PHP web frameworks.
To write logs from your app, add the Cloud Logging library for PHP to your composer.json:
composer require google/cloud-logging
Creating a PSR-3 logger
Use the following code to create a PSR-3 logger:
$logging = new LoggingClient([ 'projectId' => $projectId ]); $logger = $logging->psrLogger('app');
Enabling batching option
The PSR-3 logger sends the logs synchronously. This means that whenever you emit a log, it will add RPC latency to the user request. Especially if you emit multiple logs in a single request, the added latency will be significant. You probably want to avoid that.
The following code creates a PSR-3 logger which will batch multiple logs into one single RPC calls:
$logger = LoggingClient::psrBatchLogger('app');
By default, this logger batches the logs within a single process. On App Engine flexible environment, you can configure the Cloud Logging library for PHP for even higher throughput and lower latency. For details, see Configuring the logging daemon.
Configuring the Cloud Logging library for PHP
You can customize the behavior of the Cloud Logging library for PHP. See the configuration document for a list of possible configuration options.
Using the PSR-3 logger
Once the logger is created, you can use the logger in your application:
$logger->info('Hello World'); $logger->error('Oh no');
Using the Cloud Client Library directly
For information on using the Cloud Logging Cloud client library for PHP directly, see Cloud Logging Client Libraries.
Running on Google Cloud
The Cloud Logging library for PHP can be used without needing to explicitly provide credentials.
Cloud Logging is automatically enabled for App Engine applications. No additional setup is required.
However, we recommend that you use the PSR-3 logger which automatically adds metadata to your logs so that your application logs are correlated to the request logs.
Configuring the daemon for App Engine flexible environment
In the App Engine flexible environment, you can configure the
Cloud Logging library for PHP to use an external daemon program to maximize the
log throughput and minimize the app's latency. To enable this feature,
add the following line to
runtime_config section in
Google Kubernetes Engine (GKE)
If needed, you can also use the following command to add the
access scope when creating the cluster:
gcloud container clusters create example-cluster-name \ --scopes https://www.googleapis.com/auth/logging.write
When using Compute Engine VM instances, add the
access scope to each instance. When creating a new instance through the
Google Cloud Console, you can do this in the Identity and API access section
of the Create Instance panel. Use the Compute Engine default service
account or another service account of your choice, and select
Allow full access to all Cloud APIs in the Identity and API access
section. Whichever service
account you select, ensure that it has been granted the
Logs Writer role in the IAM & Admin section of the
Running locally and elsewhere
To use the Cloud Logging library for PHP outside of Google Cloud, including running the library on your own workstation, on your data center's computers, or on the VM instances of another cloud provider, you must supply your Google Cloud project ID and appropriate service account credentials directly to the Cloud Logging library for PHP.
You can create and obtain service account credentials manually. When specifying the Role field, use the Logs Writer role. For more information on Identity and Access Management roles, go to Access control guide.
Viewing the logs
After deployment, you can view the logs in the Logs Explorer.
In the Logs Explorer, you must specify one or more resources, but the resource selection might not be obvious. Here are some tips to help you get started:
If you are deploying your application to App Engine or using the App Engine-specific libraries, set your resource to GAE Application.
If you are deploying your application on Compute Engine, set the resource to GCE VM Instance.
If you are deploying your application on Google Kubernetes Engine, your cluster's logging configuration determines the resource type of the log entries. For a detailed discussion on the Legacy Google Cloud's operations suite and the Google Cloud's operations suite Kubernetes Monitoring solutions, and how those options affect the resource type, see Migrating to Google Cloud's operations suite Kubernetes Monitoring.
If your application is using the Cloud Logging API directly, the resource is dependent on the API and your configuration. For example, in your application, you can specify a resource or use a default resource.
If you don't see any logs in the Logs Explorer, to see all log entries, switch to the advanced query mode and use an empty query.
- To switch to the advanced query mode, click menu (▾) at the top of the Logs Explorer and then select Convert to advanced filter.
- Clear the content that appears in the filter box.
- Click Submit Filter.
You can examine the individual entries to identify your resources.