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+[![Releases](https://img.shields.io/badge/releases-purple)](https://github.com/opentelemetry-php/sdk/releases)
+[![Source](https://img.shields.io/badge/source-sdk-green)](https://github.com/open-telemetry/opentelemetry-php/tree/main/src/SDK)
+[![Mirror](https://img.shields.io/badge/mirror-opentelemetry--php:sdk-blue)](https://github.com/opentelemetry-php/sdk)
+[![Latest Version](http://poser.pugx.org/open-telemetry/sdk/v/unstable)](https://packagist.org/packages/open-telemetry/sdk/)
+[![Stable](http://poser.pugx.org/open-telemetry/sdk/v/stable)](https://packagist.org/packages/open-telemetry/sdk/)
+
+# OpenTelemetry SDK
+
+The OpenTelemetry PHP SDK implements the API, and should be used in conjunction with contributed exporter(s) to generate and export telemetry.
+
+## Documentation
+
+https://opentelemetry.io/docs/instrumentation/php/sdk/
+
+## Getting started
+
+### Manual setup
+
+See https://github.com/open-telemetry/opentelemetry-php/tree/main/examples
+
+### SDK Builder
+
+See https://github.com/open-telemetry/opentelemetry-php/blob/main/examples/sdk_builder.php
+
+### Autoloading
+
+SDK autoloading works with configuration values provided via the environment (or php.ini).
+
+The SDK can be automatically created and registered, if the following conditions are met:
+- `OTEL_PHP_AUTOLOAD_ENABLED=true`
+- all required [SDK configuration](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/sdk-environment-variables.md#general-sdk-configuration) is provided
+
+SDK autoloading will be attempted as part of composer's autoloader:
+
+```php
+require 'vendor/autoload.php';
+
+$tracer = \OpenTelemetry\API\Globals::tracerProvider()->getTracer('example');
+$meter = \OpenTelemetry\API\Globals::meterProvider()->getMeter('example');
+```
+
+If autoloading was not successful (or partially successful), no-op implementations of the above may be returned.
+
+See https://github.com/open-telemetry/opentelemetry-php/blob/main/examples/autoload_sdk.php for a more detailed example.
+
+## Contributing
+
+This repository is a read-only git subtree split.
+To contribute, please see the main [OpenTelemetry PHP monorepo](https://github.com/open-telemetry/opentelemetry-php).