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Definition
/**
* Create an async curl transport for OTLP endpoints.
*
* Creates a CurlTransport that uses curl_multi for non-blocking I/O.
* Unlike HttpTransport (PSR-18), this transport queues requests and executes
* them asynchronously. Completed requests are processed on subsequent send()
* calls or on shutdown().
*
* Requires: ext-curl PHP extension
*
* Example usage:
* ```php
* // JSON over HTTP (async) with default options
* $transport = otlp_curl_transport(
* endpoint: 'http://localhost:4318',
* serializer: otlp_json_serializer(),
* );
*
* // Protobuf over HTTP (async) with custom options
* $transport = otlp_curl_transport(
* endpoint: 'http://localhost:4318',
* serializer: otlp_protobuf_serializer(),
* options: otlp_curl_options()
* ->withTimeout(60)
* ->withHeader('Authorization', 'Bearer token')
* ->withCompression(),
* );
* ```
*
* @param string $endpoint OTLP endpoint URL (e.g., 'http://localhost:4318')
* @param Serializer $serializer Serializer for encoding telemetry data (JSON or Protobuf)
* @param CurlTransportOptions $options Transport configuration options
*/
otlp_curl_transport(string $endpoint, Serializer $serializer, CurlTransportOptions $options) : CurlTransport
