StaticInjectionPropagator.php
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StaticInjectionPropagator.php
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	<?php
	namespace Wikimedia\Telemetry;

	/**
	* A {@link ContextPropagatorInterface} implementation that injects
	* a fixed set of headers into outgoing requests. It does not perform extraction.
	*
	* @since 1.44
	* @internal
	*/
	class StaticInjectionPropagator implements ContextPropagatorInterface {
	private array $headers;

	public function __construct( array $headers ) {
	$this->headers = $headers;
	}

	/**
	* @inheritDoc
	*/
	public function inject( ?SpanContext $spanContext, array $carrier ): array {
	foreach ( $this->headers as $key => $value ) {
	$carrier[$key] = $value;
	}
	return $carrier;
	}

	/**
	* @inheritDoc
	*/
	public function extract( array $carrier ): ?SpanContext {
	return null;
	}
	}