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OpenTelemetry Context

Immutable execution scoped propagation mechanism, for further details see opentelemetry-specification.

Installation

composer require open-telemetry/context

Usage

Implicit propagation

$context = Context::getCurrent();
// modify context
$scope = $context->activate();
try {
 // run within new context
} finally {
 $scope->detach();
}

It is recommended to use a try-finally statement after ::activate() to ensure that the created scope is properly ::detach()ed.

Debug scopes

By default, scopes created by ::activate() warn on invalid and missing calls to ::detach() in non-production environments. This feature can be disabled by setting the environment variable OTEL_PHP_DEBUG_SCOPES_DISABLED to a truthy value. Disabling is only recommended for applications using exit / die to prevent unavoidable notices.

Async applications

Fiber support - automatic context propagation to newly created fibers

Requires an NTS build, ext-ffi, and setting the environment variable OTEL_PHP_FIBERS_ENABLED to a truthy value. Additionally vendor/autoload.php has to be preloaded for non-CLI SAPIs if ffi.enable is set to preload.

Event loops

Event loops have to restore the original context on callback execution. A basic implementation could look like the following, though implementations should avoid keeping unnecessary references to arguments if possible:

function bindContext(Closure $closure): Closure {
 $context = Context::getCurrent();
 return static function (mixed ...$args) use ($closure, $context): mixed {
 $scope = $context->activate();
 try {
 return $closure(...$args);
 } finally {
 $scope->detach();
 }
 };
}

Contributing

This repository is a read-only git subtree split. To contribute, please see the main OpenTelemetry PHP monorepo.