README

Development-time profiler for request lifecycle, boot timing, service instrumentation, and timeline rendering.

Use this package as an optional development dependency. It is designed to be easy to disable in production: application code can depend on ProfilerInterface, while config decides whether the real profiler or a no-op integration is wired.

Installation

composer require componenta/profiler

This package intentionally does not declare extra.componenta.config-providers. Register Componenta\Profiler\ConfigProvider manually from development-only application config when profiling is enabled.

Requirements

• PHP 8.4+

Related Packages

Core API

use Componenta\Profiler\Profiler;

$profiler = new Profiler();

$profiler->mark('boot');

$span = $profiler->span('controller');
// run work
$span->close();

$marks = $profiler->marks();

Marks are ordered records with labels, timestamps, memory usage, and type:

• Point: instant marker
• Begin: span start
• End: span end

Early Bootstrap Marks

Marks is a process-global facade for points that happen before the DI container exists:

use Componenta\Profiler\Marks;

Marks::mark('autoload.loaded');

The application integration can merge these early marks into the configured ProfilerInterface.

Rendering

Renderers convert collected marks into formats useful for debugging:

• JsonRenderer: structured machine-readable output.
• ServerTimingRenderer: Server-Timing header value.
• WaterfallRenderer: human-readable timeline.
• CompositeRenderer: chooses among renderers.

HTTP And Framework Integration

The integration layer includes:

• TimingMiddleware: marks PSR-15 request handling.
• ProfilerMiddleware: exposes profiler output when a trigger matches.
• TimingBootloader: records bootloader spans.
• service delegators for profiling selected classes.
• ProfilingPipelineFactory for wrapping middleware pipelines.

Triggers

Triggers decide whether profiling output should be enabled for a request:

• query parameter trigger
• header trigger
• cookie trigger
• composite trigger

This keeps profiling opt-in and avoids exposing profiler data by default.

DI Registration

ConfigProvider registers profiler services, renderers, triggers, and optional integration points. Keep the package dev-only unless the application has an explicit production observability use case.