feat: add Excimer auto-sampling profiler with flamegraph dashboard by Copilot · Pull Request #4 · PHPDevsr/php-profiler

Copilot · 2026-04-18T17:14:47Z

Summary

Adds end-to-end automatic PHP request profiling using the Excimer extension, a standalone auto-prepend entry point, and a self-contained flamegraph dashboard.

Setup (two steps)

1. php.ini

auto_prepend_file = /opt/php-profiler/profiler.php

2. Web server – secure the dashboard (Nginx example)

location /profiler/ {
    alias /opt/php-profiler/dashboard/;
    allow 127.0.0.1;
    deny  all;
    index index.php;
    location ~ \.php$ {
        fastcgi_pass unix:/run/php/php8.3-fpm.sock;
        include fastcgi_params;
        fastcgi_param SCRIPT_FILENAME $request_filename;
    }
}

Then open http://127.0.0.1/profiler/ after making some requests.

Changes

New files

File	Purpose
`profiler.php`	Standalone `auto_prepend_file` – starts an `ExcimerProfiler` on every HTTP request and saves a JSON profile to `data/` on shutdown. No autoloader needed. Sanitizes `REQUEST_URI`, excludes the dashboard path, and prunes the oldest files when > 10 000 profiles accumulate.
`dashboard/index.php`	Single-file PHP web dashboard. Serves JSON API endpoints (`?action=endpoints`, `?action=profiles`, `?action=export`) and a full HTML page with a pure-JS SVG flamegraph renderer (no CDN dependencies).
`src/Storage/FileStorage.php`	Library class for saving/reading profile JSON files, computing per-endpoint statistics, and rolling cleanup.
`stubs/ExcimerProfiler.php`	PHPStan stub for the `ExcimerProfiler` C-extension class.
`stubs/ExcimerLog.php`	PHPStan stub for `ExcimerLog`.
`stubs/ExcimerLogEntry.php`	PHPStan stub for `ExcimerLogEntry`.
`tests/Storage/FileStorageTest.php`	Unit tests for `FileStorage` (save, findAll, findByEndpoint, getEndpointStats, cleanup).

Modified files

File	Change
`src/Profiler.php`	Integrates real Excimer calls when the extension is loaded; adds `getFoldedStacks()` method; adds `parseFoldedStacks()` private helper with positive-integer count validation.
`tests/ProfilerTest.php`	Tests for `getFoldedStacks()`, updated `reset()` behaviour, and start/stop lifecycle.
`phpstan.neon.dist`	Adds `stubFiles` entries for the three Excimer stubs (required for level-9 analysis).
`README.md`	Full documentation: quick-start, Nginx/Apache config, library API, development commands.

Dashboard features

Endpoint ranking – sidebar lists all profiled URIs sorted by total sample count, with request count / avg duration / sample bar
Filter – live search input to filter the endpoint list
Merged flamegraph – clicking an endpoint merges all its profiles and renders a zoomable SVG flamegraph (pure JS, no CDN)
Zoom + breadcrumb – click a frame to zoom in; breadcrumb trail for navigation
Frame highlight – toolbar search box highlights matching frames in amber
Export JSON – downloads the merged folded-stacks profile as a .json file
Auto-refresh – ↻ button reloads the endpoint list

Agent-Logs-Url: https://github.com/PHPDevsr/php-profiler/sessions/071177e1-7af4-4040-92bc-ad0a180b3efb Co-authored-by: ddevsr <97607754+ddevsr@users.noreply.github.com>

…t filename, count validation) Agent-Logs-Url: https://github.com/PHPDevsr/php-profiler/sessions/071177e1-7af4-4040-92bc-ad0a180b3efb Co-authored-by: ddevsr <97607754+ddevsr@users.noreply.github.com>

ddevsr · 2026-04-18T17:47:40Z

@copilot fix all functional PHP Unit

Agent-Logs-Url: https://github.com/PHPDevsr/php-profiler/sessions/19e82ae3-7ad7-4e95-aa5b-b5581b73f268 Co-authored-by: ddevsr <97607754+ddevsr@users.noreply.github.com>

Copilot · 2026-04-18T17:54:38Z

@copilot fix all functional PHP Unit

Fixed in commit 7bd6dba. Two root causes were addressed:

Class "PHPDevsr\Profiler\ExcimerProfiler" not found — Inside the PHPDevsr\Profiler namespace, new ExcimerProfiler() resolved to PHPDevsr\Profiler\ExcimerProfiler instead of the global extension class. Added use ExcimerProfiler; to src/Profiler.php.
Call to undefined function Tests\assertSame() (and similar) — Standalone assertion functions called without a namespace prefix are looked up in the current namespace first (e.g. Tests\assertSame()). Added the required use function PHPUnit\Framework\assert*; imports to both tests/ProfilerTest.php and tests/Storage/FileStorageTest.php.

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ddevsr · 2026-04-18T18:02:50Z

@copilot fix PHPStan

…eTest Agent-Logs-Url: https://github.com/PHPDevsr/php-profiler/sessions/ba342eb1-f3bd-47c9-9374-2b07ab63be83 Co-authored-by: ddevsr <97607754+ddevsr@users.noreply.github.com>

Copilot · 2026-04-18T18:09:15Z

@copilot fix PHPStan

Fixed in commit 6d4aa6b. All 15 PHPStan level-9 errors addressed:

src/Storage/FileStorage.php (12 errors):

Added /** @var string $id */ to narrow $profile['id'] from mixed before string concatenation
Changed the $endpoints @var annotation to a typed array shape (array{endpoint: string, request_count: int, total_samples: int, total_duration_ms: float, avg_duration_ms: float}) so all inner field accesses are concrete types instead of mixed
Replaced (string) ($profile['endpoint'] ?? '') with is_string() narrowing
Replaced (int)/(float) casts on $profile['sample_count']/$profile['duration_ms'] with is_int()/is_float() narrowing
Removed now-redundant casts on typed-shape fields in the foreach and usort callback
Removed the array_values() wrapping (usort already produces a list)

tests/Storage/FileStorageTest.php (3 errors):

Replaced 3× short ternary ?: [] (banned by phpstan-strict-rules) with !== false ? $x : [] long ternary

ddevsr · 2026-04-19T13:47:41Z

@copilot fix PHPUnit why

Agent-Logs-Url: https://github.com/PHPDevsr/php-profiler/sessions/5ade9e2b-bbee-4df1-946c-0faf79b66be2 Co-authored-by: ddevsr <97607754+ddevsr@users.noreply.github.com>

Copilot · 2026-04-19T13:59:46Z

@copilot fix PHPUnit why

Fixed in commit 0421bbd.

The PHP 8.3 CI runner installs excimer from the ondrej/php apt package, which is an older build that defines ExcimerProfiler and ExcimerLog but is missing the ExcimerLog::formatFolded() method. PHP 8.4 and 8.5 runners either get a newer PECL build or can't install excimer at all — so only the 8.3 job hit this.

Changes:

src/Profiler.php – wrapped $excimerLog->formatFolded() in a try/catch (\Error) so stop() degrades gracefully (falls back to empty folded stacks) instead of crashing with an unhandled \Error. This also fixes the 3 "FAILURE" tests where a RuntimeException in a try block was being swallowed by the \Error thrown in the finally { $this->profiler->stop(); }.
stubs/ExcimerLog.php – added @throws \Error to formatFolded() so PHPStan (level 9) knows the catch clause is not dead code.

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https://api.github.com/repos/sebastianbergmann/complexity/zipball/bad4316aba5303d0221f43f8cee37eb58d384bbb
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- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/gK1yfQ /usr/bin/composer install --no-progress --no-interaction --prefer-dist --optimize-autoloader --ignore-platform-req=ext-excimer sh -c en (http block)
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- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/gK1yfQ /usr/bin/composer install --no-progress --no-interaction --prefer-dist --optimize-autoloader --ignore-platform-req=ext-excimer sh -c en (http block)
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- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/gK1yfQ /usr/bin/composer install --no-progress --no-interaction --prefer-dist --optimize-autoloader --ignore-platform-req=ext-excimer sh -c en (http block)
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- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/gK1yfQ /usr/bin/composer install --no-progress --no-interaction --prefer-dist --optimize-autoloader --ignore-platform-req=ext-excimer sh -c en (http block)
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- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/gK1yfQ /usr/bin/composer install --no-progress --no-interaction --prefer-dist --optimize-autoloader --ignore-platform-req=ext-excimer sh -c en (http block)
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- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/gK1yfQ /usr/bin/composer install --no-progress --no-interaction --prefer-dist --optimize-autoloader --ignore-platform-req=ext-excimer sh -c en (http block)
https://api.github.com/repos/sebastianbergmann/object-enumerator/zipball/1effe8e9b8e068e9ae228e542d5d11b5d16db894
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- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/gK1yfQ /usr/bin/composer install --no-progress --no-interaction --prefer-dist --optimize-autoloader --ignore-platform-req=ext-excimer sh -c en (http block)
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- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/gK1yfQ /usr/bin/composer install --no-progress --no-interaction --prefer-dist --optimize-autoloader --ignore-platform-req=ext-excimer sh -c en (http block)
https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/876099a072646c7745f673d7aeab5382c4439691
- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/rY4MIw /usr/bin/composer install --no-progress --no-interaction --prefer-dist --ignore-platform-req=ext-excimer (http block)
- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/gK1yfQ /usr/bin/composer install --no-progress --no-interaction --prefer-dist --optimize-autoloader --ignore-platform-req=ext-excimer sh -c en (http block)
https://api.github.com/repos/sebastianbergmann/php-file-iterator/zipball/3d1cd096ef6bea4bf2762ba586e35dbd317cbfd5
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- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/gK1yfQ /usr/bin/composer install --no-progress --no-interaction --prefer-dist --optimize-autoloader --ignore-platform-req=ext-excimer sh -c en (http block)
https://api.github.com/repos/sebastianbergmann/php-invoker/zipball/12b54e689b07a25a9b41e57736dfab6ec9ae5406
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- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/gK1yfQ /usr/bin/composer install --no-progress --no-interaction --prefer-dist --optimize-autoloader --ignore-platform-req=ext-excimer sh -c en (http block)
https://api.github.com/repos/sebastianbergmann/php-text-template/zipball/e1367a453f0eda562eedb4f659e13aa900d66c53
- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/rY4MIw /usr/bin/composer install --no-progress --no-interaction --prefer-dist --ignore-platform-req=ext-excimer (http block)
- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/gK1yfQ /usr/bin/composer install --no-progress --no-interaction --prefer-dist --optimize-autoloader --ignore-platform-req=ext-excimer sh -c en (http block)
https://api.github.com/repos/sebastianbergmann/php-timer/zipball/f258ce36aa457f3aa3339f9ed4c81fc66dc8c2cc
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- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/gK1yfQ /usr/bin/composer install --no-progress --no-interaction --prefer-dist --optimize-autoloader --ignore-platform-req=ext-excimer sh -c en (http block)
https://api.github.com/repos/sebastianbergmann/phpcov/zipball/33d0c31e5fbed58ecef62283fe14974eea80bb5a
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- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/gK1yfQ /usr/bin/composer install --no-progress --no-interaction --prefer-dist --optimize-autoloader --ignore-platform-req=ext-excimer sh -c en (http block)
https://api.github.com/repos/sebastianbergmann/phpunit/zipball/c54fcf3d6bcb6e96ac2f7e40097dc37b5f139969
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- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/gK1yfQ /usr/bin/composer install --no-progress --no-interaction --prefer-dist --optimize-autoloader --ignore-platform-req=ext-excimer sh -c en (http block)
https://api.github.com/repos/sebastianbergmann/recursion-context/zipball/0b01998a7d5b1f122911a66bebcb8d46f0c82d8c
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- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/gK1yfQ /usr/bin/composer install --no-progress --no-interaction --prefer-dist --optimize-autoloader --ignore-platform-req=ext-excimer sh -c en (http block)
https://api.github.com/repos/sebastianbergmann/type/zipball/e549163b9760b8f71f191651d22acf32d56d6d4d
- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/rY4MIw /usr/bin/composer install --no-progress --no-interaction --prefer-dist --ignore-platform-req=ext-excimer (http block)
- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/gK1yfQ /usr/bin/composer install --no-progress --no-interaction --prefer-dist --optimize-autoloader --ignore-platform-req=ext-excimer sh -c en (http block)
https://api.github.com/repos/sebastianbergmann/version/zipball/3e6ccf7657d4f0a59200564b08cead899313b53c
- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/rY4MIw /usr/bin/composer install --no-progress --no-interaction --prefer-dist --ignore-platform-req=ext-excimer (http block)
- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/gK1yfQ /usr/bin/composer install --no-progress --no-interaction --prefer-dist --optimize-autoloader --ignore-platform-req=ext-excimer sh -c en (http block)
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- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/rY4MIw /usr/bin/composer install --no-progress --no-interaction --prefer-dist --ignore-platform-req=ext-excimer (http block)
- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/gK1yfQ /usr/bin/composer install --no-progress --no-interaction --prefer-dist --optimize-autoloader --ignore-platform-req=ext-excimer sh -c en (http block)
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- Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/gK1yfQ /usr/bin/composer install --no-progress --no-interaction --prefer-dist --optimize-autoloader --ignore-platform-req=ext-excimer sh -c en (http block)

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Copilot AI and others added 2 commits April 18, 2026 17:12

feat: add Excimer auto-sampling profiler with flamegraph dashboard

222c1dd

Agent-Logs-Url: https://github.com/PHPDevsr/php-profiler/sessions/071177e1-7af4-4040-92bc-ad0a180b3efb Co-authored-by: ddevsr <97607754+ddevsr@users.noreply.github.com>

fix: address code review feedback (sanitize URI, cache headers, expor…

ae03192

…t filename, count validation) Agent-Logs-Url: https://github.com/PHPDevsr/php-profiler/sessions/071177e1-7af4-4040-92bc-ad0a180b3efb Co-authored-by: ddevsr <97607754+ddevsr@users.noreply.github.com>

Copilot AI assigned Copilot and ddevsr Apr 18, 2026

Copilot created this pull request from a session on behalf of ddevsr April 18, 2026 17:15 View session

Copilot finished work on behalf of ddevsr April 18, 2026 17:15

Copilot AI requested a review from ddevsr April 18, 2026 17:15

ddevsr added 5 commits April 19, 2026 00:18

chore: require ext-excimer

37338ca

chore: require ext-excimer

5352080

chore: require ext-excimer

8a17fa0

refactor: run Rector

5270c2e

refactor: run Rector

3ee2bd0

ddevsr marked this pull request as ready for review April 18, 2026 17:34

refactor: PHPUnit use function stub instead

3a84d24

Copilot started work on behalf of ddevsr April 18, 2026 17:47 View session

fix: resolve namespace issues causing PHPUnit test failures

7bd6dba

Agent-Logs-Url: https://github.com/PHPDevsr/php-profiler/sessions/19e82ae3-7ad7-4e95-aa5b-b5581b73f268 Co-authored-by: ddevsr <97607754+ddevsr@users.noreply.github.com>

Copilot finished work on behalf of ddevsr April 18, 2026 17:55

refactor: ordering

0492868

Copilot started work on behalf of ddevsr April 18, 2026 18:02 View session

fix: address all PHPStan level-9 errors in FileStorage and FileStorag…

6d4aa6b

…eTest Agent-Logs-Url: https://github.com/PHPDevsr/php-profiler/sessions/ba342eb1-f3bd-47c9-9374-2b07ab63be83 Co-authored-by: ddevsr <97607754+ddevsr@users.noreply.github.com>

Copilot finished work on behalf of ddevsr April 18, 2026 18:09

Copilot started work on behalf of ddevsr April 19, 2026 13:47 View session

fix: make stop() resilient to old Excimer builds missing formatFolded()

0421bbd

Agent-Logs-Url: https://github.com/PHPDevsr/php-profiler/sessions/5ade9e2b-bbee-4df1-946c-0faf79b66be2 Co-authored-by: ddevsr <97607754+ddevsr@users.noreply.github.com>

Copilot finished work on behalf of ddevsr April 19, 2026 14:00

ddevsr added 2 commits April 19, 2026 21:53

refactor: run rector and default config PHPUnit

b26c7af

refactor: run rector

9e6081e

ddevsr approved these changes Apr 19, 2026

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ddevsr merged commit ae932db into main Apr 19, 2026
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ddevsr deleted the copilot/add-excimer-profiling-dashboard branch April 19, 2026 14:58

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feat: add Excimer auto-sampling profiler with flamegraph dashboard#4

feat: add Excimer auto-sampling profiler with flamegraph dashboard#4
ddevsr merged 14 commits into
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copilot/add-excimer-profiling-dashboard

Copilot AI commented Apr 18, 2026

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ddevsr commented Apr 18, 2026

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Copilot AI commented Apr 18, 2026 •

edited

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ddevsr commented Apr 18, 2026

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Copilot AI commented Apr 18, 2026

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ddevsr commented Apr 19, 2026

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Copilot AI commented Apr 19, 2026 •

edited

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Copilot AI commented Apr 18, 2026

Summary

Setup (two steps)

Changes

New files

Modified files

Dashboard features

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ddevsr commented Apr 18, 2026

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I tried to connect to the following addresses, but was blocked by firewall rules:

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Copilot AI commented Apr 18, 2026 •

edited

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Copilot AI commented Apr 19, 2026 •

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