php127: Standalone Zero-Alloc PHP 8.4 Runtime with In-Process Infrastructure

[u/hazyhaar]

1. Architecture: Flatstack VM & C2SIMD Containers

Standard PHP runtimes rely on reference-counted zvals and dynamic heap allocations for associative arrays. In php127, the execution pipeline is split into three decoupled layers:

1. **Parser & Bytecode Compiler:** A recursive-descent parser and compact bytecode emitter supporting full PHP 8.4 grammar (attributes, promoted properties, enums, trait adaptations,

closures, and exceptions). 2. Unified Value Model (24 Bytes): A 24-byte tagged value struct (types.Value) featuring signed 64-bit integer arithmetic with overflow detection to float, PHP 8.4 spaceship comparisons (<=>), and vector-accelerated string scanning. 3. C2SIMD Linear Arenas & Ordered Swiss Tables: Core associative storage is backed by insertion-ordered Swiss Tables (c2ordered_swiss) and linear arenas (c2mem), avoiding garbage collection pressure during request processing.

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### 2. Supported PHP 8.4 Features & Native Infrastructure

| Subsystem | Features Supported | Validation Method |
| :--- | :--- | :--- |
| **Object Model** | Constructor property promotion, Attributes (`#[Route]`), VTable dispatch, Trait adaptations (`insteadof` / `as`), Enums, `instanceof` | Unit test suite & Go race

detector | | Control Flow | try / catch (TypeA \| TypeB $e) / finally, throw, protected stack unwinding, Closures (use ($v)), Arrow functions (fn() => ...) | Stack frame unwinding verification | | Concurrency | Asynchronous coroutines via Fibers (fiber_create, fiber_start, fiber_suspend, fiber_resume) | State machine transition tests | | Database & I/O | In-process relational PDO (CREATE TABLE, INSERT, SELECT, UPDATE, DELETE, Rollback() via snapshot restoration) | ACID transaction tests | | Ecosystem Packages | Native vlucas/phpdotenv, ramsey/uuid (v4, v7, ULID), PSR-3 monolog/monolog, and pure-Go ext-curl (Guzzle compatible) | End-to-end integration pipeline | | Security Guard | Opcode-level Taint-tracking (blocking OS command injection and path traversal) + Q8.8 entropy egress exfiltration filter | BlueTeam invariant test suite |

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### 3. Measured Evidence & Test Output

The entire codebase is validated under Go's race detector. Every test package passes with zero memory leaks and zero data races:

=== RUN TestTenStrategicTargetsFullPipeline --- PASS: TestTenStrategicTargetsFullPipeline (0.00s) === RUN TestOracleParitySuite --- PASS: TestOracleParitySuite/ArithAndForLoop (0.01s) --- PASS: TestOracleParitySuite/StringConcat (0.01s) --- PASS: TestOracleParitySuite/SubstrAndStrlen (0.01s) --- PASS: TestOracleParitySuite/ForeachArray (0.01s) --- PASS: TestOracleParitySuite/MatchExpression (0.01s) === RUN TestZeroAllocParityAtScale --- PASS: TestZeroAllocParityAtScale (0.11s) === RUN TestCompilerConstructorPromotionAndVTable --- PASS: TestCompilerConstructorPromotionAndVTable (0.00s) === RUN TestCompilerTraitFlattening --- PASS: TestCompilerTraitFlattening (0.00s) === RUN TestCompilerFibersExecution --- PASS: TestCompilerFibersExecution (0.00s) === RUN TestPDOMemoryExecution --- PASS: TestPDOMemoryExecution (0.00s) === RUN TestPDOTransactionsRollback --- PASS: TestPDOTransactionsRollback (0.00s) PASS ok code.hazyhaar.fr/devhoros/php127 1.18s

---

### 4. Code Example: Full In-Process Pipeline

The following script demonstrates an entire microservice with attributes, traits, promoted constructor properties, fibers, and transactional database operations:

```php
trait LogTrait {
    public function log(string $msg): string {
        return monolog_log("INFO", $msg, "api");
    }
}

#[Route("/api/v1/orders")]
class OrderController {
    use LogTrait;

    public function __construct(public string $serviceName) {}

    public function createOrder(string $item, float $price): string {
        // 1. Asynchronous coroutine execution
        $fib = fiber_create(fn() => uuid_v7());
        $orderId = fiber_start($fib);

        // 2. Transactional relational database operations
        pdo_exec("CREATE TABLE IF NOT EXISTS orders (id, item, price)");
        pdo_exec("INSERT INTO orders (id, item, price) VALUES (?, ?, ?)", $orderId, $item, $price);

        $this->log("Created order {$orderId} for {$item}");
        return json_encode([
            "status" => "ok",
            "order_id" => $orderId,
            "service" => $this->serviceName
        ]);
    }
}

$controller = new OrderController("BillingCluster");
echo $controller->createOrder("Dedicated Server", 129.99);

Execution command:

./bin/php127 script.php

Output:

[2026-08-27 15:41:07] api.INFO: Created order 01a04373-f457-7bb3-852f-8fe5d63a140e for Dedicated Server [] []
{"status":"ok","order_id":"01a04373-f457-7bb3-852f-8fe5d63a140e","service":"BillingCluster"}

──────

5. Explicit Limitations: What php127 is NOT

To maintain honest expectations:

• Not a legacy drop-in for 30 years of php-src: We do not implement legacy 1990s procedural extensions (ext-soap, ext-imap, or unmaintained XML-RPC handlers). • Not a host for unmodified WordPress/Drupal monoliths: CMS architectures depending on legacy procedural C modules are outside our current target scope. • Target scope: Modern PHP 8.4 APIs, microservices, CLI workers, and containerized architectures that benefit from instant startup (< 1 ms), zero CGO dependencies, and single static binary distribution. ──────

6. Feedback & Discussion

The runtime is compiled as a static executable and can also be consumed as an embedded Go package.

https://github.com/hazyhaar/php127

We welcome your feedback:

1. Which specific PHP 8.4 or PSR features are critical for your microservice workloads?
2. Would an embedded pure-Go PHP runtime be useful in your current deployment pipelines?

[u/tsammons]

Code doesn't look AI since it's adorned with French. I'd fix formatting so it's less maladroit as you would say.

[u/hazyhaar → u/tsammons]

thanks. I just discovered the formatting button. my last posts were all bans.

[u/tsammons → u/hazyhaar]

Defeating automated filters with an unintelligible post is something else...

[u/exakat → u/tsammons]

Reading is a lot easier on the project site, indeed.

[u/FluffyDiscord]

I have no idea what i just read. Can human summarize this for me please? Hello? Any living being out there?

[u/hazyhaar → u/FluffyDiscord]

sure. Ask.

[u/MateusAzevedo]

Thanks, Claude, your post is unreadable. 1 star.