A high-performance PHP extension for ScyllaDB and Apache Cassandra 3.0+, built on top of the ScyllaDB C/C++ Driver. Communicates exclusively over the native CQL binary protocol.

The extension is actively being migrated from C++ to C23 for improved performance, safety, and maintainability.

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Compatibility

Component	Supported versions
PHP	8.2, 8.3, 8.4, 8.5
ScyllaDB	4.4.x, 5.x, 6.x
Apache Cassandra	3.0+ (via DataStax libcassandra)
Architecture	x86-64 (64-bit only)
Thread safety	NTS and ZTS
Compilers	GCC 13+, Clang 16+
OS	Linux, macOS

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Quick Start

<?php

$session = Cassandra::cluster()
    ->withContactPoints('127.0.0.1')
    ->withPort(9042)
    ->withCredentials('cassandra', 'cassandra')
    ->withTokenAwareRouting(true)
    ->build()
    ->connect('my_keyspace');

// Simple string query
$session->execute("INSERT INTO users (id, name) VALUES (uuid(), 'Alice')");

// Prepared statement with bound values
$prepared = $session->prepare('SELECT * FROM users WHERE id = ?');
$result = $session->execute($prepared, ['arguments' => [$id]]);

foreach ($result as $row) {
    printf("User: %s\n", $row['name']);
}

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Installation

Via PIE (recommended)

PIE is the official PHP extension installer. It handles downloading, building, and installing the extension in a single command.

Package: codelieutenant/scylla-driver

1. Install native dependencies

PIE builds the extension from source, so libuv and the C/C++ driver must be present first.

# libuv
./scripts/compile-libuv.sh --prefix ~/.local

# ScyllaDB driver (default)
./scripts/compile-cpp-driver.sh --driver scylladb --prefix ~/.local

# — or — DataStax Cassandra driver
./scripts/compile-cpp-driver.sh --driver cassandra --prefix ~/.local

Export the pkg-config path so CMake can find both libraries:

export PKG_CONFIG_PATH="$HOME/.local/lib/pkgconfig:$PKG_CONFIG_PATH"

2. Install with PIE

# ScyllaDB driver (default)
pie install codelieutenant/scylla-driver

# DataStax Cassandra driver
pie install codelieutenant/scylla-driver --enable-libcassandra

PIE places the compiled cassandra.so in your PHP extension directory and enables it automatically.

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Manual build from source

Prerequisites

The driver requires libuv and the ScyllaDB C/C++ driver (or DataStax libcassandra). Use the provided scripts to build them from source:

# Install libuv (latest stable)
./scripts/compile-libuv.sh --prefix ~/.local

# Install the ScyllaDB C/C++ driver
./scripts/compile-cpp-driver.sh --driver scylladb --prefix ~/.local

# Build PHP with debug symbols (optional, for development)
./scripts/compile-php.sh -v 8.4 -d -o ./php

System packages (Debian/Ubuntu)

apt install -y build-essential ninja-build cmake \
    libssl-dev libgmp-dev zlib1g-dev libpcre3-dev

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Building the Extension

The project uses CMake with presets for common configurations. Preset names follow the pattern <BuildType>PHP<Version><ThreadModel>, e.g. DebugPHP8.4NTS.

Configure and compile

# List all available presets
cmake --list-presets

# Configure (e.g. debug build, PHP 8.4, non-thread-safe)
cmake --preset DebugPHP8.4NTS

# Compile
cmake --build out/DebugPHP8.4NTS

Available build types

Preset prefix	Description
Debug	Debug symbols, no optimisations
Release	Fully optimised
RelWithDebugInfo	Optimised with debug info

CMake options

option(ENABLE_SANITIZERS   "Enable AddressSanitizer + UndefinedSanitizer" OFF)
option(ENABLE_AVX          "Enable AVX instruction set"                   OFF)
option(ENABLE_AVX2         "Enable AVX2 instruction set"                  OFF)
option(ENABLE_LTO          "Enable Link-Time Optimisation"                OFF)

set(CPU_TYPE "x86-64-v3" CACHE STRING
    "x86-64 micro-arch: x86-64 | x86-64-v2 | x86-64-v3 | x86-64-v4 | native")

# PHP
set(PHP_VERSION_FOR_PHP_CONFIG "8.4" CACHE STRING "PHP version")
option(PHP_DEBUG       "Debug build of PHP"    ON)
option(PHP_THREAD_SAFE "ZTS (thread-safe) PHP" OFF)

# Linking
option(LINK_LIBUV_STATIC    "Statically link libuv"             OFF)
option(PHP_DRIVER_STATIC    "Statically link the PHP driver"    OFF)
option(USE_LIBCASSANDRA     "Use DataStax libcassandra instead" OFF)

Regenerating CMake presets

After adding a new PHP version, regenerate CMakePresets.json:

php generate-presets.php

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Running Tests

Start a local ScyllaDB node, then run the Pest test suite:

# 1. Start ScyllaDB via Docker Compose
./scripts/run-scylladb.sh

# 2. Build the extension
cmake --preset DebugPHP8.4NTS
cmake --build out/DebugPHP8.4NTS

# 3. Install Composer dependencies
composer install

# 4. Run tests
php ./vendor/bin/pest

Environment variables for the test suite:

Variable	Default	Description
SCYLLADB_HOSTS	127.0.0.1	Comma-separated list of nodes
SCYLLADB_PORT	9042	CQL native port
SCYLLADB_USERNAME	cassandra	Username
SCYLLADB_PASSWORD	cassandra	Password
SCYLLADB_KEYSPACE	(empty)	Default keyspace

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Development Status

The extension is undergoing an incremental C++ → C23 migration. The src/Cluster/ module is the canonical reference implementation.

Module	Status
Cluster	Refactored (C23 reference)
RetryPolicy	Partial — stubs done, handlers need C port
DateTime	Partial — stubs done
SSLOptions	Partial — stubs done
Database	Legacy
Type	Legacy
Numbers	Legacy
TimestampGenerator	Legacy
Exception	Legacy (thin wrappers)

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Contributing

• Bug reports — please include driver version, PHP version, ScyllaDB version, dependency versions, a full stack trace, and steps to reproduce.
• Pull requests — fork the repository and open a PR. See CONTRIBUTING.md for the full contribution guide.
• Questions / discussions — join the ScyllaDB Developers Discord.

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License

Copyright © DataStax, Inc. and contributors.

Licensed under the Apache License, Version 2.0.