diff --git a/.github/workflows/test-all.yaml b/.github/workflows/test-all.yaml
index 3646199f3c43..065698e9baca 100644
--- a/.github/workflows/test-all.yaml
+++ b/.github/workflows/test-all.yaml
@@ -32,6 +32,9 @@ jobs:
       os: ${{ matrix.os }}
       target_option: ${{ matrix.target_option }}
 
+  test-php:
+    uses: ./.github/workflows/test-php.yaml
+
   test-python:
     uses: ./.github/workflows/test-python.yaml
 
diff --git a/.github/workflows/test-php.yaml b/.github/workflows/test-php.yaml
new file mode 100644
index 000000000000..af2b19202350
--- /dev/null
+++ b/.github/workflows/test-php.yaml
@@ -0,0 +1,42 @@
+name: test-php
+
+on:
+  pull_request:
+    paths:
+      - "prql-php/**"
+      - ".github/workflows/test-php.yaml"
+  workflow_call:
+
+concurrency:
+  # See notes in `pull-request.yaml`
+  group: ${{ github.workflow }}-${{ github.ref }}-php
+  cancel-in-progress: true
+
+jobs:
+  test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+    steps:
+      - name: 📂 Checkout code
+        uses: actions/checkout@v3
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+      - run: cargo build
+        working-directory: prql-lib
+      - run: |
+          mv ../target/debug/libprql_lib.so ../prql-php/src/libprql_lib.so
+          ls -l ../target/debug/
+          uname -a
+          ls -lR ../prql-php/
+        working-directory: prql-lib
+      - name: 📦 Install dependencies using Composer
+        uses: php-actions/composer@v6
+        with:
+          args: --working-dir=prql-php
+          php_extensions: FFI
+      - name: 🧪 Run tests using PHPUnit
+        run: vendor/bin/phpunit tests
+        working-directory: prql-php
diff --git a/book/src/bindings/README.md b/book/src/bindings/README.md
index f7056439154f..7d02f68f90dc 100644
--- a/book/src/bindings/README.md
+++ b/book/src/bindings/README.md
@@ -4,6 +4,7 @@ PRQL has bindings for many languages. These include:
 
 - [Java](./java.md)
 - [JavaScript](./javascript.md)
+- [PHP](./php.md)
 - [Python](./python.md)
 - [R](./r.md)
 - [Rust](./rust.md)
diff --git a/book/src/bindings/php.md b/book/src/bindings/php.md
new file mode 100644
index 000000000000..e168db425270
--- /dev/null
+++ b/book/src/bindings/php.md
@@ -0,0 +1 @@
+{{#include ../../../prql-php/README.md}}
diff --git a/prql-php/.gitignore b/prql-php/.gitignore
new file mode 100644
index 000000000000..61ead86667ca
--- /dev/null
+++ b/prql-php/.gitignore
@@ -0,0 +1 @@
+/vendor
diff --git a/prql-php/README.md b/prql-php/README.md
new file mode 100644
index 000000000000..3b417479a4c4
--- /dev/null
+++ b/prql-php/README.md
@@ -0,0 +1,25 @@
+# prql-php
+
+`prql-php` offers PHP bindings through FFI.
+
+It provides the `Compiler` class which contains the `toJson` and `toSql`
+methods.
+
+It's still at an early stage, and isn't published to Composer. Contributions are
+welcome.
+
+## Installation
+
+The [PHP FFI extension](https://www.php.net/manual/en/book.ffi.php) needs to be
+enabled. Set `ffi.enable` in your php.ini configuration file to `"true"`.
+
+## Usage
+
+```php
+<?php
+
+use Prql\Compiler\Compiler;
+
+$prql = new Compiler();
+$result = $prql->toSql("from employees");
+```
diff --git a/prql-php/composer.json b/prql-php/composer.json
new file mode 100644
index 000000000000..7fad323e451e
--- /dev/null
+++ b/prql-php/composer.json
@@ -0,0 +1,37 @@
+{
+  "name": "prql/compiler",
+  "description": "PRQL compiler bindings.",
+  "keywords": [
+    "prql",
+    "sql"
+  ],
+  "homepage": "https://prql-lang.org/",
+  "type": "library",
+  "license": "Apache-2.0",
+  "autoload": {
+    "psr-4": {
+      "Prql\\Compiler\\": "src/"
+    }
+  },
+  "autoload-dev": {
+    "psr-4": {
+      "Prql\\Tests\\": "tests/"
+    }
+  },
+  "authors": [
+    {
+      "name": "Jonathan"
+    }
+  ],
+  "support": {
+    "issues": "https://github.com/PRQL/prql/issues",
+    "source": "https://github.com/PRQL/prql",
+    "docs": "https://prql-lang.org/book/"
+  },
+  "require": {
+    "ext-ffi": "*"
+  },
+  "require-dev": {
+    "phpunit/phpunit": "^10"
+  }
+}
diff --git a/prql-php/composer.lock b/prql-php/composer.lock
new file mode 100644
index 000000000000..bb8cb1d27700
--- /dev/null
+++ b/prql-php/composer.lock
@@ -0,0 +1,1471 @@
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+    "This file locks the dependencies of your project to a known state",
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+        "reference": "14daed4296fae74d9e3201d2c4925d1acb7aa614"
+      },
+      "dist": {
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+        "shasum": ""
+      },
+      "require": {
+        "php": "^7.1 || ^8.0"
+      },
+      "conflict": {
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+        "doctrine/common": "<2.13.3 || >=3,<3.2.2"
+      },
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+    },
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+      },
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+          "role": "Developer"
+        },
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+          "email": "sebastian@phpeople.de",
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+        },
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+        "reference": "4f7fd7836c6f332bb2933569e566a0d6c4cbed74"
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+          "role": "Developer"
+        },
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+          "email": "sebastian@phpeople.de",
+          "role": "Developer"
+        },
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+          "name": "Sebastian Bergmann",
+          "email": "sebastian@phpunit.de",
+          "role": "Developer"
+        }
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+      "support": {
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+        "source": "https://github.com/phar-io/version/tree/3.2.1"
+      },
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+        "type": "git",
+        "url": "https://github.com/sebastianbergmann/lines-of-code.git",
+        "reference": "17c4d940ecafb3d15d2cf916f4108f664e28b130"
+      },
+      "dist": {
+        "type": "zip",
+        "url": "https://api.github.com/repos/sebastianbergmann/lines-of-code/zipball/17c4d940ecafb3d15d2cf916f4108f664e28b130",
+        "reference": "17c4d940ecafb3d15d2cf916f4108f664e28b130",
+        "shasum": ""
+      },
+      "require": {
+        "nikic/php-parser": "^4.10",
+        "php": ">=8.1"
+      },
+      "require-dev": {
+        "phpunit/phpunit": "^10.0"
+      },
+      "type": "library",
+      "extra": {
+        "branch-alias": {
+          "dev-main": "2.0-dev"
+        }
+      },
+      "autoload": {
+        "classmap": ["src/"]
+      },
+      "notification-url": "https://packagist.org/downloads/",
+      "license": ["BSD-3-Clause"],
+      "authors": [
+        {
+          "name": "Sebastian Bergmann",
+          "email": "sebastian@phpunit.de",
+          "role": "lead"
+        }
+      ],
+      "description": "Library for counting the lines of code in PHP source code",
+      "homepage": "https://github.com/sebastianbergmann/lines-of-code",
+      "support": {
+        "issues": "https://github.com/sebastianbergmann/lines-of-code/issues",
+        "source": "https://github.com/sebastianbergmann/lines-of-code/tree/2.0.0"
+      },
+      "funding": [
+        {
+          "url": "https://github.com/sebastianbergmann",
+          "type": "github"
+        }
+      ],
+      "time": "2023-02-03T07:08:02+00:00"
+    },
+    {
+      "name": "sebastian/object-enumerator",
+      "version": "5.0.0",
+      "source": {
+        "type": "git",
+        "url": "https://github.com/sebastianbergmann/object-enumerator.git",
+        "reference": "202d0e344a580d7f7d04b3fafce6933e59dae906"
+      },
+      "dist": {
+        "type": "zip",
+        "url": "https://api.github.com/repos/sebastianbergmann/object-enumerator/zipball/202d0e344a580d7f7d04b3fafce6933e59dae906",
+        "reference": "202d0e344a580d7f7d04b3fafce6933e59dae906",
+        "shasum": ""
+      },
+      "require": {
+        "php": ">=8.1",
+        "sebastian/object-reflector": "^3.0",
+        "sebastian/recursion-context": "^5.0"
+      },
+      "require-dev": {
+        "phpunit/phpunit": "^10.0"
+      },
+      "type": "library",
+      "extra": {
+        "branch-alias": {
+          "dev-main": "5.0-dev"
+        }
+      },
+      "autoload": {
+        "classmap": ["src/"]
+      },
+      "notification-url": "https://packagist.org/downloads/",
+      "license": ["BSD-3-Clause"],
+      "authors": [
+        {
+          "name": "Sebastian Bergmann",
+          "email": "sebastian@phpunit.de"
+        }
+      ],
+      "description": "Traverses array structures and object graphs to enumerate all referenced objects",
+      "homepage": "https://github.com/sebastianbergmann/object-enumerator/",
+      "support": {
+        "issues": "https://github.com/sebastianbergmann/object-enumerator/issues",
+        "source": "https://github.com/sebastianbergmann/object-enumerator/tree/5.0.0"
+      },
+      "funding": [
+        {
+          "url": "https://github.com/sebastianbergmann",
+          "type": "github"
+        }
+      ],
+      "time": "2023-02-03T07:08:32+00:00"
+    },
+    {
+      "name": "sebastian/object-reflector",
+      "version": "3.0.0",
+      "source": {
+        "type": "git",
+        "url": "https://github.com/sebastianbergmann/object-reflector.git",
+        "reference": "24ed13d98130f0e7122df55d06c5c4942a577957"
+      },
+      "dist": {
+        "type": "zip",
+        "url": "https://api.github.com/repos/sebastianbergmann/object-reflector/zipball/24ed13d98130f0e7122df55d06c5c4942a577957",
+        "reference": "24ed13d98130f0e7122df55d06c5c4942a577957",
+        "shasum": ""
+      },
+      "require": {
+        "php": ">=8.1"
+      },
+      "require-dev": {
+        "phpunit/phpunit": "^10.0"
+      },
+      "type": "library",
+      "extra": {
+        "branch-alias": {
+          "dev-main": "3.0-dev"
+        }
+      },
+      "autoload": {
+        "classmap": ["src/"]
+      },
+      "notification-url": "https://packagist.org/downloads/",
+      "license": ["BSD-3-Clause"],
+      "authors": [
+        {
+          "name": "Sebastian Bergmann",
+          "email": "sebastian@phpunit.de"
+        }
+      ],
+      "description": "Allows reflection of object attributes, including inherited and non-public ones",
+      "homepage": "https://github.com/sebastianbergmann/object-reflector/",
+      "support": {
+        "issues": "https://github.com/sebastianbergmann/object-reflector/issues",
+        "source": "https://github.com/sebastianbergmann/object-reflector/tree/3.0.0"
+      },
+      "funding": [
+        {
+          "url": "https://github.com/sebastianbergmann",
+          "type": "github"
+        }
+      ],
+      "time": "2023-02-03T07:06:18+00:00"
+    },
+    {
+      "name": "sebastian/recursion-context",
+      "version": "5.0.0",
+      "source": {
+        "type": "git",
+        "url": "https://github.com/sebastianbergmann/recursion-context.git",
+        "reference": "05909fb5bc7df4c52992396d0116aed689f93712"
+      },
+      "dist": {
+        "type": "zip",
+        "url": "https://api.github.com/repos/sebastianbergmann/recursion-context/zipball/05909fb5bc7df4c52992396d0116aed689f93712",
+        "reference": "05909fb5bc7df4c52992396d0116aed689f93712",
+        "shasum": ""
+      },
+      "require": {
+        "php": ">=8.1"
+      },
+      "require-dev": {
+        "phpunit/phpunit": "^10.0"
+      },
+      "type": "library",
+      "extra": {
+        "branch-alias": {
+          "dev-main": "5.0-dev"
+        }
+      },
+      "autoload": {
+        "classmap": ["src/"]
+      },
+      "notification-url": "https://packagist.org/downloads/",
+      "license": ["BSD-3-Clause"],
+      "authors": [
+        {
+          "name": "Sebastian Bergmann",
+          "email": "sebastian@phpunit.de"
+        },
+        {
+          "name": "Jeff Welch",
+          "email": "whatthejeff@gmail.com"
+        },
+        {
+          "name": "Adam Harvey",
+          "email": "aharvey@php.net"
+        }
+      ],
+      "description": "Provides functionality to recursively process PHP variables",
+      "homepage": "https://github.com/sebastianbergmann/recursion-context",
+      "support": {
+        "issues": "https://github.com/sebastianbergmann/recursion-context/issues",
+        "source": "https://github.com/sebastianbergmann/recursion-context/tree/5.0.0"
+      },
+      "funding": [
+        {
+          "url": "https://github.com/sebastianbergmann",
+          "type": "github"
+        }
+      ],
+      "time": "2023-02-03T07:05:40+00:00"
+    },
+    {
+      "name": "sebastian/type",
+      "version": "4.0.0",
+      "source": {
+        "type": "git",
+        "url": "https://github.com/sebastianbergmann/type.git",
+        "reference": "462699a16464c3944eefc02ebdd77882bd3925bf"
+      },
+      "dist": {
+        "type": "zip",
+        "url": "https://api.github.com/repos/sebastianbergmann/type/zipball/462699a16464c3944eefc02ebdd77882bd3925bf",
+        "reference": "462699a16464c3944eefc02ebdd77882bd3925bf",
+        "shasum": ""
+      },
+      "require": {
+        "php": ">=8.1"
+      },
+      "require-dev": {
+        "phpunit/phpunit": "^10.0"
+      },
+      "type": "library",
+      "extra": {
+        "branch-alias": {
+          "dev-main": "4.0-dev"
+        }
+      },
+      "autoload": {
+        "classmap": ["src/"]
+      },
+      "notification-url": "https://packagist.org/downloads/",
+      "license": ["BSD-3-Clause"],
+      "authors": [
+        {
+          "name": "Sebastian Bergmann",
+          "email": "sebastian@phpunit.de",
+          "role": "lead"
+        }
+      ],
+      "description": "Collection of value objects that represent the types of the PHP type system",
+      "homepage": "https://github.com/sebastianbergmann/type",
+      "support": {
+        "issues": "https://github.com/sebastianbergmann/type/issues",
+        "source": "https://github.com/sebastianbergmann/type/tree/4.0.0"
+      },
+      "funding": [
+        {
+          "url": "https://github.com/sebastianbergmann",
+          "type": "github"
+        }
+      ],
+      "time": "2023-02-03T07:10:45+00:00"
+    },
+    {
+      "name": "sebastian/version",
+      "version": "4.0.1",
+      "source": {
+        "type": "git",
+        "url": "https://github.com/sebastianbergmann/version.git",
+        "reference": "c51fa83a5d8f43f1402e3f32a005e6262244ef17"
+      },
+      "dist": {
+        "type": "zip",
+        "url": "https://api.github.com/repos/sebastianbergmann/version/zipball/c51fa83a5d8f43f1402e3f32a005e6262244ef17",
+        "reference": "c51fa83a5d8f43f1402e3f32a005e6262244ef17",
+        "shasum": ""
+      },
+      "require": {
+        "php": ">=8.1"
+      },
+      "type": "library",
+      "extra": {
+        "branch-alias": {
+          "dev-main": "4.0-dev"
+        }
+      },
+      "autoload": {
+        "classmap": ["src/"]
+      },
+      "notification-url": "https://packagist.org/downloads/",
+      "license": ["BSD-3-Clause"],
+      "authors": [
+        {
+          "name": "Sebastian Bergmann",
+          "email": "sebastian@phpunit.de",
+          "role": "lead"
+        }
+      ],
+      "description": "Library that helps with managing the version number of Git-hosted PHP projects",
+      "homepage": "https://github.com/sebastianbergmann/version",
+      "support": {
+        "issues": "https://github.com/sebastianbergmann/version/issues",
+        "source": "https://github.com/sebastianbergmann/version/tree/4.0.1"
+      },
+      "funding": [
+        {
+          "url": "https://github.com/sebastianbergmann",
+          "type": "github"
+        }
+      ],
+      "time": "2023-02-07T11:34:05+00:00"
+    },
+    {
+      "name": "theseer/tokenizer",
+      "version": "1.2.1",
+      "source": {
+        "type": "git",
+        "url": "https://github.com/theseer/tokenizer.git",
+        "reference": "34a41e998c2183e22995f158c581e7b5e755ab9e"
+      },
+      "dist": {
+        "type": "zip",
+        "url": "https://api.github.com/repos/theseer/tokenizer/zipball/34a41e998c2183e22995f158c581e7b5e755ab9e",
+        "reference": "34a41e998c2183e22995f158c581e7b5e755ab9e",
+        "shasum": ""
+      },
+      "require": {
+        "ext-dom": "*",
+        "ext-tokenizer": "*",
+        "ext-xmlwriter": "*",
+        "php": "^7.2 || ^8.0"
+      },
+      "type": "library",
+      "autoload": {
+        "classmap": ["src/"]
+      },
+      "notification-url": "https://packagist.org/downloads/",
+      "license": ["BSD-3-Clause"],
+      "authors": [
+        {
+          "name": "Arne Blankerts",
+          "email": "arne@blankerts.de",
+          "role": "Developer"
+        }
+      ],
+      "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
+      "support": {
+        "issues": "https://github.com/theseer/tokenizer/issues",
+        "source": "https://github.com/theseer/tokenizer/tree/1.2.1"
+      },
+      "funding": [
+        {
+          "url": "https://github.com/theseer",
+          "type": "github"
+        }
+      ],
+      "time": "2021-07-28T10:34:58+00:00"
+    }
+  ],
+  "aliases": [],
+  "minimum-stability": "stable",
+  "stability-flags": [],
+  "prefer-stable": false,
+  "prefer-lowest": false,
+  "platform": {
+    "ext-ffi": "*"
+  },
+  "platform-dev": [],
+  "plugin-api-version": "2.3.0"
+}
diff --git a/prql-php/src/Compiler.php b/prql-php/src/Compiler.php
new file mode 100644
index 000000000000..5be55ea51962
--- /dev/null
+++ b/prql-php/src/Compiler.php
@@ -0,0 +1,162 @@
+<?php
+
+/**
+ * PRQL compiler bindings.
+ *
+ * This library requires the PHP FFI extension.
+ * It also requires the libprql_lib library.
+ *
+ * PHP version 8.0
+ *
+ * @api
+ * @package   Prql\Compiler
+ * @author    PRQL
+ * @copyright 2023 PRQL
+ * @license   https://spdx.org/licenses/Apache-2.0.html Apache License 2.0
+ * @link      https://prql-lang.org/
+ */
+
+declare(strict_types=1);
+
+namespace Prql\Compiler;
+
+/**
+ * The PRQL compiler transpiles PRQL queries.
+ *
+ * @package Prql\Compiler
+ * @author  PRQL
+ * @license https://spdx.org/licenses/Apache-2.0.html Apache License 2.0
+ * @link    https://prql-lang.org/
+ */
+final class Compiler
+{
+    /**
+     * Compile a PRQL string into a SQL string.
+     *
+     * @param string       $prql_query A PRQL query.
+     * @param Options|null $options    PRQL compiler options.
+     *
+     * @return string SQL query.
+     * @throws \InvalidArgumentException If no query is given or the query cannot
+     * @api
+     * be compiled.
+     * @todo   FIX THIS. THIS DOES NOT WORK!
+     * @ignore Ignore this function until fixed.
+     */
+    function compile(string $prql_query, ?Options $options = null): string
+    {
+        if (!$prql_query) {
+            throw new \InvalidArgumentException("No query given.");
+        }
+
+        if ($options === null) {
+            $options = new Options();
+        }
+
+        $library = "/libprql_lib.so";
+
+        if (PHP_OS_FAMILY === "Windows") {
+            $library = "\libprql_lib.dll";
+        }
+
+        $libprql = \FFI::cdef(
+            "
+            struct options {
+                bool format;
+                char* target;
+                bool signature_comment;
+            };
+
+            char* compile(const char *prql_query, struct options *opt);
+        ", __DIR__ . $library
+        );
+
+        $ffi_options = $libprql->new("struct options");
+        $ffi_options->format = $options->format;
+        $ffi_options->signature_comment = $options->signature_comment;
+
+        if (isset($options->target)) {
+            $target_len = strlen($options->target);
+            $ffi_options->target = $ffi->new('char[$target_len]', 0);
+            FFI::memcpy($ffi_options->target, $options->target, $target_len);
+            FFI::free($ffi_options->target);
+        }
+
+        $out = str_pad("", 1024);
+        if ($libprql->compile($prql_query, \FFI::addr($$ffi_options)) !== 0) {
+            throw new \InvalidArgumentException("Could not compile query.");
+        }
+
+        return trim($out);
+    }
+
+    /**
+     * Compile a PRQL string into a JSON string.
+     *
+     * @param string $prql_query A PRQL query.
+     *
+     * @return string JSON string.
+     * @throws \InvalidArgumentException If no query is given or the query cannot
+     * be compiled.
+     * @api
+     */
+    function toJson(string $prql_query): string
+    {
+        if (!$prql_query) {
+            throw new \InvalidArgumentException("No query given.");
+        }
+
+        $library = "/libprql_lib.so";
+
+        if (PHP_OS_FAMILY === "Windows") {
+            $library = "\libprql_lib.dll";
+        }
+
+        $libprql = \FFI::cdef(
+            "int to_json(char *prql_query, char *json_query);",
+            __DIR__ . $library
+        );
+
+        $out = str_pad("", 1024);
+        if ($libprql->to_json($prql_query, $out) !== 0) {
+            throw new \InvalidArgumentException("Could not compile query.");
+        }
+
+        return trim($out);
+    }
+
+    /**
+     * Compile a PRQL string into a SQL string.
+     *
+     * @param string $prql_query A PRQL query.
+     *
+     * @return string SQL query.
+     * @throws \InvalidArgumentException If no query is given or the query cannot
+     * be compiled.
+     * @api
+     */
+    function toSql(string $prql_query): string
+    {
+        if (!$prql_query) {
+            throw new \InvalidArgumentException("No query given.");
+        }
+
+        $library = "/libprql_lib.so";
+
+        if (PHP_OS_FAMILY === "Windows") {
+            $library = "\libprql_lib.dll";
+        }
+
+        $libprql = \FFI::cdef(
+            "int to_sql(char *prql_query, char *sql_query);",
+            __DIR__ . $library
+        );
+
+        $out = str_pad("", 1024);
+        if ($libprql->to_sql($prql_query, $out) !== 0) {
+            throw new \InvalidArgumentException("Could not compile query.");
+        }
+
+        return trim($out);
+    }
+}
diff --git a/prql-php/src/Options.php b/prql-php/src/Options.php
new file mode 100644
index 000000000000..3b76344df3e2
--- /dev/null
+++ b/prql-php/src/Options.php
@@ -0,0 +1,54 @@
+<?php
+
+/**
+ * PRQL compiler bindings.
+ *
+ * This library requires the PHP FFI extension.
+ * It also requires the libprql_lib library.
+ *
+ * PHP version 8.0
+ *
+ * @api
+ * @package   Prql\Compiler
+ * @author    PRQL
+ * @copyright 2023 PRQL
+ * @license   https://spdx.org/licenses/Apache-2.0.html Apache License 2.0
+ * @link      https://prql-lang.org/
+ */
+
+declare(strict_types=1);
+
+namespace Prql\Compiler;
+
+/**
+ * Compilation options for SQL backend of the compiler.
+ *
+ * @package Prql\Compiler
+ * @author  PRQL
+ * @license https://spdx.org/licenses/Apache-2.0.html Apache License 2.0
+ * @link    https://prql-lang.org/
+ */
+class Options
+{
+    /**
+     * Pass generated SQL string trough a formatter that splits it into
+     * multiple lines and prettifies indentation and spacing.
+     *
+     * @var bool
+     */
+    public bool $format = true;
+
+    /**
+     * Target and dialect to compile to.
+     *
+     * @var string|null
+     */
+    public ?string $target;
+
+    /**
+     * Emits the compiler signature as a comment after generated SQL.
+     *
+     * @var bool
+     */
+    public bool $signature_comment = true;
+}
diff --git a/prql-php/tests/CompilerTest.php b/prql-php/tests/CompilerTest.php
new file mode 100644
index 000000000000..a21957c17b47
--- /dev/null
+++ b/prql-php/tests/CompilerTest.php
@@ -0,0 +1,49 @@
+<?php declare(strict_types=1);
+
+use Prql\Compiler\Compiler;
+use PHPUnit\Framework\TestCase;
+
+final class CompilerTest extends TestCase
+{
+    public function testFfiExtensionIsLoaded(): void
+    {
+        $this->assertTrue(extension_loaded("ffi"));
+    }
+
+    public function testPrqlLibraryFileExists(): void
+    {
+        $this->assertFileExists("src/libprql_lib.so");
+    }
+
+    public function testPrqlLibraryLoads(): void
+    {
+        $code = "int to_sql(char *prql_query, char *sql_query);";
+        $ffi = FFI::cdef($code, "src/libprql_lib.so");
+        $this->assertInstanceOf(FFI::class, $ffi);
+    }
+
+    public function testInvalidQueryThrows(): void
+    {
+        $this->expectException(\InvalidArgumentException::class);
+
+        $prql = new Compiler();
+        $prql->toSql("invalid");
+    }
+
+    public function testToSqlWorks(): void
+    {
+        $expected = <<<'EOD'
+SELECT
+  *
+FROM
+  employees
+
+-- Generated by PRQL compiler version:0.5.0 (https://prql-lang.org)
+EOD;
+        $expected = substr($expected, 0, strpos($expected, "Generated by PRQL compiler"));
+        $prql = new Compiler();
+        $actual = $prql->toSql("from employees");
+        $actual = substr($actual, 0, strpos($actual, "Generated by PRQL compiler"));
+        $this->assertEquals($expected, $actual);
+    }
+}