diff --git a/php/phpunit/.envrc b/php/phpunit/.envrc
new file mode 100644
index 0000000..5b0e956
--- /dev/null
+++ b/php/phpunit/.envrc
@@ -0,0 +1 @@
+use flake "git+https://code.oliverdavies.uk/opdavies/dev-shells#php84"
diff --git a/php/phpunit/.gitignore b/php/phpunit/.gitignore
new file mode 100644
index 0000000..6024272
--- /dev/null
+++ b/php/phpunit/.gitignore
@@ -0,0 +1,2 @@
+/.phpunit.cache
+/vendor/
diff --git a/php/phpunit/composer.json b/php/phpunit/composer.json
new file mode 100644
index 0000000..d09645a
--- /dev/null
+++ b/php/phpunit/composer.json
@@ -0,0 +1,15 @@
+{
+    "require-dev": {
+        "phpunit/phpunit": "^12.3"
+    },
+    "autoload": {
+        "psr-4": {
+            "App\\": "src/"
+        }
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "Tests\\": "tests/"
+        }
+    }
+}
diff --git a/php/phpunit/composer.lock b/php/phpunit/composer.lock
new file mode 100644
index 0000000..3b20b24
--- /dev/null
+++ b/php/phpunit/composer.lock
@@ -0,0 +1,1693 @@
+{
+    "_readme": [
+        "This file locks the dependencies of your project to a known state",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
+        "This file is @generated automatically"
+    ],
+    "content-hash": "82dc742f68db531670624e21bb81e7a1",
+    "packages": [],
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+                "reference": "07d290f0c47959fd5eed98c95ee5602db07e0b6a"
+            },
+            "dist": {
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+                "reference": "07d290f0c47959fd5eed98c95ee5602db07e0b6a",
+                "shasum": ""
+            },
+            "require": {
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+            },
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+            },
+            "require-dev": {
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+                "doctrine/common": "^2.13.3 || ^3.2.2",
+                "phpspec/prophecy": "^1.10",
+                "phpunit/phpunit": "^7.5.20 || ^8.5.23 || ^9.5.13"
+            },
+            "type": "library",
+            "autoload": {
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+                ],
+                "psr-4": {
+                    "DeepCopy\\": "src/DeepCopy/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "Create deep copies (clones) of your objects",
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+                "clone",
+                "copy",
+                "duplicate",
+                "object",
+                "object graph"
+            ],
+            "support": {
+                "issues": "https://github.com/myclabs/DeepCopy/issues",
+                "source": "https://github.com/myclabs/DeepCopy/tree/1.13.4"
+            },
+            "funding": [
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/myclabs/deep-copy",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2025-08-01T08:46:24+00:00"
+        },
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+                "url": "https://github.com/nikic/PHP-Parser.git",
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+            },
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+                "shasum": ""
+            },
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+                "ext-tokenizer": "*",
+                "php": ">=7.4"
+            },
+            "require-dev": {
+                "ircmaxell/php-yacc": "^0.0.7",
+                "phpunit/phpunit": "^9.0"
+            },
+            "bin": [
+                "bin/php-parse"
+            ],
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "5.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "PhpParser\\": "lib/PhpParser"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Nikita Popov"
+                }
+            ],
+            "description": "A PHP parser written in PHP",
+            "keywords": [
+                "parser",
+                "php"
+            ],
+            "support": {
+                "issues": "https://github.com/nikic/PHP-Parser/issues",
+                "source": "https://github.com/nikic/PHP-Parser/tree/v5.6.1"
+            },
+            "time": "2025-08-13T20:13:15+00:00"
+        },
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+            "name": "phar-io/manifest",
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+                "url": "https://github.com/phar-io/manifest.git",
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+            },
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+                "type": "zip",
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+                "ext-xmlwriter": "*",
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+                "php": "^7.2 || ^8.0"
+            },
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+                }
+            },
+            "autoload": {
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+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
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+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Heuer",
+                    "email": "sebastian@phpeople.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Component for reading phar.io manifest information from a PHP Archive (PHAR)",
+            "support": {
+                "issues": "https://github.com/phar-io/manifest/issues",
+                "source": "https://github.com/phar-io/manifest/tree/2.0.4"
+            },
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+                    "type": "github"
+                }
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+            "time": "2024-03-03T12:33:53+00:00"
+        },
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+            "name": "phar-io/version",
+            "version": "3.2.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phar-io/version.git",
+                "reference": "4f7fd7836c6f332bb2933569e566a0d6c4cbed74"
+            },
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+                "reference": "4f7fd7836c6f332bb2933569e566a0d6c4cbed74",
+                "shasum": ""
+            },
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+            "autoload": {
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+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
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+            ],
+            "authors": [
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+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                },
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+                    "email": "sebastian@phpeople.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Library for handling version information and constraints",
+            "support": {
+                "issues": "https://github.com/phar-io/version/issues",
+                "source": "https://github.com/phar-io/version/tree/3.2.1"
+            },
+            "time": "2022-02-21T01:04:05+00:00"
+        },
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+            "name": "phpunit/php-code-coverage",
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+            },
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+                "phpunit/php-text-template": "^5.0",
+                "sebastian/complexity": "^5.0",
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+            },
+            "require-dev": {
+                "phpunit/phpunit": "^12.3.7"
+            },
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+                "ext-xdebug": "PHP extension that provides line coverage as well as branch and path coverage"
+            },
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+            "license": [
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+                    "email": "sebastian@phpunit.de",
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+                "testing",
+                "xunit"
+            ],
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+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                },
+                {
+                    "url": "https://liberapay.com/sebastianbergmann",
+                    "type": "liberapay"
+                },
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+                    "url": "https://thanks.dev/u/gh/sebastianbergmann",
+                    "type": "thanks_dev"
+                },
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+        },
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+            "name": "phpunit/php-file-iterator",
+            "version": "6.0.0",
+            "source": {
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+            "license": [
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+            ],
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+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "FilterIterator implementation that filters files based on a list of suffixes.",
+            "homepage": "https://github.com/sebastianbergmann/php-file-iterator/",
+            "keywords": [
+                "filesystem",
+                "iterator"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/php-file-iterator/issues",
+                "security": "https://github.com/sebastianbergmann/php-file-iterator/security/policy",
+                "source": "https://github.com/sebastianbergmann/php-file-iterator/tree/6.0.0"
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+        },
+        {
+            "name": "phpunit/php-invoker",
+            "version": "6.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-invoker.git",
+                "reference": "12b54e689b07a25a9b41e57736dfab6ec9ae5406"
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+            },
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+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
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+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Invoke callables with a timeout",
+            "homepage": "https://github.com/sebastianbergmann/php-invoker/",
+            "keywords": [
+                "process"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/php-invoker/issues",
+                "security": "https://github.com/sebastianbergmann/php-invoker/security/policy",
+                "source": "https://github.com/sebastianbergmann/php-invoker/tree/6.0.0"
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+                    "type": "github"
+                }
+            ],
+            "time": "2025-02-07T04:58:58+00:00"
+        },
+        {
+            "name": "phpunit/php-text-template",
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+                "url": "https://github.com/sebastianbergmann/php-text-template.git",
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+            },
+            "dist": {
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+                    "role": "lead"
+                }
+            ],
+            "description": "Simple template engine.",
+            "homepage": "https://github.com/sebastianbergmann/php-text-template/",
+            "keywords": [
+                "template"
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+            "support": {
+                "issues": "https://github.com/sebastianbergmann/php-text-template/issues",
+                "security": "https://github.com/sebastianbergmann/php-text-template/security/policy",
+                "source": "https://github.com/sebastianbergmann/php-text-template/tree/5.0.0"
+            },
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+                    "type": "github"
+                }
+            ],
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+        },
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+            },
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+            },
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+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Utility class for timing",
+            "homepage": "https://github.com/sebastianbergmann/php-timer/",
+            "keywords": [
+                "timer"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/php-timer/issues",
+                "security": "https://github.com/sebastianbergmann/php-timer/security/policy",
+                "source": "https://github.com/sebastianbergmann/php-timer/tree/8.0.0"
+            },
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+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2025-02-07T04:59:38+00:00"
+        },
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diff --git a/php/phpunit/phpunit.xml b/php/phpunit/phpunit.xml
new file mode 100644
index 0000000..c7e4668
--- /dev/null
+++ b/php/phpunit/phpunit.xml
@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="vendor/phpunit/phpunit/phpunit.xsd"
+         bootstrap="vendor/autoload.php"
+         cacheDirectory=".phpunit.cache"
+         executionOrder="depends,defects"
+         beStrictAboutCoverageMetadata="true"
+         beStrictAboutOutputDuringTests="true"
+         displayDetailsOnPhpunitDeprecations="true"
+         failOnPhpunitDeprecation="true"
+         failOnRisky="true"
+         failOnWarning="true">
+    <testsuites>
+        <testsuite name="default">
+            <directory>tests</directory>
+        </testsuite>
+    </testsuites>
+
+    <source ignoreIndirectDeprecations="true" restrictNotices="true" restrictWarnings="true">
+        <include>
+            <directory>src</directory>
+        </include>
+    </source>
+</phpunit>
diff --git a/php/phpunit/src/Calculator.php b/php/phpunit/src/Calculator.php
new file mode 100644
index 0000000..b95ce92
--- /dev/null
+++ b/php/phpunit/src/Calculator.php
@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App;
+
+final class Calculator
+{
+    public function add(int $a, int $b): int
+    {
+        return $a + $b;
+    }
+}
diff --git a/php/phpunit/tests/CalculatorTest.php b/php/phpunit/tests/CalculatorTest.php
new file mode 100644
index 0000000..ceb7816
--- /dev/null
+++ b/php/phpunit/tests/CalculatorTest.php
@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests;
+
+use App\Calculator;
+use PHPUnit\Framework\TestCase;
+
+class CalculatorTest extends TestCase
+{
+    public function test_add(): void
+    {
+        $calculator = new Calculator();
+
+        $this->assertSame(3, $calculator->add(1, 2));
+    }
+}