diff --git a/.circleci/config.yml b/.circleci/config.yml
new file mode 100644
index 0000000..85e4c3e
--- /dev/null
+++ b/.circleci/config.yml
@@ -0,0 +1,21 @@
+version: '2.1'
+
+jobs:
+    ValidateBenchmark:
+        docker:
+            - image: phpbenchmarks/benchmark-kit:4
+        working_directory: /var/www/benchmark
+        steps:
+            - checkout
+            - run:
+                name: entrypoint
+                command: entrypoint --nginx-as-service
+            - run:
+                name: "validate:benchmark"
+                command: "phpbenchkit validate:benchmark -vvv"
+
+workflows:
+    version: '2.1'
+    BenchmarkKit:
+        jobs:
+            - ValidateBenchmark
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..e0d383d
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+/.idea
+/vendor
+/composer.lock
diff --git a/.phpbenchmarks/config.yml b/.phpbenchmarks/config.yml
new file mode 100644
index 0000000..8e6d9b1
--- /dev/null
+++ b/.phpbenchmarks/config.yml
@@ -0,0 +1,12 @@
+component:
+    slug: php
+benchmark:
+    type: json-serialization-hello-world
+    relativeUrl: /
+sourceCode:
+    entryPoint: public/index.php
+    urls:
+        jsonSerialization: https://github.com/phpbenchmarks/php/tree/8.0.0_json-serialization-hello-world_0/public/index.php#L12
+coreDependency:
+    name: php
+    version: 8.0.0
diff --git a/.phpbenchmarks/nginx/vhost.conf b/.phpbenchmarks/nginx/vhost.conf
new file mode 100644
index 0000000..9c166a9
--- /dev/null
+++ b/.phpbenchmarks/nginx/vhost.conf
@@ -0,0 +1,15 @@
+server {
+    listen ____PORT____;
+    server_name ____HOST____;
+    root ____INSTALLATION_PATH____/____ENTRY_POINT_FILE_PATH____;
+    location / {
+        try_files $uri /____ENTRY_POINT_FILE_NAME____$is_args$args;
+    }
+    location ~ ____ENTRY_POINT_FILE_NAME____(/|$) {
+        fastcgi_pass unix:/run/php/____PHP_FPM_SOCK____;
+        fastcgi_split_path_info ^(.+.php)(/.*)$;
+        include fastcgi_params;
+        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
+        fastcgi_param HTTPS off;
+    }
+}
diff --git a/.phpbenchmarks/php/8.0/composer.lock b/.phpbenchmarks/php/8.0/composer.lock
new file mode 100644
index 0000000..7ba3a51
--- /dev/null
+++ b/.phpbenchmarks/php/8.0/composer.lock
@@ -0,0 +1,52 @@
+{
+    "_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": "0c0625989f8d83f8b86f1bbfd2180ec8",
+    "packages": [
+        {
+            "name": "phpbenchmarks/benchmark-json-serialization-hello-world",
+            "version": "1.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpbenchmarks/benchmark-json-serialization-hello-world.git",
+                "reference": "9284d31f5ebf7fc9d61dec4e6caf93f45545d7bc"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpbenchmarks/benchmark-json-serialization-hello-world/zipball/9284d31f5ebf7fc9d61dec4e6caf93f45545d7bc",
+                "reference": "9284d31f5ebf7fc9d61dec4e6caf93f45545d7bc",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.4.0"
+            },
+            "type": "project",
+            "autoload": {
+                "psr-4": {
+                    "PhpBenchmarks\\BenchmarkJsonSerializationHelloWorld\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "proprietary"
+            ],
+            "description": "Data for JSON serialization of Hello world benchmark on phpbenchmarks.com.",
+            "time": "2019-05-11T19:31:47+00:00"
+        }
+    ],
+    "packages-dev": [],
+    "aliases": [],
+    "minimum-stability": "stable",
+    "stability-flags": [],
+    "prefer-stable": false,
+    "prefer-lowest": false,
+    "platform": {
+        "php": "8.0.0",
+        "ext-json": "*"
+    },
+    "platform-dev": [],
+    "plugin-api-version": "1.1.0"
+}
diff --git a/.phpbenchmarks/php/8.0/initBenchmark.sh b/.phpbenchmarks/php/8.0/initBenchmark.sh
new file mode 100755
index 0000000..011058f
--- /dev/null
+++ b/.phpbenchmarks/php/8.0/initBenchmark.sh
@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+
+set -e
+
+# add commands to initialize benchmark: clear cache and logs, warm up cache etc
+composer install --no-dev --classmap-authoritative --ansi
diff --git a/.phpbenchmarks/php/8.0/php.ini b/.phpbenchmarks/php/8.0/php.ini
new file mode 100644
index 0000000..c521d11
--- /dev/null
+++ b/.phpbenchmarks/php/8.0/php.ini
@@ -0,0 +1,31 @@
+; ----------------------------------------------------------------------------------------------------------------------
+; This file will be added to PHP ini files loaded before benchmarking.
+; Configure what you need here.
+;
+; /!\ Do NOT configure opcache.enable: it will be configured automatically.
+; /!\ Do NOT configure opcache.preload and opcache.preload_user: it will be configured automatically. /!\
+; ----------------------------------------------------------------------------------------------------------------------
+
+; Examples of configuration you could change for your needs.
+
+; The maximum number of keys (scripts) in the OPcache hash table.
+; Only numbers between 200 and 1000000 are allowed.
+;opcache.max_accelerated_files=10000
+
+; If disabled, all PHPDoc comments are dropped from the code to reduce the
+; size of the optimized code.
+;opcache.save_comments=1
+
+; A bitmask, where each bit enables or disables the appropriate OPcache
+; passes
+;opcache.optimization_level=0x7FFFBFFF
+
+; Allows exclusion of large files from being cached. By default all files
+; are cached.
+;opcache.max_file_size=0
+
+; Enables or disables opcode caching in shared memory.
+;opcache.file_cache_only=0
+
+; The OPcache shared memory storage size.
+;opcache.memory_consumption=128
diff --git a/.phpbenchmarks/php/8.0/preload.php b/.phpbenchmarks/php/8.0/preload.php
new file mode 100644
index 0000000..1d81ec7
--- /dev/null
+++ b/.phpbenchmarks/php/8.0/preload.php
@@ -0,0 +1,17 @@
+<?php
+
+$sourceCodePath = __DIR__ . '/../../../';
+$files = [
+    "$sourceCodePath/public/index.php",
+    "$sourceCodePath/vendor/autoload.php",
+    "$sourceCodePath/vendor/composer/ClassLoader.php",
+    "$sourceCodePath/vendor/phpbenchmarks/benchmark-json-serialization-hello-world/src/BenchmarkService.php",
+];
+
+foreach ($files as $file) {
+    if (is_readable($file) === false) {
+        throw new \Exception('File "' . $file . '" is not readable.');
+    }
+
+    opcache_compile_file($file);
+}
diff --git a/.phpbenchmarks/php/8.0/responseBody/responseBody.json b/.phpbenchmarks/php/8.0/responseBody/responseBody.json
new file mode 100644
index 0000000..0372188
--- /dev/null
+++ b/.phpbenchmarks/php/8.0/responseBody/responseBody.json
@@ -0,0 +1 @@
+["Hello World !"]
\ No newline at end of file
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..3c76b94
--- /dev/null
+++ b/README.md
@@ -0,0 +1,44 @@
+<p align="center">
+  <img src="http://www.phpbenchmarks.com/images/logo_github.png">
+  <br>
+  <a href="http://www.phpbenchmarks.com" target="_blank">www.phpbenchmarks.com</a>
+</p>
+
+## What is www.phpbenchmarks.com?
+
+You will find a lot of benchmarks for PHP and PHP libraries on [phpbenchmarks.com](http://www.phpbenchmarks.com).
+
+Benchmarks results are available from PHP 5.6 to latest version.
+
+Our benchmarking protocol is available on [benchmarking protocol page](http://www.phpbenchmarks.com/en/documentation/benchmarking-protocol).
+
+## What is this repository?
+
+It contains PHP benchmark code.
+
+Switch branch to select version and benchmark you want to see.
+
+## Benchmarks
+
+You can find PHP 8.0 benchmarks results on
+[benchmarks results page](http://www.phpbenchmarks.com/en/benchmark/php/8.0).
+
+See all PHP benchmarked versions on [select version page](http://www.phpbenchmarks.com/en/benchmark/php/version).
+
+## Community
+
+Go to [community page](http://www.phpbenchmarks.com/en/community) to see the Hall of fame, or download the benchmark kit to add your code!
+
+## How version works?
+
+We do not follow semantic version for this repository.
+
+Here is an explanation about our versioning system:
+
+`X.Y.Z_benchmark-slug_W`
+
+* `X`: PHP major version.
+* `Y`: PHP minor version.
+* `Z`: PHP patch version.
+* `benchmark-slug`: slug of the benchmark, list available on [documentation page](http://www.phpbenchmarks.com/en/documentation).
+* `W`: benchmark version
diff --git a/composer.json b/composer.json
new file mode 100644
index 0000000..eb22e4f
--- /dev/null
+++ b/composer.json
@@ -0,0 +1,10 @@
+{
+    "name": "phpbenchmarks/php",
+    "license": "proprietary",
+    "type": "project",
+    "require": {
+        "php": "8.0.0",
+        "ext-json": "*",
+        "phpbenchmarks/benchmark-json-serialization-hello-world": "1.0.0"
+    }
+}
diff --git a/public/index.php b/public/index.php
new file mode 100644
index 0000000..06ee540
--- /dev/null
+++ b/public/index.php
@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+require __DIR__ . '/../vendor/autoload.php';
+
+use PhpBenchmarks\BenchmarkJsonSerializationHelloWorld\BenchmarkService;
+
+if (BenchmarkService::isWriteToResponseBody()) {
+    echo json_encode(BenchmarkService::getDataToSerialize());
+} else {
+    json_encode(BenchmarkService::getDataToSerialize());
+}