diff --git a/.readthedocs.yml b/.readthedocs.yml
new file mode 100644
index 000000000..55336736c
--- /dev/null
+++ b/.readthedocs.yml
@@ -0,0 +1,31 @@
+# Read the Docs configuration file for Sphinx projects
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+# Required
+version: 2
+
+# Set the OS, Python version and other tools you might need
+build:
+ os: ubuntu-22.04
+ tools:
+ python: "3.11"
+ # You can also specify other tool versions:
+ # nodejs: "19"
+ # rust: "1.64"
+ # golang: "1.19"
+
+# Build documentation in the "docs/" directory with Sphinx
+sphinx:
+ configuration: docs/conf.py
+
+# Optionally build your docs in additional formats such as PDF and ePub
+# formats:
+# - pdf
+# - epub
+
+# Optional but recommended, declare the Python requirements required
+# to build your documentation
+# See https://docs.readthedocs.io/en/stable/guides/reproducible-builds.html
+python:
+ install:
+ - requirements: docs/requirements.txt
diff --git a/docs/Appendix-License.rst b/docs/Appendix-License.rst
new file mode 100644
index 000000000..9755daa25
--- /dev/null
+++ b/docs/Appendix-License.rst
@@ -0,0 +1,443 @@
+*******
+License
+*******
+
+.. code-block:: text
+
+ Copyright (c) 2023 smiley.
+
+ This work is licensed under the Creative Commons
+ Attribution 4.0 International (CC BY 4.0)
+
+ A summary of the license is given below, followed by the full legal
+ text.
+
+ -----------------------------------------------------------------------
+
+ You are free to:
+
+ Share
+
+ - copy and redistribute the material in any medium or format
+
+ Adapt
+
+ - remix, transform, and build upon the material for any purpose,
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+ The licensor cannot revoke these freedoms as long as you follow the
+ license terms.
+
+
+ Under the following terms:
+
+ Attribution
+
+ - You must give appropriate credit, provide a link to the license,
+ and indicate if changes were made.
+
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+ suggests the licensor endorses you or your use.
+
+ No additional restrictions
+
+ - You may not apply legal terms or technological measures that
+ legally restrict others from doing anything the license permits.
+
+ -----------------------------------------------------------------------
+
+ Attribution 4.0 International
+
+ =======================================================================
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diff --git a/docs/Makefile b/docs/Makefile
new file mode 100644
index 000000000..4bbaa7dfe
--- /dev/null
+++ b/docs/Makefile
@@ -0,0 +1,20 @@
+# Minimal makefile for Sphinx documentation
+#
+
+# You can set these variables from the command line, and also
+# from the environment for the first two.
+SPHINXOPTS ?=
+SPHINXBUILD ?= sphinx-build
+SOURCEDIR = .
+BUILDDIR = ../.build/sphinx
+
+# Put it first so that "make" without argument is like "make help".
+help:
+ @$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
+
+.PHONY: help Makefile
+
+# Catch-all target: route all unknown targets to Sphinx using the new
+# "make mode" option. $(O) is meant as a shortcut for $(SPHINXOPTS).
+%: Makefile
+ @$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
diff --git a/docs/Readme.md b/docs/Readme.md
new file mode 100644
index 000000000..f38c79062
--- /dev/null
+++ b/docs/Readme.md
@@ -0,0 +1,65 @@
+# Documentation
+
+## Sources
+
+The markdown sources for the [Read the Docs online manual](https://php-qrcode.readthedocs.io) can of course be browsed on GitHub too!
+
+
+### Usage
+- [Overview](./Usage-Overview.md)
+- [Installation](./Usage-Installation.md)
+- [Quickstart](./Usage-Quickstart.md)
+- [Advanced usage](./Usage-Advanced-usage.md)
+
+### Appendix
+- [License](./Appendix-License.rst)
+
+## Auto generated documentation
+
+### User manual via Sphinx
+
+[](https://php-qrcode.readthedocs.io/en/latest/?badge=latest)
+
+The user manual can be auto generated with [Sphinx](https://www.sphinx-doc.org) from the markdown sources contained in this directory, in order to upload it to [Read the Docs](https://readthedocs.org).
+The online documentation can be found at [php-qrcode.readthedocs.io](https://php-qrcode.readthedocs.io) ([project page](https://readthedocs.org/projects/php-qrcode/))
+
+
+#### Run Sphinx locally
+
+Requirements:
+
+- [Python](https://www.python.org/downloads/) >= v3.10
+ - [Sphinx](https://www.sphinx-doc.org/en/master/usage/installation.html) >= v7.0
+ - [Sphinx RTD theme](https://pypi.org/project/sphinx-rtd-theme/) >= 1.2
+ - [MyST Parser](https://myst-parser.readthedocs.io/en/latest/intro.html) >= 2.0 (see [Sphinx Markdown configuration](https://www.sphinx-doc.org/en/master/usage/markdown.html#markdown))
+
+
+- to install all in one go, run: `pip install sphinx myst-parser sphinx-rtd-theme`
+- run in the `/docs` (this) directory:
+ - on Windows: `.\make.bat html` (make sure `sphinx-build.exe` is in `PATH`)
+ - on Linux: `make html`
+- open [../.build/sphinx/html/index.html](../.build/sphinx/html/index.html) in a browser
+- yay!
+
+
+### API docs via phpDocumentor
+[](https://github.com/chillerlan/php-qrcode/actions/workflows/pages/pages-build-deployment)
+
+The API documentation can be auto generated with [phpDocumentor](https://www.phpdoc.org/).
+There is an [online version available](https://chillerlan.github.io/php-qrcode/) via the [gh-pages branch](https://github.com/chillerlan/php-qrcode/tree/gh-pages) that is [automatically deployed](https://github.com/chillerlan/php-qrcode/deployments) on each push to main.
+
+
+#### Run phpDocumentor locally
+If you'd like to create local docs, please follow these steps:
+
+- [download phpDocumentor](https://github.com/phpDocumentor/phpDocumentor/releases) v3+ as .phar archive
+- run it in the repository root directory:
+ - on Windows `c:\path\to\php.exe c:\path\to\phpDocumentor.phar --config=phpdoc.xml`
+ - on Linux just `php /path/to/phpDocumentor.phar --config=phpdoc.xml`
+- open [../.build/phpdocs/index.html](../.build/phpdocs/index.html) in a browser
+- profit!
+
+
+## License
+
+The documentation is licensed under the [Creative Commons Attribution 4.0 International (CC BY 4.0) License](https://creativecommons.org/licenses/by/4.0/).
diff --git a/docs/Usage-Advanced-usage.md b/docs/Usage-Advanced-usage.md
new file mode 100644
index 000000000..ee5bbc088
--- /dev/null
+++ b/docs/Usage-Advanced-usage.md
@@ -0,0 +1,237 @@
+# Advanced usage
+
+## Configuration via `QROptions`
+
+The [`QROptions`](https://github.com/chillerlan/php-qrcode/blob/main/src/QROptions.php) class is a container based on [chillerlan/php-settings-container](https://github.com/chillerlan/php-settings-container) that behaves similar to a [`\stdClass`](https://www.php.net/manual/class.stdclass) object, but with fixed properties.
+
+```php
+$options = new QROptions;
+
+// set some values
+$options->version = 7; // property "version" exists
+$options->foo = 'bar'; // property "foo" does not exist (and will not be created)
+
+// retrieve values
+var_dump($options->version); // -> 7
+var_dump($options->foo); // -> null (no error will be thrown)
+```
+
+
+### Supply an `iterable` of options
+
+The constructor takes an `iterable` of `$key => $value` pairs. For each setting an optional setter will be called if present.
+
+```php
+$myOptions = [
+ 'version' => 5,
+ 'outputType' => QROutputInterface::GDIMAGE_PNG,
+ 'eccLevel' => EccLevel::M,
+];
+
+$options = new QROptions($myOptions);
+```
+
+You can also set an `iterable` of options on an existing QROptions instance:
+
+```php
+$options->fromIterable($myOptions);
+```
+
+
+### Load and save JSON
+
+The settings can be saved to and loaded from JSON, e.g. to store them in a database:
+
+```php
+$json = $options->toJSON(JSON_THROW_ON_ERROR);
+// via JsonSerializable interface
+$json = json_encode($options, JSON_THROW_ON_ERROR);
+// via __toString()
+$json = (string)$options;
+
+$options = (new QROptions)->fromJSON($json);
+// on an existing instance - properties will be overwriten
+$options->fromJSON($json);
+```
+
+### Extending the `QROptions` class
+
+In case you need additional settings for your output module, just extend `QROptions`...
+
+```php
+class MyCustomOptions extends QROptions{
+ protected string $myParam = 'defaultValue';
+ // ...
+}
+```
+...or use the [`SettingsContainerInterface`](https://github.com/chillerlan/php-settings-container/blob/main/src/SettingsContainerInterface.php), which is the more flexible approach.
+
+```php
+trait MyCustomOptionsTrait{
+ protected string $myParam = 'defaultValue';
+ // ...
+
+ // an optional magic setter, named "set_" + property name
+ protected function set_myParam(string $myParam):void{
+ $this->myParam = trim($myParam);
+ }
+
+ // an optional magic getter, named "get_" + property name
+ protected function get_myParam():string{
+ return strtoupper($this->myParam);
+ }
+}
+
+class MyCustomOptions extends SettingsContainerAbstract{
+ use QROptionsTrait, MyCustomOptionsTrait;
+}
+
+// set the options
+$myCustomOptions = new MyCustomOptions;
+$myCustomOptions->myParam = 'whatever value';
+```
+
+Extend the `SettingsContainerInterface` on-the-fly:
+
+```php
+$myOptions = [
+ 'myParam' => 'whatever value',
+ // ...
+];
+
+$myCustomOptions = new class($myOptions) extends SettingsContainerAbstract{
+ use QROptionsTrait, MyCustomOptionsTrait;
+};
+```
+
+
+## `QRCode` methods
+
+Aside of invoking a `QRCode` instance with an optional `QROptions` object as parameter, you can also set the options instance after invocation.
+After invocation of the `QROptions` instance, values can be set without calling `QRCode::setOptions()` again (instance is backreferenced), however, this may create side effects.
+
+```php
+// instance will be invoked with default settings
+$qrcode = new QRCode;
+
+// set options after QRCode invocation
+$options = new QROptions;
+
+$qrcode->setOptions($options);
+```
+
+
+### Save to file
+
+Save the QR Code output to `/path/to/qrcode.svg`:
+
+```php
+$options->imageBase64 = false;
+$options->cachefile = '/path/to/qrcode.svg';
+
+$qrcode->render($data);
+```
+
+Alternatively, you can specify an output path, which will override the `QROptions::$cachefile` setting:
+
+```php
+$qrcode->render($data, '/other/path/to/qrcode.svg');
+
+printf('', '/other/path/to/qrcode.svg');
+```
+
+
+### Render a `QRMatrix` instance
+
+You can render a [`QRMatrix`](https://github.com/chillerlan/php-qrcode/blob/main/src/Data/QRMatrix.php) instance directly:
+
+```php
+// a matrix from the current data segments
+$matrix = $qrcode->getQRMatrix();
+// from the QR Code reader
+$matrix = $readerResult->getQRMatrix();
+// manually invoked
+$matrix = (new QRMatrix(new Version(7), new EccLevel(EccLevel::M)))->initFunctionalPatterns();
+
+$output = $qrcode->renderMatrix($matrix);
+// save to file
+$qrcode->renderMatrix($matrix, '/path/to/qrcode.svg');
+```
+
+Manual invocation of a `QROutputInterface` to render a `QRMatrix` instance:
+
+```php
+class MyCustomOutput extends QRMarkupSVG{
+ // ...
+}
+
+$qrOutputInterface = new MyCustomOutput($options, $matrix);
+
+$output = $qrOutputInterface->dump()
+// render to file
+$qrOutputInterface->dump('/path/to/qrcode.svg');
+```
+
+
+### Mixed mode
+
+Mixed mode QR Codes can be generated by adding several data segments:
+
+```php
+// make sure to set a proper internal encoding character set
+// ideally, this should be set in php.ini internal_encoding,
+// default_charset or mbstring.internal_encoding
+mb_internal_encoding('UTF-8');
+
+// clear any existing data segments
+$qrcode->clearSegments();
+
+$qrcode
+ ->addNumericSegment($numericData)
+ ->addAlphaNumSegment($alphaNumData)
+ ->addKanjiSegment($kanjiData)
+ ->addHanziSegment($hanziData)
+ ->addByteSegment($binaryData)
+ ->addEciSegment(ECICharset::GB18030, $encodedEciData)
+;
+
+$output = $qrcode->render();
+// render to file
+$qrcode->render(null, '/path/to/qrcode.svg');
+```
+
+The [`QRDataModeInterface`](https://github.com/chillerlan/php-qrcode/blob/main/src/Data/QRDataModeInterface.php) offers the `validateString()` method (implemended for `AlphaNum`, `Byte`, `Hanzi`, `Kanji` and `Number`).
+This method is used internally when a data mode is invoked, but it can come in handy if you need to check input data beforehand.
+
+```php
+if(!Hanzi::validateString($data)){
+ throw new Exception('invalid GB2312 data');
+}
+
+$qrcode->addHanziSegment($data);
+```
+
+
+### QR Code reader
+
+In some cases it might be necessary to increase the contrast of a QR Code image:
+
+```php
+$options->readerUseImagickIfAvailable = true;
+$options->readerIncreaseContrast = true;
+$options->readerGrayscale = true;
+
+$result = (new QRCode($options))->readFromFile('path/to/qrcode.png');
+```
+
+The `QRMatrix` object from the [`DecoderResult`](https://github.com/chillerlan/php-qrcode/blob/main/src/Decoder/DecoderResult.php) can be reused:
+
+```php
+$matrix = $result->getQRMatrix();
+
+// ...matrix modification...
+
+$output = (new QRCode($options))->renderMatrix($matrix);
+
+// ...output
+```
diff --git a/docs/Usage-Installation.md b/docs/Usage-Installation.md
new file mode 100644
index 000000000..dfd54727b
--- /dev/null
+++ b/docs/Usage-Installation.md
@@ -0,0 +1,94 @@
+# Installation
+
+## Installation with Composer
+
+**[Composer](https://getcomposer.org) is required to install this package. Please do not open an issue to complain about "monopolizing the implementation" or similar - we've been there before.**
+
+
+### composer.json
+
+Installation via [`composer.json`](https://getcomposer.org/doc/04-schema.md):
+
+```json
+{
+ "require": {
+ "php": "^7.4",
+ "chillerlan/php-qrcode": "dev-main"
+ }
+}
+```
+
+Note: replace `dev-main` with a [version constraint](https://getcomposer.org/doc/articles/versions.md#writing-version-constraints), e.g. `^4.3` - see [releases](https://github.com/chillerlan/php-qrcode/releases) for valid versions.
+In case you want to keep using `dev-main`, specify the hash of a commit to avoid running into unforseen issues, like so: `dev-main#cb69751c3bc090a7fdd2f2601bbe10f28d225f10`
+
+
+#### Version switch
+
+If your application supports older PHP versions and uses the basic `QRCode` syntax `(new QRCode)->render($data)`, then you can add a version switch to your `composer.json` to allow installing a `php-qrcode` version that suits the platform it runs on:
+
+```json
+{
+ "require": {
+ "php": "^7.0 || ^8.0",
+ "chillerlan/php-qrcode": "^2.0 || ^3.4 || ^4.3 || ^5.0"
+ }
+}
+```
+
+Most of the v2.0 API remains unchanged throughout the several versions up to v5.x, however, please test and verify the expected output before you deploy such a switch.
+
+
+### Terminal
+
+To install `php-qrcode` on the terminal, use:
+
+`composer require chillerlan/php-qrcode`
+
+If you want to install the package from a specific tag or commit, do as follows:
+
+- `composer require chillerlan/php-qrcode:4.3.4`
+- `composer require chillerlan/php-qrcode:dev-main#f15b0afe9d4128bf734c3bf1bcffae72bf7b3e53`
+
+
+## Manual installation
+
+Download the desired version of the package from [main](https://github.com/chillerlan/php-qrcode/archive/refs/heads/main.zip) or
+[release](https://github.com/chillerlan/php-qrcode/releases) and extract the contents to your project folder.
+After that, run `composer install` in the package root directory to install the required dependencies and generate `./vendor/autoload.php`.
+
+Profit!
+
+
+### Can i use this library without using composer?
+
+You can, but it's absolutely not recommended, nor supported.
+
+With that said, I'll leave you with this info:
+
+- download the .zip for a version of your choice and also all required dependencies listed in the `composer.json` for that version (you can find links to the respective repos [on packagist](https://packagist.org/packages/chillerlan/php-qrcode))
+- extract the files into your library folder
+- include the files manually or with whatever autoloader you are using
+
+Good luck!
+
+
+## Supported PHP versions & extension requirements
+
+The PHP built-in extensions [GdImage](https://www.php.net/manual/book.image.php) and [mbstring](https://www.php.net/manual/book.mbstring.php) are used across all versions, [ImageMagick](https://www.php.net/manual/book.imagick.php) is optional since v3.x.
+
+| version | branch/tag | PHP | supported | required extensions | optional extensions | info |
+|---------|----------------------------------------------------------------------|------------------|-----------|---------------------|------------------------------------------------------------------------------------|---------------------------|
+| **v5** | [`dev-main`](https://github.com/chillerlan/php-qrcode/tree/main) | `^7.4 \|\| ^8.0` | yes | `mbstring` | `gd` or `imagick` required for reading QR Codes, `fileinfo` is used in `QRImagick` | |
+| **v4** | [`4.3.4`](https://github.com/chillerlan/php-qrcode/tree/v4.3.x) | `^7.4 \|\| ^8.0` | yes | `gd`, `mbstring` | `imagick` | |
+| **v3** | [`3.4.1`](https://github.com/chillerlan/php-qrcode/tree/v3.2.x) | `^7.2` | no | `gd`, `mbstring` | `imagick` | v3.4.1 also supports PHP8 |
+| **v2** | [`2.0.8`](https://github.com/chillerlan/php-qrcode/tree/v2.0.x) | `>=7.0.3` | no | `gd`, `mbstring` | | |
+| **v1** | [`1.0.9`](https://github.com/chillerlan/php-qrcode/tree/v2.0.x-php5) | `>=5.6` | no | `gd`, `mbstring` | | please let PHP 5 die! |
+
+PSA: [PHP versions < 8.0 are EOL](https://www.php.net/supported-versions.php) and therefore the respective `QRCode` versions are also no longer supported!
+
+
+## ImageMagick
+
+Please follow the installation guides for your operating system:
+- ImageMagick: [imagemagick.org/script/download.php](https://imagemagick.org/script/download.php)
+- PHP `ext-imagick`: [github.com/Imagick/imagick](https://github.com/Imagick/imagick)
diff --git a/docs/Usage-Overview.md b/docs/Usage-Overview.md
new file mode 100644
index 000000000..5c8cea390
--- /dev/null
+++ b/docs/Usage-Overview.md
@@ -0,0 +1,56 @@
+# Overview
+
+## Features
+
+- Creation of [Model 2 QR Codes](https://www.qrcode.com/en/codes/model12.html), [Version 1 to 40](https://www.qrcode.com/en/about/version.html)
+- [ECC Levels](https://www.qrcode.com/en/about/error_correction.html) L/M/Q/H supported
+- Mixed mode support (encoding modes can be combined within a QR symbol). Supported modes:
+ - numeric
+ - alphanumeric
+ - 8-bit binary
+ - 13-bit double-byte kanji (Japanese, Shift-JIS) and hanzi (simplified Chinese, GB2312/GB18030) as [defined in GBT18284-2000](https://www.chinesestandard.net/PDF/English.aspx/GBT18284-2000)
+- Flexible, easily extensible output modules, built-in support for the following output formats:
+ - [GdImage](https://www.php.net/manual/book.image)
+ - [ImageMagick](https://www.php.net/manual/book.imagick)
+ - Markup types: SVG, HTML, etc.
+ - String types: JSON, plain text, etc.
+ - Encapsulated Postscript (EPS)
+ - PDF via [FPDF](https://github.com/setasign/fpdf)
+- QR Code reader (via GD and ImageMagick)
+
+
+## Requirements
+- PHP 7.4+
+ - [`ext-mbstring`](https://www.php.net/manual/book.mbstring.php)
+ - optional:
+ - [`ext-fileinfo`](https://www.php.net/manual/book.fileinfo.php) (required by `QRImagick` output)
+ - [`ext-gd`](https://www.php.net/manual/book.image)
+ - [`ext-imagick`](https://github.com/Imagick/imagick) with [ImageMagick](https://imagemagick.org) installed
+ - [`setasign/fpdf`](https://github.com/setasign/fpdf) for the PDF output module
+
+For the QR Code reader, either `ext-gd` or `ext-imagick` is required!
+
+
+## Framework Integration
+
+- Drupal:
+ - [Two-factor Authentication `tfa`](https://www.drupal.org/project/tfa) (Drupal 8+)
+ - [Google Authenticator Login `ga_login`](https://www.drupal.org/project/ga_login) (deprecated, Drupal 7)
+- Symfony
+ - [phpqrcode-bundle](https://github.com/jonasarts/phpqrcode-bundle)
+- WordPress:
+ - [wp-two-factor-auth](https://github.com/sjinks/wp-two-factor-auth)
+ - [simple-2fa](https://wordpress.org/plugins/simple-2fa/)
+ - [floating-share-button](https://github.com/qriouslad/floating-share-button)
+- WoltLab Suite
+ - [two-step-verification](http://pluginstore.woltlab.com/file/3007-two-step-verification/)
+- other uses:
+ - [dependents](https://github.com/chillerlan/php-qrcode/network/dependents) / [packages](https://github.com/chillerlan/php-qrcode/network/dependents?dependent_type=PACKAGE)
+ - [Appwrite](https://github.com/appwrite/appwrite)
+ - [Cachet](https://github.com/CachetHQ/Cachet)
+ - [GÉANT CAT](https://github.com/GEANT/CAT)
+ - [openITCOCKPIT](https://github.com/it-novum/openITCOCKPIT)
+ - [twill](https://github.com/area17/twill)
+ - [Elefant CMS](https://github.com/jbroadway/elefant)
+- Articles:
+ - [Twilio: How to Create a QR Code in PHP](https://www.twilio.com/blog/create-qr-code-in-php) (featuring v4.3.x)
diff --git a/docs/Usage-Quickstart.md b/docs/Usage-Quickstart.md
new file mode 100644
index 000000000..938aba00d
--- /dev/null
+++ b/docs/Usage-Quickstart.md
@@ -0,0 +1,66 @@
+# Quickstart
+
+## Import the library
+
+Import the main class(es) and include the autoloader (if necessary):
+```php
+use chillerlan\QRCode\{QRCode, QROptions};
+
+require_once __DIR__.'/../vendor/autoload.php';
+```
+
+
+## Create your first QR Code
+
+We want to encode this URI for a mobile authenticator into a QRcode image:
+```php
+$data = 'otpauth://totp/test?secret=B3JX4VCVJDVNXNZ5&issuer=chillerlan.net';
+$qrcode = (new QRCode)->render($data);
+
+printf('', $qrcode);
+```
+
+
+### Configuration
+
+Configuration using `QROptions`:
+
+```php
+$options = new QROptions;
+$options->version = 7;
+$options->imageBase64 = false; // output raw image instead of base64 data URI
+
+header('Content-type: image/svg+xml'); // the image type is SVG by default
+
+echo (new QRCode($options))->render($data);
+```
+
+See [Advanced usage](./Usage-Advanced-usage.md) for a more in-depth usage guide.
+Also, have a look [in the examples folder](https://github.com/chillerlan/php-qrcode/tree/main/examples) for some more usage examples.
+
+
+## Reading QR Codes
+
+Using the built-in QR Code reader is pretty straight-forward:
+```php
+try{
+ $result = (new QRCode)->readFromFile('path/to/file.png'); // -> DecoderResult
+}
+catch(Throwable $exception){
+ // handle exception...
+ // throw ...
+}
+
+// you can now use the result instance...
+$content = $result->data;
+
+// ...or simply cast the result instance to string to get the content
+$content = (string)$result;
+```
+It's generally a good idea to wrap the reading in a try/catch block to handle any errors that may occur in the process.
+
+
+## Notes
+The QR encoder, especially the subroutines for mask pattern testing, can cause high CPU load on increased matrix size.
+You can avoid a part of this load by choosing a fast output module, like SVG.
+Oh hey and don't forget to sanitize any user input!
diff --git a/docs/conf.py b/docs/conf.py
new file mode 100644
index 000000000..4a43a1fe3
--- /dev/null
+++ b/docs/conf.py
@@ -0,0 +1,239 @@
+# -*- coding: utf-8 -*-
+#
+# Configuration file for the Sphinx documentation builder.
+#
+# For the full list of built-in configuration values, see the documentation:
+# https://www.sphinx-doc.org/en/master/usage/configuration.html
+
+# ----------------------------------------------------------------------------
+
+import os
+import platform
+import re
+import shlex
+import sys
+from subprocess import Popen, PIPE
+
+def get_version():
+ if os.environ.get('READTHEDOCS') == 'True':
+ return os.environ.get('READTHEDOCS_VERSION')
+
+ grep = 'git branch | findstr \*' if platform.system() == 'Windows' else 'git branch | grep \*'
+ pipe = Popen(grep, stdout=PIPE, shell=True, universal_newlines=True)
+ version = pipe.stdout.read()
+
+ if version:
+ return version[2:]
+ else:
+ return 'unknown'
+
+# ----------------------------------------------------------------------------
+
+# loading PhpLexer
+from sphinx.highlighting import lexers
+from pygments.lexers.web import PhpLexer
+
+# enable highlighting for PHP code not between ```` by default
+lexers['php'] = PhpLexer(startinline=True)
+lexers['php-annotations'] = PhpLexer(startinline=True)
+
+# -- Project information -----------------------------------------------------
+# https://www.sphinx-doc.org/en/master/usage/configuration.html#project-information
+
+project = u'PHP-QRCode'
+copyright = u'2023, smiley'
+author = u'smiley'
+epub_author = u'smiley'
+
+# The version info for the project you're documenting, acts as replacement for
+# |version| and |release|, also used in various other places throughout the
+# built documents.
+#
+# The short X.Y version.
+version = get_version().strip()
+
+# The full version, including alpha/beta/rc tags.
+release = version
+
+# There are two options for replacing |today|: either, you set today to some
+# non-false value, then it is used:
+#today = ''
+# Else, today_fmt is used as the format for a strftime call.
+#today_fmt = '%B %d, %Y'
+
+# -- General configuration ---------------------------------------------------
+# https://www.sphinx-doc.org/en/master/usage/configuration.html#general-configuration
+
+# If your documentation needs a minimal Sphinx version, state it here.
+needs_sphinx = '5.3.0'
+
+# Add any Sphinx extension module names here, as strings. They can be
+# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
+# ones.
+extensions = [
+ 'myst_parser',
+ 'sphinx.ext.autodoc',
+]
+
+# Add any paths that contain templates here, relative to this directory.
+#templates_path = ['_templates']
+
+# The suffix(es) of source filenames.
+# You can specify multiple suffix as a list of string:
+source_suffix = ['.rst', '.md']
+
+# The encoding of source files.
+#source_encoding = 'utf-8-sig'
+
+# The master toctree document.
+master_doc = 'index'
+
+# The language for content autogenerated by Sphinx. Refer to documentation
+# for a list of supported languages.
+#
+# This is also used if you do content translation via gettext catalogs.
+# Usually you set "language" from the command line for these cases.
+language = 'en'
+
+# List of patterns, relative to source directory, that match files and
+# directories to ignore when looking for source files.
+exclude_patterns = ['_build', 'Readme.md']
+
+# The reST default role (used for this markup: `text`) to use for all
+# documents.
+#default_role = None
+
+# If true, '()' will be appended to :func: etc. cross-reference text.
+#add_function_parentheses = True
+
+# If true, the current module name will be prepended to all description
+# unit titles (such as .. function::).
+#add_module_names = True
+
+# If true, sectionauthor and moduleauthor directives will be shown in the
+# output. They are ignored by default.
+#show_authors = False
+
+# The default language to highlight source code in. The default is 'default'.
+# It is similar to 'python3'; it is mostly a superset of 'python' but it
+# fallbacks to 'none' without warning if failed.
+highlight_language = 'none'
+
+# The name of the Pygments (syntax highlighting) style to use.
+pygments_style = 'sphinx'
+
+# A list of ignored prefixes for module index sorting.
+#modindex_common_prefix = []
+
+# If true, keep warnings as "system message" paragraphs in the built documents.
+#keep_warnings = False
+
+# If true, `todo` and `todoList` produce output, else they produce nothing.
+todo_include_todos = False
+
+
+# -- Options for HTML output -------------------------------------------------
+# https://www.sphinx-doc.org/en/master/usage/configuration.html#options-for-html-output
+
+html_theme = 'sphinx_rtd_theme'
+html_theme_options = {
+ 'collapse_navigation': False,
+ 'display_version': False
+}
+
+html_context = {
+ 'display_github': True,
+ 'github_user': 'chillerlan',
+ 'github_repo': 'php-qrcode',
+ 'github_version': version,
+ 'conf_py_path': '/docs/',
+}
+
+# Add any paths that contain custom themes here, relative to this directory.
+#html_theme_path = ['_templates']
+
+#html_add_permalinks = ''
+
+# The name for this set of Sphinx documents. If None, it defaults to
+# " v documentation".
+html_title = "PHP-QRCode %s Manual" % get_version()
+
+# A shorter title for the navigation bar. Default is the same as html_title.
+#html_short_title = None
+
+# The name of an image file (relative to this directory) to place at the top
+# of the sidebar.
+#html_logo = None
+
+# The name of an image file (within the static path) to use as favicon of the
+# docs. This file should be a Windows icon file (.ico) being 16x16 or 32x32
+# pixels large.
+#html_favicon = None
+
+# Add any paths that contain custom static files (such as style sheets) here,
+# relative to this directory. They are copied after the builtin static files,
+# so a file named "default.css" will overwrite the builtin "default.css".
+#html_static_path = ['_static']
+
+# Add any extra paths that contain custom files (such as robots.txt or
+# .htaccess) here, relative to this directory. These files are copied
+# directly to the root of the documentation.
+#html_extra_path = []
+
+# If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
+# using the given strftime format.
+#html_last_updated_fmt = '%b %d, %Y'
+
+# If true, SmartyPants will be used to convert quotes and dashes to
+# typographically correct entities.
+#html_use_smartypants = True
+
+# Custom sidebar templates, maps document names to template names.
+#html_sidebars = {}
+
+# Additional templates that should be rendered to pages, maps page names to
+# template names.
+#html_additional_pages = {}
+
+# If false, no module index is generated.
+#html_domain_indices = True
+
+# If false, no index is generated.
+#html_use_index = True
+
+# If true, the index is split into individual pages for each letter.
+#html_split_index = False
+
+# If true, links to the reST sources are added to the pages.
+#html_show_sourcelink = True
+
+# If true, "Created using Sphinx" is shown in the HTML footer. Default is True.
+html_show_sphinx = False
+
+# If true, "(C) Copyright ..." is shown in the HTML footer. Default is True.
+#html_show_copyright = True
+
+# If true, an OpenSearch description file will be output, and all pages will
+# contain a tag referring to it. The value of this option must be the
+# base URL from which the finished HTML is served.
+#html_use_opensearch = ''
+
+# This is the file name suffix for HTML files (e.g. ".xhtml").
+#html_file_suffix = None
+
+# Language to be used for generating the HTML full-text search index.
+# Sphinx supports the following languages:
+# 'da', 'de', 'en', 'es', 'fi', 'fr', 'hu', 'it', 'ja'
+# 'nl', 'no', 'pt', 'ro', 'ru', 'sv', 'tr'
+#html_search_language = 'en'
+
+# A dictionary with options for the search language support, empty by default.
+# Now only 'ja' uses this config value
+#html_search_options = {'type': 'default'}
+
+# The name of a javascript file (relative to the configuration directory) that
+# implements a search results scorer. If empty, the default will be used.
+#html_search_scorer = 'scorer.js'
+
+# Output file base name for HTML help builder.
+#htmlhelp_basename = ''
diff --git a/docs/index.rst b/docs/index.rst
new file mode 100644
index 000000000..f7249db54
--- /dev/null
+++ b/docs/index.rst
@@ -0,0 +1,25 @@
+.. php-qrcode documentation master file, created by sphinx-quickstart on Sun Jul 9 21:45:56 2023.
+
+=================
+PHP-QRCode Manual
+=================
+
+Edition for ``chillerlan/php-qrcode`` [|version|]. Updated on |today|.
+
+This work is licensed under the Creative Commons Attribution 4.0 International (CC BY 4.0) License.
+
+.. toctree::
+ :maxdepth: 3
+ :caption: Usage
+
+ Usage-Overview
+ Usage-Installation
+ Usage-Quickstart
+ Usage-Advanced-usage
+
+.. toctree::
+ :maxdepth: 3
+ :caption: Appendix
+
+ Appendix-License
+
diff --git a/docs/make.bat b/docs/make.bat
new file mode 100644
index 000000000..0fc6d0b20
--- /dev/null
+++ b/docs/make.bat
@@ -0,0 +1,36 @@
+@ECHO OFF
+
+pushd %~dp0
+
+REM Command file for Sphinx documentation
+
+if "%SPHINXBUILD%" == "" (
+ set SPHINXBUILD=sphinx-build
+)
+
+set SOURCEDIR=.
+set BUILDDIR=../.build/sphinx
+
+%SPHINXBUILD% >NUL 2>NUL
+if errorlevel 9009 (
+ echo.
+ echo.The 'sphinx-build' command was not found. Make sure you have Sphinx
+ echo.installed, then set the SPHINXBUILD environment variable to point
+ echo.to the full path of the 'sphinx-build' executable. Alternatively you
+ echo.may add the Sphinx directory to PATH.
+ echo.
+ echo.If you don't have Sphinx installed, grab it from
+ echo.https://www.sphinx-doc.org/
+ exit /b 1
+)
+
+if "%1" == "" goto help
+
+%SPHINXBUILD% -M %1 %SOURCEDIR% %BUILDDIR% %SPHINXOPTS% %O%
+goto end
+
+:help
+%SPHINXBUILD% -M help %SOURCEDIR% %BUILDDIR% %SPHINXOPTS% %O%
+
+:end
+popd
diff --git a/docs/requirements.txt b/docs/requirements.txt
new file mode 100644
index 000000000..c13ad56bb
--- /dev/null
+++ b/docs/requirements.txt
@@ -0,0 +1,3 @@
+myst-parser==2.0.0
+Sphinx==7.0.0
+sphinx_rtd_theme==1.2.1