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+# MaxMind DB Reader PHP API #
+
+## Description ##
+
+This is the PHP API for reading MaxMind DB files. MaxMind DB is a binary file
+format that stores data indexed by IP address subnets (IPv4 or IPv6).
+
+## Installation (Composer) ##
+
+We recommend installing this package with [Composer](https://getcomposer.org/).
+
+### Download Composer ###
+
+To download Composer, run in the root directory of your project:
+
+```bash
+curl -sS https://getcomposer.org/installer | php
+```
+
+You should now have the file `composer.phar` in your project directory.
+
+### Install Dependencies ###
+
+Run in your project root:
+
+```
+php composer.phar require maxmind-db/reader:~1.0
+```
+
+You should now have the files `composer.json` and `composer.lock` as well as
+the directory `vendor` in your project directory. If you use a version control
+system, `composer.json` should be added to it.
+
+### Require Autoloader ###
+
+After installing the dependencies, you need to require the Composer autoloader
+from your code:
+
+```php
+require 'vendor/autoload.php';
+```
+
+## Installation (Standalone) ##
+
+If you don't want to use Composer for some reason, a custom
+`autoload.php` is provided for you in the project root. To use the
+library, simply include that file,
+
+```php
+require('/path/to/MaxMind-DB-Reader-php/autoload.php');
+```
+
+and then instantiate the reader class normally:
+
+```php
+use MaxMind\Db\Reader;
+$reader = new Reader('example.mmdb');
+```
+
+## Installation (RPM)
+
+RPMs are available in the [official Fedora repository](https://apps.fedoraproject.org/packages/php-maxminddb).
+
+To install on Fedora, run:
+
+```bash
+dnf install php-maxminddb
+```
+
+To install on CentOS or RHEL 7, first [enable the EPEL repository](https://fedoraproject.org/wiki/EPEL)
+and then run:
+
+```bash
+yum install php-maxminddb
+```
+
+Please note that these packages are *not* maintained by MaxMind.
+
+## Usage ##
+
+## Example ##
+
+```php
+<?php
+require_once 'vendor/autoload.php';
+
+use MaxMind\Db\Reader;
+
+$ipAddress = '24.24.24.24';
+$databaseFile = 'GeoIP2-City.mmdb';
+
+$reader = new Reader($databaseFile);
+
+// get returns just the record for the IP address
+print_r($reader->get($ipAddress));
+
+// getWithPrefixLen returns an array containing the record and the
+// associated prefix length for that record.
+print_r($reader->getWithPrefixLen($ipAddress));
+
+$reader->close();
+```
+
+## Optional PHP C Extension ##
+
+MaxMind provides an optional C extension that is a drop-in replacement for
+`MaxMind\Db\Reader`. In order to use this extension, you must install the
+Reader API as described above and install the extension as described below. If
+you are using an autoloader, no changes to your code should be necessary.
+
+### Installing Extension ###
+
+First install [libmaxminddb](https://github.com/maxmind/libmaxminddb) as
+described in its [README.md
+file](https://github.com/maxmind/libmaxminddb/blob/main/README.md#installing-from-a-tarball).
+After successfully installing libmaxmindb, you may install the extension
+from [pecl](https://pecl.php.net/package/maxminddb):
+
+```
+pecl install maxminddb
+```
+
+Alternatively, you may install it from the source. To do so, run the following
+commands from the top-level directory of this distribution:
+
+```
+cd ext
+phpize
+./configure
+make
+make test
+sudo make install
+```
+
+You then must load your extension. The recommend method is to add the
+following to your `php.ini` file:
+
+```
+extension=maxminddb.so
+```
+
+Note: You may need to install the PHP development package on your OS such as
+php5-dev for Debian-based systems or php-devel for RedHat/Fedora-based ones.
+
+## 128-bit Integer Support ##
+
+The MaxMind DB format includes 128-bit unsigned integer as a type. Although
+no MaxMind-distributed database currently makes use of this type, both the
+pure PHP reader and the C extension support this type. The pure PHP reader
+requires gmp or bcmath to read databases with 128-bit unsigned integers.
+
+The integer is currently returned as a hexadecimal string (prefixed with "0x")
+by the C extension and a decimal string (no prefix) by the pure PHP reader.
+Any change to make the reader implementations always return either a
+hexadecimal or decimal representation of the integer will NOT be considered a
+breaking change.
+
+## Support ##
+
+Please report all issues with this code using the [GitHub issue tracker](https://github.com/maxmind/MaxMind-DB-Reader-php/issues).
+
+If you are having an issue with a MaxMind service that is not specific to the
+client API, please see [our support page](https://www.maxmind.com/en/support).
+
+## Requirements  ##
+
+This library requires PHP 7.2 or greater.
+
+The GMP or BCMath extension may be required to read some databases
+using the pure PHP API.
+
+## Contributing ##
+
+Patches and pull requests are encouraged. All code should follow the PSR-1 and
+PSR-2 style guidelines. Please include unit tests whenever possible.
+
+## Versioning ##
+
+The MaxMind DB Reader PHP API uses [Semantic Versioning](https://semver.org/).
+
+## Copyright and License ##
+
+This software is Copyright (c) 2014-2020 by MaxMind, Inc.
+
+This is free software, licensed under the Apache License, Version 2.0.