An extremely simple API (with authentication) example, written in PHP on top of the excellent Slim micro framework. This repo shows the "server", meaning the part that offers the data. There's another repo (https://github.com/panique/simple-php-api-client) showing a "client", meaning the part that GETS the data.
The entire API is inside index.php, but it's using the micro framework Slim and an authentication module. The .htaccess creates these nice-looking URLs like /api/test, that's actually part of Slim.
Put index.php, composer.json and .htaccess from the application folder inside your server. As this API uses "beautiful URLs" (like /api/stuff, not index.php?path=api&...), make sure you have mod_rewrite activated (when using Apache) and set your virtualhost to "AllowOverride All". If you don't know what this means, better use the automatic installation:
For simple setup, this project comes with a full installer which sets up a Ubuntu 14.04 LTS Vagrant box and installs Apache, PHP5, Composer etc. and sets up the application. To do so, go to where the Vagrantfile is and do a "vagrant up" on the console. Your application is then reachable under 192.168.33.44
After installing, check the API which a browser, when using the auto-installer you can do that under http://192.168.33.44/api/test, you'll be asked to enter your login (username: demouser, password: 123) and get back a JSON string. Nice!
For real use, you or somebody else will probably access this API remotely with a client, plase have a look at my other repo https://github.com/panique/simple-php-api-client which shows exactly how to access this API from the outside, also in PHP.
MIT, do whatever you want with it.
The MIT License (MIT)
Copyright (c) 2016 panique
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
I'm also blogging at https://www.dev-metal.com, also find my others repos here: https://github.com/panique !