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Slim

Slim is a PHP micro framework. You quickly write simple yet powerful web applications and APIs. 
 
cd /var/www/html
mkdir composer-slim

composer create-project slim/slim-skeleton:dev-master composer-slim
If PHP extension dom is missing: 
 
sudo php install <span class='keyword_code'>php-xml</span>
sudo php install php-mbstring

composer create-project slim/slim-skeleton:dev-master composer-slim

 
http://localhost/composer-slim/public/index.php

 
// index.php

use Psr\Http\Message\ResponseInterface as Response;
use Psr\Http\Message\ServerRequestInterface as Request;
use Slim\Factory\AppFactory;

require __DIR__ . '/../vendor/autoload.php';

$app = AppFactory::create();

$app->get('/hello/{name}', function (Request $request, Response $response, array $args) {
      $name = $args['name'];
      $response->getBody()->write("Hello, $name");
      return $response;
});

$app->run();
Slim 4 - HttpNotFoundException 
 
use Psr\Http\Message\ResponseInterface as Response;
use Psr\Http\Message\ServerRequestInterface as Request;
use Slim\Factory\AppFactory;

require __DIR__ . '/../vendor/autoload.php';

$app = AppFactory::create();

$app->setBasePath("/composer-slim/public/<span class='keyword_code'>index.php</span>"); // look here

$app->get('/hello/{name}', function (Request $request, Response $response, array $args) {
  $name = $args['name'];
  $response->getBody()->write("Hello, $name");
  return $response;
});

$app->run();

//http://localhost/composer-slim/public/index.php/hello/world

//Shows <span class='keyword_code'>Hello, world</span>
You can build an API using Slim Framework. To consume other API, you can use PHP Curl. 
  copy
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "http://website.com/method");
curl_setopt($ch, CURLOPT_HEADER, 0);            // No header in the result 
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); // Return, do not echo result   

// Fetch and return content, save it.
$raw_data = curl_exec($ch);
curl_close($ch);

// If the API is JSON, use json_decode.
$data = json_decode($raw_data);
var_dump($data);

➥ Questions    
➟
Modern-Php, Autoloader