Form Urlencoded Request Body Parser Middleware

src/Middleware/FormUrlencodedRequestBodyParserMiddleware.php

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+<?php
+
+namespace React\Http\Middleware;
+
+use Psr\Http\Message\ServerRequestInterface;
+
+final class FormUrlencodedRequestBodyParserMiddleware
+{
+    public function __invoke(ServerRequestInterface $request, $next)
+    {
+        $type = $request->getHeaderLine('Content-Type');
+        if ($type !== 'application/x-www-form-urlencoded') {
+            return $next($request);
+        }
+
+        $ret = array();
+        parse_str((string)$request->getBody(), $ret);
+
+        $request = $request->withParsedBody($ret);
+
+        return $next($request);
+    }
+}

tests/Middleware/FormUrlencodedRequestBodyParserMiddlewareTest.php

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+<?php
+
+namespace React\Tests\Http\Middleware;
+
+use Psr\Http\Message\ServerRequestInterface;
+use React\Http\Middleware\FormUrlencodedRequestBodyParserMiddleware;
+use React\Http\ServerRequest;
+use React\Tests\Http\TestCase;
+
+final class FormUrlencodedRequestBodyParserMiddlewareTest extends TestCase
+{
+    public function testFormUrlencodedParsing()
+    {
+        $middleware = new FormUrlencodedRequestBodyParserMiddleware();
+        $request = new ServerRequest(
+            200,
+            'https://example.com/',
+            array(
+                'Content-Type' => 'application/x-www-form-urlencoded',
+            ),
+            'foo=bar&baz[]=cheese&bar[]=beer&bar[]=wine&market[fish]=salmon&market[meat][]=beef&market[meat][]=chicken&market[]=bazaar'
+        );
+
+        /** @var ServerRequestInterface $parsedRequest */
+        $parsedRequest = $middleware(
+            $request,
+            function (ServerRequestInterface $request) {
+                return $request;
+            }
+        );
+
+        $this->assertSame(
+            array(
+                'foo' => 'bar',
+                'baz' => array(
+                    'cheese',
+                ),
+                'bar' => array(
+                    'beer',
+                    'wine',
+                ),
+                'market' => array(
+                    'fish' => 'salmon',
+                    'meat' => array(
+                        'beef',
+                        'chicken',
+                    ),
+                    0 => 'bazaar',
+                ),
+            ),
+            $parsedRequest->getParsedBody()
+        );
+        $this->assertSame('foo=bar&baz[]=cheese&bar[]=beer&bar[]=wine&market[fish]=salmon&market[meat][]=beef&market[meat][]=chicken&market[]=bazaar', (string)$parsedRequest->getBody());
+    }
+}