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                <?php declare(strict_types = 1);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace JSKOS;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Psr\Http\Message\RequestInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Psr\Http\Message\ResponseInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Http\Message\ResponseFactory;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Http\Discovery\MessageFactoryDiscovery;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                use Psr\Log\LoggerInterface;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                use Psr\Log\NullLogger;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                        
                            
            
                                    
            
            
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                 * A JSKOS Server.  | 
            
            
                                                                        
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                class Server implements \Psr\Log\LoggerAwareInterface  | 
            
            
                                                                        
                            
            
                                    
            
            
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                { | 
            
            
                                                                        
                            
            
                                    
            
            
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                    protected $service;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    protected $logger;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function __construct(  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        Service $service,   | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        ResponseFactory $responseFactory=null,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        LoggerInterface $logger=null   | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    )  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->service = $service;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->responseFactory = $responseFactory ?: MessageFactoryDiscovery::find();  | 
            
                            
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                        $this->logger = $logger ?: new NullLogger();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function setLogger(LoggerInterface $logger)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->logger = $logger;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function parseRequest(RequestInterface $request): array  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $uri = $request->getUri();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $path = $uri->getPath();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $query = [];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        parse_str($uri->getQuery(), $query);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $callback = null;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (isset($query['callback'])) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            if (preg_match('/^[$A-Z_][0-9A-Z_$.]*$/i', $query['callback'])) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $callback = $query['callback'];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            unset($query['callback']);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        # TODO: get language parameter from headers  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return [$query, $path, $callback];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function query(RequestInterface $request): ResponseInterface  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    {     | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $method = $request->getMethod();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $result = null;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $callback = null;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($method == 'GET' or $method == 'HEAD') { | 
            
                            
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                            list ($query, $path, $callback) = $this->parseRequest($request);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            # TODO: detect conflicting parameters?  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            # if (isset($params['uri']) and isset($params['search'])) { | 
            
                            
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                            #   $error = new Error(422, 'request_error', 'Conflicting request parameters uri & search');  | 
            
                            
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                            # }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            try { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $result = $this->service->query($query, $path);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            } catch(Error $e) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $error = $e;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            # TODO: catch other kinds of errors:  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            # } catch (\Exception $e) { | 
            
                            
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                            # $this->logger->error('Service Exception', ['exception' => $e]); | 
            
                            
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                            # $error = new Error(500, 'Internal server error');  | 
            
                            
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                        } elseif ($request->getMethod() == 'OPTIONS') {             | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return $this->optionsResponse();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        } else { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $error = new Error(405, 'Method not allowed');  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($result) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $code = 200;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $headers = [  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'Access-Control-Allow-Origin' => '*',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'Content-Type' => 'application/json; charset=UTF-8',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'X-Total-Count' => $result->getTotalCount()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $body = $result->json();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        } else { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $code = $error->code;  | 
            
                            
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                            $headers = [  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'Access-Control-Allow-Origin' => '*',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'Content-Type' => 'application/json; charset=UTF-8',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $body = $error->json();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $headers['Content-Length'] = strlen($body);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($method == 'HEAD') { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $body = '';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($callback) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $body = "/**/$callback($body);";  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $headers['Content-Type'] = 'application/javascript; charset=UTF-8';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->responseFactory->createResponse($code, null, $headers, $body);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function optionsResponse()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $headers = [  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'Access-Control-Allow-Methods' => 'GET, HEAD, OPTIONS',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        ];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        # TODO:  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        # if (isset($_SERVER['HTTP_ACCESS_CONTROL_REQUEST_METHOD']) &&  | 
            
                            
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                        #    $_SERVER['HTTP_ACCESS_CONTROL_REQUEST_METHOD'] == 'GET') { | 
            
                            
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                        #    $response->headers['Access-Control-Allow-Origin'] = '*';  | 
            
                            
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                     | 
                     | 
                    
                                                                                                    
                        
                         
                                                                                        
                                                                                     
                     | 
                
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    128
                 | 
                                    
                                                     | 
                
                 | 
                        #    $response->headers['Acess-Control-Expose-Headers'] = 'Link, X-Total-Count';  | 
            
                            
                    | 
                        
                     | 
                     | 
                     | 
                    
                                                                                                    
                        
                         
                                                                                        
                                                                                     
                     | 
                
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    129
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    130
                 | 
                                    
                                                     | 
                
                 | 
                        return $this->responseFactory->createResponse(200, null, $headers, '');  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    131
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    132
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    133
                 | 
                                    
                                                     | 
                
                 | 
                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    134
                 | 
                                    
                                                     | 
                
                 | 
                     * TODO: Extract requested languages(s) from request.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    135
                 | 
                                    
                                                     | 
                
                 | 
                    public function extractRequestLanguage($params)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    136
                 | 
                                    
                                                     | 
                
                 | 
                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    137
                 | 
                                    
                                                     | 
                
                 | 
                        $language = null;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    138
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    139
                 | 
                                    
                                                     | 
                
                 | 
                        # get query modifier: language  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    140
                 | 
                                    
                                                     | 
                
                 | 
                        if (isset($params['language'])) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    141
                 | 
                                    
                                                     | 
                
                 | 
                            $language = $params['language'];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    142
                 | 
                                    
                                                     | 
                
                 | 
                            unset($params['language']);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    143
                 | 
                                    
                                                     | 
                
                 | 
                            # TODO: parse language  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    144
                 | 
                                    
                                                     | 
                
                 | 
                        } elseif (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    145
                 | 
                                    
                                                     | 
                
                 | 
                            # parse accept-language-header  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    146
                 | 
                                    
                                                     | 
                
                 | 
                            preg_match_all(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    147
                 | 
                                    
                                                     | 
                
                 | 
                                '/([a-z]+(?:-[a-z]+)?)\s*(?:;\s*q\s*=\s*(1|0?\.[0-9]+))?/i',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    148
                 | 
                                    
                                                     | 
                
                 | 
                                $_SERVER['HTTP_ACCEPT_LANGUAGE'],  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    149
                 | 
                                    
                                                     | 
                
                 | 
                                $match);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    150
                 | 
                                    
                                                     | 
                
                 | 
                            if (count($match[1])) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    151
                 | 
                                    
                                                     | 
                
                 | 
                                foreach ($match[1] as $i => $l) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    152
                 | 
                                    
                                                     | 
                
                 | 
                                    if (isset($match[2][$i]) && $match[2][$i] != '') { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    153
                 | 
                                    
                                                     | 
                
                 | 
                                        $langs[strtolower($l)] = (float) $match[2][$i];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    154
                 | 
                                    
                                                     | 
                
                 | 
                                    } else { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    155
                 | 
                                    
                                                     | 
                
                 | 
                                        $langs[strtolower($l)] = 1;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    156
                 | 
                                    
                                                     | 
                
                 | 
                                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    157
                 | 
                                    
                                                     | 
                
                 | 
                                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    158
                 | 
                                    
                                                     | 
                
                 | 
                                arsort($langs, SORT_NUMERIC);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    159
                 | 
                                    
                                                     | 
                
                 | 
                                reset($langs);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    160
                 | 
                                    
                                                     | 
                
                 | 
                                $language = key($langs); # most wanted language  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    161
                 | 
                                    
                                                     | 
                
                 | 
                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    162
                 | 
                                    
                                                     | 
                
                 | 
                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    163
                 | 
                                    
                                                     | 
                
                 | 
                          | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    164
                 | 
                                    
                                                     | 
                
                 | 
                        return $language;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    165
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    166
                 | 
                                    
                                                     | 
                
                 | 
                */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    167
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    168
                 | 
                                    
                                                     | 
                
                 | 
                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    169
                 | 
                                    
                                                     | 
                
                 | 
                	 * Utility function to emit a Response without additional framework.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    170
                 | 
                                    
                                                     | 
                
                 | 
                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    171
                 | 
                                    
                                                     | 
                
                 | 
                    public static function sendResponse(ResponseInterface $response)   | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    172
                 | 
                                    
                                                     | 
                
                 | 
                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    173
                 | 
                                    
                                                     | 
                
                 | 
                		$code = $response->getStatusCode();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    174
                 | 
                                    
                                                     | 
                
                 | 
                		$reason = $response->getReasonPhrase();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    175
                 | 
                                    
                                                     | 
                
                 | 
                		header(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    176
                 | 
                                    
                                                     | 
                
                 | 
                			sprintf('HTTP/%s %s %s', $response->getProtocolVersion(), $code, $reason), | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    177
                 | 
                                    
                                                     | 
                
                 | 
                			true, $code   | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    178
                 | 
                                    
                                                     | 
                
                 | 
                		);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    179
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    180
                 | 
                                    
                                                     | 
                
                 | 
                		foreach ($response->getHeaders() as $header => $values) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    181
                 | 
                                    
                                                     | 
                
                 | 
                			foreach ($values as $value) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    182
                 | 
                                    
                                                     | 
                
                 | 
                				header("$header: $value", false); | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    183
                 | 
                                    
                                                     | 
                
                 | 
                			}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    184
                 | 
                                    
                                                     | 
                
                 | 
                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    185
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    186
                 | 
                                    
                                                     | 
                
                 | 
                		echo $response->getBody();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    187
                 | 
                                    
                                                     | 
                
                 | 
                	}  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
                | 
                    188
                 | 
                                    
                                                     | 
                
                 | 
                }  | 
            
            
                                                        
            
                                    
            
            
                | 
                    189
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                        
In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: