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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Wandu\Http\Parameters;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Psr\Http\Message\ServerRequestInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Wandu\Http\Contracts\ServerParamsInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class ServerParams extends Parameter implements ServerParamsInterface   | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @reference https://www.sitepoint.com/web-foundations/mime-types-complete-list/  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @reference https://msdn.microsoft.com/ko-kr/library/microsoft.reportingservices.reportrendering.image.mimetype%28v=sql.120%29.aspx  (for IE)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @reference http://sunwebexpert.com/books/detail/php/ie-non-standard-image-mime-type.html (for IE)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var array  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected static $mimeTypes = [  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        'html' => ['text/html', 'application/xhtml+xml'],  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        'txt' => ['text/plain'],  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        'js' => ['application/x-javascript', 'application/javascript', 'application/ecmascript', 'text/javascript', 'text/ecmascript'],  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        'css' => ['application/x-pointplus', 'text/css'],  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        'json' => ['application/json', 'application/x-json'],  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        'xml' => ['text/xml', 'application/xml', 'application/x-xml'],  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        'atom' => ['application/atom+xml'],  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        'rss' => ['application/rss+xml'],  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        'form' => ['application/x-www-form-urlencoded'],  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    ];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /** @var \Psr\Http\Message\ServerRequestInterface */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $request;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param \Psr\Http\Message\ServerRequestInterface $request  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function __construct(ServerRequestInterface $request)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->request = $request;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        parent::__construct($request->getServerParams());  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * {@inheritdoc} | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function isAjax()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->request->hasHeader('x-requested-with') && | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->request->getHeaderLine('x-requested-with') === 'XMLHttpRequest'; | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * {@inheritdoc} | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getIpAddress($customHeaderName = null)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->request->getHeaderLine('x-forwarded-for') ?: $this->get('REMOTE_ADDR'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @reference https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @reference https://developer.mozilla.org/en-US/docs/Web/HTTP/Content_negotiation/List_of_default_Accept_values  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * {@inheritdoc} | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function accepts($contentTypes)  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        if (is_string($contentTypes) && array_key_exists($contentTypes, static::$mimeTypes)) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $contentTypes = static::$mimeTypes[$contentTypes];  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        } elseif (is_string($contentTypes)) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $contentTypes = [$contentTypes];  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $accepts = $this->request->getHeader('accept'); | 
            
            
                                                                        
                            
            
                                    
            
            
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                        if (count($accepts) === 0) return true;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        foreach ($accepts as $accept) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            list($acceptType, $acceptSubType) = $this->splitType($accept);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            if ($acceptType === '*') return true;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            foreach ($contentTypes as $type) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                                if ($type === $accept) return true;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                list($checkType, $checkSubType) = $this->splitType($type);  | 
            
                            
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                                if ($acceptSubType === '*' && $checkType === $acceptType) return true;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        return false;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * {@inheritdoc} | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getLanguages()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return array_map(function ($language) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return strtok($language, ';');  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }, $this->request->getHeader('accept-language')); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $type  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return array  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private function splitType($type)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $acceptTypes = explode('/', strtok($type, ';')); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (!isset($acceptTypes[1])) $acceptTypes[1] = '*';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $acceptTypes;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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This checks looks for assignemnts to variables using the
list(...)function, where not all assigned variables are subsequently used.Consider the following code example.
Only the variables
$aand$care used. There was no need to assign$b.Instead, the list call could have been.