PHP interface（介面）的範例程式碼

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<?phpclass DocumentStore{    protected $data = [];        public function addDocument(Documentable $document)    {        $key = $document->getId();        $value = $document->getContent();        $this->data[$key] = $value;    }        public function getDocuments()    {        return $this->data;    }        }interface Documentable{    public function getId();        public function getContent();}class HtmlDocument implements Documentable{    protected $url;        public function __construct($url)    {        $this->url = $url;    }        public function getId()    {        return $this->url;    }        public function getContent()    {        $ch = curl_init();        curl_setopt($ch, CURLOPT_URL, $this->url);        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 3);        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);        curl_setopt($ch, CURLOPT_MAXREDIRS, 3);        $html = curl_exec($ch);        curl_close($ch);                return $html;    }}class StreamDocument implements Documentable{    protected $resource;    protected $buffer;        public function __construct($resource, $buffer = 4096)    {        $this->resource = $resource;        $this->buffer = $buffer;    }        public function getId()    {        return ‘resource-‘ . (int)$this->resource;    }        public function getContent()    {        $streamContent = ‘‘;        rewind($this->resource);        while (feof($this->resource) === false){            $streamContent .= fread($this->resource, $this->buffer);        }                return $streamContent;    }}class CommandOutputDocument implements Documentable{    protected $command;        public function __construct($command)    {        $this->command = $command;    }        public function getId()    {        return $this->command;    }        public function getContent()    {        return shell_exec($this->command);    }}$documentStore = new DocumentStore();//添加HTML文檔$htmlDoc = new HtmlDocument(‘https://php.net‘);$documentStore->addDocument($htmlDoc);//添加流文檔$streamDoc = new StreamDocument(fopen(‘stream.txt‘, ‘rb‘));$documentStore->addDocument($streamDoc);//添加終端命令文檔$cmdDoc = new CommandOutputDocument(‘cat /etc/hosts‘);$documentStore->addDocument($cmdDoc);print_r($documentStore->getDocuments());

 

PHP interface（介面）的範例程式碼