php新特性之“接口”

最新推荐文章于 2025-08-11 23:47:13 发布

canlynet

最新推荐文章于 2025-08-11 23:47:13 发布

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CC 4.0 BY-SA版权

文章标签： php

本文链接：https://blog.youkuaiyun.com/canlynet/article/details/84896171

本文通过实例演示了PHP中接口的使用方式，并展示了如何利用不同类实现同一个接口来完成文件和网页内容的读取及存储。具体实现了StreamDocument类用于处理文件资源，HtmlDocument类用于获取网页内容，二者都实现了Documentable接口。

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<?php
/**
 * 演示代码：php新特性之“接口”
 */
namespace test;
interface Documentable {
	public function getId();
	public function getContent();
}

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 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 DocumentStore {
	protected $data = [];
	public function addDocument(Documentable $document) {
		$key = $document->getId();
		$value = $document->getContent();
		$this->data[$key] = $value;
	}
	public function getDocuments() {
		return $this->data;
	}
}


function test() {
	$document_store = new \test\DocumentStore();
	$resource = @fopen('test.txt', 'r');
	if (false === $resource) {
		exit('no suche file: test.txt');
	}
	$stream_document = new \test\StreamDocument($resource);
	$document_store->addDocument($stream_document);
	$url = 'http://www.baidu.com';
	$html_document = new \test\HtmlDocument($url);
	$document_store->addDocument($html_document);

	$data = $document_store->getDocuments();

	var_dump($data);
}

test();