php单线程爬虫类

/**
* @desc：单线程爬虫类
* @author [Lee] <[]>
* @property
* 1、callcontent 获取给定url页面中的内容的回调函数
* 2、calltodo 处理业务逻辑的回调函数 如：把抓取到的内容处理后存到数据库
* @method
* run 执行爬虫程序
*     @param depth 深度 默认2
*     @return void
*/
class crawl{
public $callcontent = 'getcontent';  #  获取给定url页面中的内容的回调函数
public $calltodo = 'todo';  #  处理业务逻辑的回调函数 如：把抓取到的内容处理后存到数据库
private $url;  #  内部属性：当前处理中的url
/*
 @desc：内部方法，调用回调函数获取页面内容
 @param url 传入到回调函数的参数
 @return ret 页面内容
 */
private function getcontent($url){
    $callback = $this->callcontent;
    $ret = call_user_func($callback,$url);
    return $ret;
}
/*
 @desc：内部方法，调用回调函数进行业务处理
 @param content 传入到回调函数的参数
 */
private function todo($content){
    $callback = $this->calltodo;
    call_user_func($callback,$content);
}
/*
 @desc：内部方法，获取页面中的超链接
 @param content 页面内容
 @return urls 获取到的超链接
 */
private function geturl($content){
    $preg = '/<[a|A].*?href=[\'\"]{0,1}([^>\'\"\ ]*).*?>/';
    $bool = preg_match_all($preg,$content,$res);
    $urls = array();
    if($bool){
        $urls = $res[1];
    }
    $urls = array_unique($urls);
    return $urls;
}
/*
 @desc：内部方法，修复不完整的url
 @param url 原始url
 @param url 修复好的url
 */
private function reviseurl($url){
    $info = parse_url($url);
    $scheme = $info["scheme"]?:'http';
    $user = $info["user"];
    $pass = $info["pass"];
    $host = $info["host"];
    $port = $info["port"];
    $path = $info["path"];
    $url = $scheme . '://';
    if ($user && $pass) {
        $url .= $user . ":" . $pass . "@";
    }
    $url .= $host;
    if ($port) {
        $url .= ":" . $port;
    } 
    $url .= $path;
    return $url;
}
/*
 @desc：构造方法，初始化url
 */
public function __construct($url){
    $this->url = $url;
}
/*
 @desc：主方法，执行程序
 @param depth 挖掘深度 默认2
 */
public function run($depth = 2){
    $url = $this->url;
    if($depth > 0){
        $depth--;
        $content = $this->getcontent($url);
        // 业务处理开始
        $this->todo($content);
        // 业务处理结束
        $urls = $this->geturl($content);
        $url = $this->reviseurl($url);
        if (is_array($urls) && !empty($urls)) {
            foreach ($urls as $u) {
                if (preg_match('/^http/', $u)) {
                    $returl = $u;
                } else {
                    $real = $url . '/' . $u;
                    $returl = $real;
                }
                $crawl = new crawl($returl);
                $crawl->run($depth);
            }
        }
    }
}
}

$scrawl = new scrawl('https://blog.51cto.com/12173069');
$scrawl->run(1);
/*
@desc：获取内容的回调
*/
function getcontent($url){
$content = file_get_contents($url);
return $content;
}
/*
@desc：处理业务逻辑的回调
*/
function todo($content){
$preg = '/<[a|A].*?href=[\'\"]{0,1}([^>\'\"\ ]*).*?>/i';
$bool = preg_match_all($preg,$content,$res);
$urls = array();
if($bool){
    $urls = $res[1];
}
$urls = array_unique($urls);
var_dump($urls);
}

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