PHP - inherit an Abstract class and a concrete class with override methode

Asked by: melkawakibi

Introduction

I'm working on a project for scanning website on vulnerabilities threats. Therefore I need to program a Spider to index all the pages.

I'm using a combination of two libraries to program the Spider.

1) Symfony\Component\BrowserKit\Client //is a abstract class
2) mmerian\phpcrawl\PHPCrawler //is a concrete class with override function

In order to use them it is required to extends both of them because one is abstract and the other has an override function I need to make it practical.

PHP doesn't allow multiple inheritance, is there a way around this issue?

Spider.php

<?php

namespace App\Core;

use PHPCrawler; //I need to inherit this object
use PHPCrawlerDocumentInfo;

use Symfony\Component\BrowserKit\Client as BaseClient;


class Spider extends BaseClient
{

    private $url;
    private $phpCrawler;

    public function __construct($url){
        parent::__construct();

        //I have instantiated the object instead of inheriting it.
        $this->phpCrawler = new PHPCrawler;

        $this->url = $url;
    }

    public function setup(){

        $this->phpCrawler->setURL($this->url);

        $this->phpCrawler->addContentTypeReceiveRule("#text/html#"); 

        $this->phpCrawler->addURLFilterRule("#\.(jpg|jpeg|gif|png|css)$# i"); 
    }

    public function start(){

        $this->setup();

        echo 'Starting spider' . PHP_EOL;
        $this->phpCrawler->go();

        $report = $this->phpCrawler->getProcessReport();

        echo "Summary:". PHP_EOL; 
        echo "Links followed: ".$report->links_followed . PHP_EOL; 
        echo "Documents received: ".$report->files_received . PHP_EOL; 
        echo "Bytes received: ".$report->bytes_received." bytes". PHP_EOL; 
        echo "Process runtime: ".$report->process_runtime." sec" . PHP_EOL;

        if(!empty($this->phpCrawler->links_found)){
            echo 'not empty';
        }
    }

    //Override - This doesn't work because it is not inherit
    public function handleDocumentInfo(PHPCrawlerDocumentInfo $pageInfo){

        $this->parseHTMLDocument($pageInfo->url, $pageInfo->content);

    }

    public function parseHTMLDocument($url, $content){

        $crawler = $this->request('GET', $url);

        $crawler->filter('a')->each(function (Crawler $node, $i){
            echo $node->attr('href');
        });

    }

    //This is a abstract function
    public function doRequest($request){}

}

Source