NVDownloader.php

<?php

/**
 * Created by PhpStorm.
 * User: niceforbear
 * Date: 15/12/16
 * Time: 下午11:11
 */

/*
 * Step 1:
 * You could use this class to fetch Netease Open Class(http://open.163.com), you could get a clear
 * array which include these class orders, names and their links.
 *
 * Document of phpquery: http://code.google.com/p/phpquery/
 */
class NVDownloader
{
    const DECIDE_CODE = 1023; # Just for debug;

    private $downloadUrl = 'default'; # The url page which is parsing and downloading.

    private $loop = 50; # For pretty loop printing

    private $charset = 'utf-8'; # charset of Chinese

    private $content = []; # content array, which include two section: its name and download link.

    public function __construct($downloadUrl = '')
    {
        try {
            if (empty($downloadUrl)) {
                throw new Exception('The download url can\'t be empty.');
            } else {
                include('phpquery-master/phpQuery/phpQuery.php');
                $this->downloadUrl = $downloadUrl;
            }
        } catch (Exception $e) {
            print $e->getMessage();
            exit;
        }
    }

    public function finish()
    {
        phpQuery::newDocumentFileHTML($this->downloadUrl, $this->charset);
        $nodeCount = pq("#list2")->count();
        $articleList = pq("#list2 tr");

        echo "Start\n";
        for ($i = 0; $i < $this->loop; $i++) {
            echo '=';
        }
        echo "\n";

        $i = 0;
        foreach ($articleList as $tr) {
            $i++;
            if ($i <= 1) { # Filter the first node which has no meaning.
                continue;
            }
            $className = $tr->nodeValue; # This class order and its name.
            $classNameCombine = explode(' ', $className);
            $j = 0;
            $this->content[$i-1]['chapterName'] = '';
            foreach ($classNameCombine as $k => $v) { # Put all class order and its name into $this->content array.
                $v = trim($v);
                if (empty($v)) {
                    continue;
                }
                $j++;
                if ($j == 1) {
                    $this->content[$i-1]['chapterId'] = $v;
                } else {
                    $this->content[$i-1]['chapterName'] .= $v . " ";
                }
            }
            $child = pq("td", $tr)->html();
            $trueContent = explode(' ', $child);
            $linkString = '';
            foreach ($trueContent as $k => $v) {
                $v = trim($v);

                if (empty($v)) {
                    continue;
                }

                if ($v == "<a") {
                    $linkString = $v . ' ' . $trueContent[$k+1];
                    break;
                }
            }
            $urls = explode("\"", $linkString);
            $this->content[$i-1]['link'] = $urls[1];
//            $name = explode("<", $urls[2]);
//            $name = substr($name[0], 1);
//            $this->content[$i-1]['name'] = $name;
        }

        var_dump($this->content);

        for ($i = 0; $i < $this->loop; $i++) {
            echo '=';
        }
        echo "\nFinished! \n";
    }

    private function curl($item)
    {
    }
}

/**
 * Demo usage
 */
if (!empty($argv)) {
    if ($argv[1] == NVDownloader::DECIDE_CODE) {
        $url = empty($argv[2]) ? 'http://open.163.com/special/opencourse/algorithms.html': $argv[2];
        $oy = new NVDownloader($url);
        $oy->finish();
    } else {
        echo "\nwrong\n";
    }
} else {
    echo "\nYou should type arg 1023 to get demo output. ^_^\n";
}