网易公开课批量下载

open-dl.php

#!/usr/bin/env php
<?php

require 'simple_html_dom.php'; // http://sourceforge.net/projects/simplehtmldom/

if (empty($argv[1])) {
    echo 'Give me download url please.', PHP_EOL;
    exit;
}

foreach(find($argv[1]) as list($name, $url)) {
    $fileName = $name . '.mp4';
    if (file_exists($fileName)) {
        continue;
    }
    exec("wget '$url' -O '$name.mp4'");
}

function find($url)
{
    $result = array();
    $dom = file_get_html($url);

    $key = 0;
    foreach ($dom->find('td[class=u-ctitle]') as $td) {
        $name = preg_replace('/\s+/', '', strip_tags($td->outertext));
        $result[$key][0] = iconv('gbk', 'utf-8', $name);
        $key++;
    }

    $key = 0;
    foreach($dom->find('a[class=downbtn]') as $link) {
        $result[$key][1] = $link->href;
        $key++;
    }

    return $result;
}