HTML DOM 解析器 - 如何获取论坛中所有主题的第一篇文章

发布于 2024-10-21 09:14:50 字数 902 浏览 8 评论 0原文

我试图废弃 sitepoint javascript 论坛中每个主题的第一篇文章。但是 DOM 解析器会给我 SITE POINT JAVASCRIPT 论坛中每个主题的所有帖子。也许我没有正确遍历 DOM？下面是我的代码：

<?php

class Sitepoint extends Controller
{
    public function index()
    {
        $this->load->helper('dom');
        header('Content-Type: text/html; charset=utf-8');
        echo '<ol>';

            $html = file_get_html('http://www.sitepoint.com/forums/javascript-15');

            foreach($html->find('a[id^="thread_title"]') as $topic) {
                $post =$topic->href;
                $posthtml = file_get_html($post);
                $posthtml->find('div[id^="post_message"]', 0);
                echo'<li>';
                echo $topic->plaintext.'<br>';
                echo $posthtml->plaintext.'<br>';
                echo'</li>';
            }
        echo '</ol>';
    }
}

原文

I was trying to scrap the first post of every topics in sitepoint javascript forum. But The DOM Parser would give me ALL THE POSTS OF EVERY TOPICS IN SITE POINT JAVASCRIPT FORUM. Maybe I didn't traverse the DOM correctly ? Below is my code:

<?php

class Sitepoint extends Controller
{
    public function index()
    {
        $this->load->helper('dom');
        header('Content-Type: text/html; charset=utf-8');
        echo '<ol>';

            $html = file_get_html('http://www.sitepoint.com/forums/javascript-15');

            foreach($html->find('a[id^="thread_title"]') as $topic) {
                $post =$topic->href;
                $posthtml = file_get_html($post);
                $posthtml->find('div[id^="post_message"]', 0);
                echo'<li>';
                echo $topic->plaintext.'<br>';
                echo $posthtml->plaintext.'<br>';
                echo'</li>';
            }
        echo '</ol>';
    }
}

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请你别敷衍 2024-10-28 09:14:50

您忘记将 $posthtml->find 的结果分配给变量：

foreach($html->find('a[id^="thread_title"]') as $topic) {
    $post =$topic->href;
    $posthtml = file_get_html($post);
    $posttext = $posthtml->find('div[id^="post_message_"]', 0);
    echo'<li>';
    echo $topic->plaintext.'<br>';
    echo $posttext->plaintext.'<br>';
    echo'</li>';
}

You forgot to assign the result of $posthtml->find to a variable:

foreach($html->find('a[id^="thread_title"]') as $topic) {
    $post =$topic->href;
    $posthtml = file_get_html($post);
    $posttext = $posthtml->find('div[id^="post_message_"]', 0);
    echo'<li>';
    echo $topic->plaintext.'<br>';
    echo $posttext->plaintext.'<br>';
    echo'</li>';
}

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