从每个 tr 的第一个 td 检索数据 [英] Retrieve data from the first td in every tr

问题描述

我正在抓取一个页面，其中包含一个带有多个 tr 的表格.在每个 tr 中有四个 td，我想从这些 td 中的第一个获取数据.下面是我到目前为止尝试过的代码，但它抓住了所有的 td.我怎样才能完成我想要的?

I'm scraping a page which contains of a table with several tr's. Inside every tr there's four td's, and I want to get the data from the first of these td's. Below is the code I've tried so far, but it grabs all the td's. How can I accomplish what I want?

...
$html = new simple_html_dom();
$html = file_get_html($url);

foreach($html->find('table tr') as $row) {
    foreach($row->find('td', 0) as $cell) {
        echo $cell;
    }
}

推荐答案

想想为什么要使用第二个 foreach，而实际上你只想对每个 行中的一个元素进行操作.

Think about why you're using the second foreach when you actually only mean to act on one element within each row.

$html = new simple_html_dom();
$html = file_get_html($url);

foreach($html->find('table tr') as $row) {
    $cell = $row->find('td', 0);
    echo $cell;
}

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