如何在 PHP 中使用網頁抓取來預覽給定的 URL？

Web Scraping in PHP: Previewing a Given URL

Your objective is to extract specific elements from a web page provided by a user using PHP. In this case, you aim to retrieve the page's title, logo image, and a brief text or description.

One recommended approach is utilizing the simple_html_dom library, which simplifies the scraping process. Here's a working example using simple_html_dom:

<code class="php">require 'simple_html_dom.php';

$html = file_get_html('http://www.google.com/');
$title = $html->find('title', 0);
$image = $html->find('img', 0);

echo $title->plaintext."<br>\n";
echo $image->src;</code>

Alternatively, you could accomplish this without an external library, albeit through a less recommended method of using regex on HTML:

<code class="php">$data = file_get_contents('http://www.google.com/');

preg_match('/<title>([^<]+)<\/title>/i', $data, $matches);
$title = $matches[1];

preg_match('/<img[^>]*src=["\']([^\'"]+)["\'][^>]*>/i', $data, $matches);
$img = $matches[1];

echo $title."<br>\n";
echo $img;</code>

These examples demonstrate how to effectively scrape and display the webpage's title and image using simple_html_dom or regex. Note that using regex on HTML is generally discouraged, as it can lead to less robust and reliable results.

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