PHP에서 웹페이지의 HTML 콘텐츠를 어떻게 검색할 수 있나요?

<code class="php">$html = file_get_contents('https://stackoverflow.com/questions/ask');</code>

<code class="php">// Initialize cURL
$c = curl_init('https://stackoverflow.com/questions/ask');

// Set options to return the content and handle redirects
curl_setopt($c, CURLOPT_RETURNTRANSFER, true);
curl_setopt($c, CURLOPT_FOLLOWLOCATION, true);

// Execute the request and retrieve the response
$html = curl_exec($c);

// Check if any errors occurred
if (curl_error($c))
    die(curl_error($c));

// Get status code for further processing (if needed)
$status = curl_getinfo($c, CURLINFO_HTTP_CODE);

// Close the cURL connection
curl_close($c);</code>