How can PHP beginners effectively troubleshoot issues when trying to extract and display specific data from a website?

When trying to extract and display specific data from a website using PHP, beginners can effectively troubleshoot issues by checking the HTML structure of the website to ensure they are targeting the correct elements. They can also use tools like developer consoles to inspect the page and identify the CSS selectors or XPath expressions needed to extract the desired data. Additionally, beginners can use PHP functions like file_get_contents() or cURL to fetch the webpage content before parsing it to extract the specific data.

// Example code to extract and display specific data from a website
$url = 'https://www.example.com';
$html = file_get_contents($url);

// Use DOMDocument to parse the HTML content
$dom = new DOMDocument();
@$dom->loadHTML($html);

// Use DOMXPath to query specific elements based on CSS selectors or XPath expressions
$xpath = new DOMXPath($dom);
$elements = $xpath->query('//div[@class="specific-class"]/p');

// Loop through the elements and display the extracted data
foreach ($elements as $element) {
    echo $element->nodeValue . "<br>";
}