How can PHP be used to extract links from a specific URL, such as index.html?

To extract links from a specific URL like index.html using PHP, you can use the file_get_contents() function to retrieve the contents of the webpage and then use regular expressions or a DOM parser like SimpleXMLElement or DOMDocument to extract the links from the HTML. 

$url = 'http://www.example.com/index.html';
$html = file_get_contents($url);

$doc = new DOMDocument();
$doc->loadHTML($html);

$links = $doc->getElementsByTagName('a');
foreach ($links as $link) {
    echo $link->getAttribute('href') . "\n";
}

Keywords

PHP web scraping DOMDocument file_get_contents regular expressions

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