How to Extract All URLs from a Web Page using PHP

Extract URLs from the website is used in many cases, generating a sitemap from website URL is one of them. You can easily get all URLs from a web page using PHP. Here we’ll provide short and simple code snippets to extract all URLs from a web page in PHP.
The following PHP code helps to get all the links from a web page URL. The file_get_contents() function is used to get webpage content from URL. Fetched web page content is stored in $urlContent variable. All the URLs or links are extracted from web page HTML content using DOMDocument class. All links will validate using FILTER_VALIDATE_URL before return and print if it is a valid URL.

$urlContent = file_get_contents('http://php.net');

$dom = new DOMDocument();
@$dom->loadHTML($urlContent);
$xpath = new DOMXPath($dom);
$hrefs = $xpath->evaluate("/html/body//a");

for($i = 0; $i < $hrefs->length; $i++){
    $href = $hrefs->item($i);
    $url = $href->getAttribute('href');
    $url = filter_var($url, FILTER_SANITIZE_URL);
    // validate url
    if(!filter_var($url, FILTER_VALIDATE_URL) === false){
        echo '<a href="'.$url.'">'.$url.'</a><br />';
    }
}