get html of a web page.....Very urgent...

Quick practical summary for @ditty: the simplest manual route is the browser "Save Page As" that @anshu.khadka mentioned, and @cwarn23 correctly pointed out file_get_contents() for quick GETs. For anything that must run reliably on a server (timeouts, redirects, headers, cookies, SSL) prefer the cURL extension or an HTTP client library. file_get_contents() works for trivial cases but can be disabled by allow_url_fopen and gives little control or error reporting.

A robust minimal cURL pattern (GET, follow redirects, timeout, gzip support, basic error check):

<?php
$url = 'https://example.com/';
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_TIMEOUT, 10);
curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (compatible; PHP script)');
curl_setopt($ch, CURLOPT_ENCODING, ''); // accept gzip/deflate
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, true);
$html = curl_exec($ch);
$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
if ($html === false) {
    $err = curl_error($ch);
    // handle/report error
}
curl_close($ch);

For extracting data from the returned HTML, use DOM parsing (DOMDocument + DOMXPath) rather than regex. Example pattern:

<?php
libxml_use_internal_errors(true);
$dom = new DOMDocument();
$dom->loadHTML($html);
$xpath = new DOMXPath($dom);
$title = trim($xpath->evaluate('string(//title)'));

Troubleshooting and practical notes: check that the PHP cURL extension is installed and that allow_url_fopen/open_basedir settings are not blocking access. Server-side fetches do not run JavaScript—sites that require rendering need a headless browser (Puppeteer/Playwright) or a rendering service. Always handle HTTP status codes, follow robots.txt and site terms, throttle requests and cache responses to avoid bans. For larger projects, consider a higher-level client such as Guzzle for retries, middleware, and cleaner code.