Notify Google of sitemap change when any content on website changes

I've used 开发者_运维百科Wordpress's plugin that notifies a few search engines every time you make a new post. However i'm thinking of developing a website that users submit stuff to, how can i use PHP to notify Google with an XML sitemap (or similar method) of the site changes as and when they happen, so users submissions are searchable/indexed quickly by Google.

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To ping Google, the ping url is:

http://www.google.com/webmasters/sitemaps/ping?sitemap=http://www.yoursite.com/sitemap-file.xml

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For PHP:

file_get_contents("https://www.google.com/webmasters/sitemaps/ping?sitemap=https://domain.tld/sitemap.xml")

For Python:

import requests
requests.get("https://www.google.com/webmasters/sitemaps/ping?sitemap=https://domain.tld/sitemap.xml")

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shell_exec('ping -c1 www.google.com/webmasters/sitemaps/ping?sitemap=http://www.website.com/sitemap.php');

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Issue your request to the following URL: www.google.com/webmasters/tools/ping?sitemap=sitemap_url Issue the HTTP request using wget, curl, or another mechanism of your choosing. A successful request will return an HTTP 200 response code, if you receive a different response, you should resubmit your request.