PHP is a language that is used to create dynamic web pages. Dynamic pages are web pages that can be modified without needing to reload the page. Dynamic pages are used for many purposes including building a shopping cart, a forum, or a blog. Says youtube Seo service in Karachi Upload the PHP file to your host and then in the HTML document that you uploaded, you will have to add PHP and tags. Within the tags, you will have to place the PHP code.