There should be no difference whether you use PHP or HTML, however it's important not to use query strings. That is, the search engines do not like example.com/article.php?id=1252. Instead, look to use example.com/article/1252/seo-article-on-file-extension/, or similar to that.

Hypertext Style: Cool URIs don't change. has more info on this - it's recommended for more reasons than just SEO, so why not?

yes there is no major difference between PHP and HTML page SEO are possible in both cases

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I am beginner but I think Its same for HTML and PHP.

HTML is static, PHP is dynamic. PHP allows you to use a database as well as programming in things that will change the page depending on what the user does.

HTML with Javascript can do some dynamic things but is not secure anyone can change the code so it is not good for e commerce or database activities.

An html page has a different extension than a PHP page. so it is considered a different page. If you replace page1.htm with page1.php you will lose the PR and all SEO that you did on the html page. You can use htaccess to get around this though.

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PHP files are just like HTML files, but they can include both HTML and PHP code. The PHP code is parsed (or executed) by the Web server when the page is accessed and the resulting output is written as HTML within the Web page. When a user accesses a PHP page, his Web browser only gets sent the HTML code, since the Web server has processed the PHP code in the background. Most PHP pages are processed so quickly that it does not noticeably slow down the loading of the Web page.

The .php extension is important, since it tells the Web server that the page may include PHP code. Therefore, it must be run through the server's PHP engine before being sent to a client's Web browser. This allows dynamic content to be generated each time the Web page is loaded, based on the variables included in the PHP code. For example, PHP pages may load objects such as the current date and time, data from form fields submitted by a user, or information from a database. Still, once the page reaches the user's Web browser, everything is formatted as HTML.

If you are all .html then you are generic, and generic is never bad.

Set apache to process all files thru php, and make all your files .html

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php doesn't replace html.

The php script is used to output a page of html, some elements of which have been built as a result of programmatic decisions within that script.

The most useful php feature is INCLUDE files. It allows the "page" to be built from chunks of code, and for single chunks to be re-used in multiple pages of the site over and over again.

That allows site-wide changes to be very rapidly implemented. The usage of CSS for styling is crucial. Separation of content and style, once you cross that bridge, opens a whole new way of thinking

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