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POHow does PHP interact with HTML and vice versa?
 

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  1. POHow does PHP interact with HTML and vice versa?
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    <p>I'm learning how the internet and websites work. I think I understand how .php files get processed by the PHP processor:</p> <p>Browser requests webpage ending in .php and sends request to server for that webpage.<br> Server asks 'can I find that page?'<br> If server does not find it, server sends back error.<br> If server finds page, server asks 'does file extension end in .html or .php'?<br> If it ends in .html, server send page back to browser.<br> If it ends in .php, hand page to PHP processor.<br> PHP processor scans the page, line by line. It build a processed HTML page.<br> If it finds HTML, it passes that on as part of the processed HTML page it is building.<br> If it finds PHP scripts, the PHP processor may or may not output HTML.<br> When the PHP processor is done, the processed page is handed to the web server for sending to the browser.</p> <p>Does HTML still provide structure to a .php file, the same way HTML provides structure to a webpage that also uses CSS? When I say structure I mean divisions, and head and body sections. Structure as in the bare bones skeleton of the webpage. It seems that on some web pages, there's more PHP than there is HTML. Sometimes there's the bare minimum HTML, and the rest is PHP and Javascript, is this the way webpages were made to be?</p> <p>In summary, a web page that has PHP code in it needs be have a .php extension. Once the PHP processor encounters <code>&lt;? PHP</code> or <code>&lt;?</code>, the server sends the code to the PHP processor (this wording is probably redundant). The output of the PHP processor can be anything. <br> Anything includes: <ul> <li>Css</li> <li>HTML</li> <li>Javascript?</li> <li>XML?</li> <li>XHTML?</li> <li>Images</li> <li>Sound?</li> <li>Video?</li> <li>Animations such as flash?</li> </ul> <br> Apparently forcing content type may be needed, but it can be done.<br> HTML is WYSIWYG. <br> To control and manipulate a web page after it has reached the user's browser, Javascript can be used. With the advent of mobile devices and a few different types of browsers, jQuery was invented to make the developing Javascript programs easier.<br></p>
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    1. COPHP is not an alternative to HTML. If you want to represent web-pages, you need to use HTML markup. PHP is merely a programming language which is (in this context) used to dynamically generate HTML markup. So, if you request a PHP file, and expect a web-page in return, the PHP script has to generate the HTML markup and send it in the response. You can put HTML markup directly into the PHP file, and you can also use templating engines (or manual techniques) to generate the HTML markup based on data from a database.
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    2. COIn short, HTML is an output, PHP is just a tool to create it.
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