Unlike PHP's predecessors, you embed your PHP code inside your HTML as opposed to the other way around. Before PHP, many websites had standard HTML pages for most of their content, linking to Perl CGI pages to do back-end processing when needed. With PHP, all your pages are capable of processing and containing HTML.
Each .php file is processed by PHP that looks for code to execute. PHP considers all the text it finds to be HTML until it finds one of four things:
The first option is the preferred method of entering PHP mode because it is guaranteed to work.
When in PHP mode, you can exit it by using ?> (for <?php and <?); %> for <%) or </script> (for <script language="php">). This code example demonstrates entering and exiting PHP mode:
In HTML mode <?php echo "In PHP mode";
In HTML mode
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