what is <div> on php?
PHP just passes through HTML like a big echo(), i.e., it ignores it. So...the <div> is just going to be HTML unprocessed by PHP. For examples, you can generate a full template as Vincent Berger has done (these might be sections saved in a database), or send an HTML file having little spots of PHP: https://www.sololearn.com/Discuss/1453627 In either case the HTML is not processed by PHP; it's just echoed text.
The same thing as <div> in Html