Tags in programming languages are strings added to the source code for identification. Most languages treat tags as identifiers, followed by a colon for identification.
##In PHP we use Exit PHP mode. Most embedded scripting languages are embedded in HTML in this mode, such as CSS, ASP, JSP, JS, etc. You can turn PHP mode on or off in the HTML file like this according to your needs. When PHP parses a file, it will look for start and end flags to tell PHP to start and stop interpreting the code in it. When PHP encounters the end mark, it will simply output the following content as is, so any number of PHP tags can be embedded in an HTML document.Note:
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