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Whether the tag you submitted is a tag, you need to use <input type="submit" value="submit"> to submit

There is also <form actioh="the php file to be submitted. Name.php" method="post"> The form tag submission address must also be written correctly. Write it as the php file you want to submit, and then the .php file receives the data

You just right-click and open it with the browser - -

You need to use the port and protocol to run the program