How to access php from html?

I am sorry if this is a repeating question, but I can’t find anyone who might have the same question as me yet. I am new in html and php, and I am trying to learn more by practising, basically creating a registration form and keep all the data in the MySQL database, by using xampp. I have created a registration form and saved it as a .html file format, but how can I use php to send the user input from html to the MySQL database? I have seen a lot of examples on Google, but most of them are using php file format, for example instead of registration.html, they use registration.php. I really do appreciate your help. Thank you very much StackOverflow community members.

P/S: I use Visual Studio Code to do this

Answer

Step 1: write this code in your html file

in form action redirect it to the php file

<!DOCTYPE html>
<html>
<head>
    <title>form</title>
</head>
<body>
    <form method="post" action="st.php">
        <input type="text" name="text">
        <input type="submit" name="submit_btn">
    </form>
</body>
</html>

Step 2 create st.php file and call the action

<?php
    if(isset($_POST['submit_btn'])){
        //your code
       header('Location:yourHTMLFile.html?status=success');//redirect to your html with status
    }
?>

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Answer