How can I get a PHP value from an HTML form?

Question

I have an HTML form as follows:

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Answer 1

When the form submits, you need to get the values from the $_POST array

You can do print_r($_POST) to see everything it contains (all of the form fields) and reference them individually as well.

Username will be $_POST['username']

I recommend reading a tutorial on working with forms and PHP... here's a good one

Since you're obviously a beginner I'll help you out a bit more:

Give your submit button a name:

Because action is blank, it will POST to the current page. At the top of your file, you can check to see if the form was submitted by checking if $_POST['submit'] is set (I gave your submit button that name).

if(isset($_POST['submit'])) {
    // form submitted, now we can look at the data that came through
    // the value inside the brackets comes from the name attribute of the input field. (just like submit above)
    $username = $_POST['username'];

    // Now you can do whatever with this variable.
}
// close the PHP tag and your HTML will be below