Does anyone knows here how they did this? http://www.w3schools.com/tags/tryit.asp?filename=tryhtml_button_value2. Unfortunately, it is not part of their tutorial. Sorry for the question , I am just a beginner and I want to understand these things. Thank you.
There are numerous tutorials out there ... This could be as simple as:
<?php if(isset($_GET['subject'])): ?>
<?= 'You chose: ' . $_GET['subject']; ?>
<?php else: ?>
<html>
<body>
<form method="get" action="<?= $_SERVER['PHP_SELF']; ?>">
Choose your favorite subject:
<button type="submit" name="subject" value="fav_HTML">HTML</button>
<button type="submit" name="subject" value="fav_CSS">CSS</button>
</form>
</body>
</html>
<?php endif; ?>