How to colect data from forms.

Answer 1

if you passed data through GET METHOD you can get the data $_GET['NAME_OF_INPUT'] else if METHOD IS POST $_POST['NAME_OF_INPUT']

Answer 2

1st step create a name tag in input field
e.g <input type="text" name="username" />

2nd step create an attribute method="POST" or method ="GET" in form element

3rd step create an attribute action="action.php" in form element

4th step declare a variable in action.php to store value $_POST["username"] and insert to database