Handling HTML Forms with PHP Redux

To ahave one page both display and handle a form, use a conditional.

if (/* form has been submited */) {
// Handle it.
} else {
// Display it.
}

To determine if the form has been submitted, I normally check if the $submit vriable is set (which is the name of the submit input type in the form).

if ( isset($_POST['submit'])) {
// Handle it.
} else {
// Display it.
echo '';
}

If you want a page to handle a form and then display it again use.

if (isset($_POST['submit'])) {
// Handle it.
}
// Display it.

this page both displays and handles a registration form.

register.phps | register.php