PHP Superglobals: $_GET, $_POST, $_SERVER

Superglobals are built-in arrays always available in PHP.

$_GET example

URL:
page.php?name=Alex

echo $_GET['name'];

$_POST example

HTML form:

<form method="post">
  <input name="email">
  <button>Send</button>
</form>

PHP:

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
  echo $_POST['email'];
}

$_SERVER

echo $_SERVER['REQUEST_URI'];

Next: Handling forms safely.