如何使用php脚本访问嵌套的表单元素

<form method="POST" action="process.php">
  <input type="text" name="name" placeholder="Your Name">
  <input type="text" name="email" placeholder="Your Email">
  <input type="text" name="address[street]" placeholder="Street">
  <input type="text" name="address[city]" placeholder="City">
  <input type="text" name="address[state]" placeholder="State">
  <input type="text" name="address[zip]" placeholder="ZIP Code">
  <input type="submit" value="Submit">
</form>

$name = $_POST['name'];
$email = $_POST['email'];
$street = $_POST['address']['street'];
$city = $_POST['address']['city'];
$state = $_POST['address']['state'];
$zip = $_POST['address']['zip'];