当$ _GET存在时，PHP变量不会更新

I have a PHP variable that I am trying to be able to update by means of a $_GET request, but the first time the page is loaded, it isn't updated. After the initial page load, if I reload the page again, it is updated. Why won't it work the first time?

PAGE.PHP:

$name = 'Bob';

include('start.php');

echo $name;

START.PHP:

if isset($_GET['name']) {
  $name = $_GET['name'];
}

Example: page.php?name=Mary

Your start file has a syntax error, therefore the code never gets executed.

if (isset($_GET['name'])) {
   ^--------------------^--- missing

e.g.:

php > if isset($foo) { echo 'foo'; }
PHP Parse error:  syntax error, unexpected 'isset' (T_ISSET), expecting '(' in php shell code on line 1
php > if (isset($foo)) { echo 'foo'; }
php >