为什么我的Google OAuth 2.0不起作用？

I've been working on a small script to grab YouTube channel data and my Google OAuth 2.0 isn't working.

$validate = "https://accounts.google.com/o/oauth2/auth?client_id=242340718758-65veqhhdjfl21qc2klkfhbcb19rre8li.apps.googleusercontent.com&redirect_uri=http://conor1998.web44.net/php/oauth.php&scope=https://www.googleapis.com/auth/yt-analytics.readonly&response_type=code&access_type=offline";

echo "<a href='$validate'>Login with Google for advanced analytics</a>";

if(isset($_GET['code'])) {
    // try to get an access token
    $code = $_GET['code'];
    $url = 'https://accounts.google.com/o/oauth2/token?code='.$code.'&client_id=242340718758-65veqhhdjfl21qc2klkfhbcb19rre8li.apps.googleusercontent.com&client_secret={secret}&redirect_uri=http://conor1998.web44.net/php/oauth.php&grant_type=authorization_code';
    $url = urlencode($url);
    header('Location: $url');
}


$response = file_get_contents($url);
$response = json_decode($response);



$channel_data = file_get_contents('https://www.googleapis.com/youtube/analytics/v1/reports?ids=channel==mine&start-date=2014-08-01&end-date=2014-09-01&metrics=views&key=AIzaSyDTxvTLWXStUrhzgCDptVUG4dGBCpyL9MY?alt=json');
$channel_data = json_decode($channel_data, true);

echo "<br />";
var_dump($channel_data);
echo "<br />";

I have no idea why it doesn't work. I feel it's mainly due to my goal of trying to get the authentication token for the user so i can grab their YouTube data. Any help would be appreciated

The code you receive from the auth website is not the access token! You have to exchange it for refresh and access tokens (see #4).

You have to perform a POST request to https://accounts.google.com/o/oauth2/token in order to get your tokens. It is not working via GET (as you can see when clicking the link).