Facebook oauth rest api使用opencart重定向uri问题

<?php
  $client_id = APP_ID; // Client ID
  $client_secret = APP_SECRET; // Client secret
  $redirect_uri = 'https://example.com/facebook-login/index.php'; // Redirect URIs

  $url = 'https://www.facebook.com/v2.9/dialog/oauth';
    
    $params = array(
        'client_id'     => $client_id,
        'redirect_uri'  => $redirect_uri,
        'response_type' => 'code',
        'scope'         => 'email'
    );

    if (isset($_GET['code'])) {

        $params = array(
            'client_id'     => $client_id,
            'redirect_uri'  => $redirect_uri,
            'client_secret' => $client_secret,
            'code'          => $_GET['code']
        );
    
        $url = 'https://graph.facebook.com/oauth/access_token';

        $curl = curl_init();
        curl_setopt($curl, CURLOPT_URL, $url);
        curl_setopt($curl, CURLOPT_POST, 1);
        curl_setopt($curl, CURLOPT_POSTFIELDS, urldecode(http_build_query($params)));
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
        $result = curl_exec($curl);
        curl_close($curl);
        $tokenInfo = json_decode($result, true);
        
        echo '<pre>';
        print_r($tokenInfo);
        echo '</pre>';

        if (count($tokenInfo) > 0 && isset($tokenInfo['access_token'])) {
            $params = array('access_token' => $tokenInfo['access_token']);
            $params = array(
                'fields' => 'id,name,email', 
                'access_token' => $tokenInfo['access_token']
            );
    
            $userInfo = json_decode(file_get_contents('https://graph.facebook.com/me' . '?' . urldecode(http_build_query($params))), true);
    
            if (isset($userInfo['id'])) {
                echo '<pre>';
                print_r($userInfo);
                echo '</pre>';
            }
        }

    } else {
        
        $loginUrl = $url . '?' . urldecode(http_build_query($params));
        header('Location: ' . filter_var($loginUrl, FILTER_SANITIZE_URL));
    }