如何重新生成Facebook应用程序的长期访问令牌

<?php
$short_lived_access_token = 'YOUR_SHORT_LIVED_ACCESS_TOKEN';
$app_id = 'YOUR_APP_ID';
$app_secret = 'YOUR_APP_SECRET';

$url = "https://graph.facebook.com/oauth/access_token";
$params = array(
    'grant_type' => 'fb_exchange_token',
    'client_id' => $app_id,
    'client_secret' => $app_secret,
    'fb_exchange_token' => $short_lived_access_token
);

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($params));
$response = curl_exec($ch);
curl_close($ch);

$result = json_decode($response, true);
$long_lived_access_token = $result['access_token'];

echo "Long-lived access token: " . $long_lived_access_token;
?>