Why Does Facebook PHP SDK\'s `getUser()` Always Return 0?

Why is Facebook PHP SDK getUser() Always Returning 0?

In the process of authenticating users for a Facebook-integrated website, it's crucial for the PHP SDK's getUser() function to return the correct user ID. However, some developers encounter an issue where this function consistently returns 0, even after the user authorizes the app.

Understanding the Problem

The function checks the $_REQUEST superglobal for the code parameter, which is set by Facebook after authorization. However, in certain environments, the $_REQUEST superglobal may not be merged properly with $_GET, $_POST, and $_COOKIE.

Solution

One solution is to manually merge these superglobals into a new variable, as shown in the modified getCode() function below:

protected function getCode() {
    $server_info = array_merge($_GET, $_POST, $_COOKIE);

    if (isset($server_info['code'])) {
        // Rest of the function logic...
    }
}

Additional Considerations

In addition to the getCode() fix, it's important to ensure that the following settings are correctly configured in the Facebook Developers Portal:

• Site URL: The URL where the app is hosted
• Site Domain: The domain of the website, without subdomains

These settings help Facebook to identify the authorized app and redirect users to the correct location after authorization.

Conclusion

By merging the $_REQUEST superglobal correctly and ensuring accurate settings in the Facebook Developers Portal, developers can resolve the issue where Facebook PHP SDK getUser() returns 0. This allows the website to seamlessly integrate with Facebook and retrieve user information for tailored experiences.

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