What are common issues when handling Facebook access tokens in PHP?

Issue: Common issues when handling Facebook access tokens in PHP include not securely storing the tokens, exposing them in URLs or logs, and not properly validating the tokens before using them. Solution: To securely store Facebook access tokens, consider using environment variables or a secure configuration file outside of the web root. Avoid passing tokens in URLs and ensure they are not logged in plaintext. Always validate tokens before using them to prevent unauthorized access.

// Store the Facebook access token securely
$accessToken = getenv('FACEBOOK_ACCESS_TOKEN');

// Do not expose the token in URLs or logs
// Validate the token before using it
if ($accessToken) {
    // Proceed with using the access token
} else {
    // Handle error or prompt for token input
}