How can you handle the expiration of an access token in PHP when using an API?

When an access token expires while using an API in PHP, you need to implement a mechanism to automatically refresh the token. This can be achieved by checking the expiration time of the token before making a request to the API. If the token is expired, you should use the refresh token to obtain a new access token and update your authentication headers.

// Check if access token is expired
if ($tokenExpiration < time()) {
    // Use refresh token to get a new access token
    $newAccessToken = getNewAccessToken($refreshToken);
    
    // Update authentication headers with the new access token
    $headers = [
        'Authorization: Bearer ' . $newAccessToken,
        'Content-Type: application/json'
    ];
}

// Make API request with updated authentication headers
$response = makeApiRequest($url, $headers);