To interact with the Kraken Futures API for retrieving the fee schedules and volumes, you can use PHP's built-in functionalities, such as `cURL` or `file_get_contents`. Below is an example of how to do this using `cURL`.

### PHP Example using cURL

```php
<?php

// Function to get fee schedules from Kraken Futures API
function getKrakenFuturesFeeSchedules() {
// API Endpoint URL
$url = 'https://futures.kraken.com/derivatives/api/v3/feeschedules/volumes';

// Initialize cURL session
$ch = curl_init();

// Set cURL options
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); // Return response as a string
curl_setopt($ch, CURLOPT_URL, $url); // Set the URL
curl_setopt($ch, CURLOPT_HTTPGET, true); // Set method to GET

// Execute the cURL request
$response = curl_exec($ch);

// Check for errors
if (curl_errno($ch)) {
echo 'Error: ' . curl_error($ch);
} else {
// Decode JSON response
$data = json_decode($response, true);
// Print the data
print_r($data);
}

// Close cURL session
curl_close($ch);
}

// Call the function
getKrakenFuturesFeeSchedules();

?>
```

### Explanation:
1. **cURL Initialization**: Starts a new session using `curl_init()`.
2. **Setting options**:
- We set `CURLOPT_RETURNTRANSFER` to true to return the transfer as a string, rather than printing it out directly.
- The URL for the API endpoint is specified.
- The method is set to GET using `CURLOPT_HTTPGET`.
3. **Executing the request**: Calling `curl_exec()` sends the request and returns the response.
4. **Error Handling**: If any error occurs during the execution of the request, it will be displayed.
5. **Decoding the Response**: The JSON response from the API is decoded into a PHP array.
6. **Printing the Data**: The decoded JSON data is printed for inspection.
7. **Closing the cURL session**: Finally, the cURL session is closed using `curl_close()`.

### Running the Example
Make sure you have PHP installed on your system and save the above code into a `.php` file. Then, you can run it from the command line or a web server supporting PHP. If you run this script, it will output the fee schedules and volumes data retrieved from the Kraken Futures API.