php - Timeout and unset 1 query in multi curl

I have php script that send request to the other server.

If the question similar to each other, I using multi curl

try {                                                                
    $result['response'][] = @new SimpleXMLElement($task);               
    $result['request'][] = @new SimpleXMLElement($request);             

} catch (Exception $e) {                                             
    // Showing err
    if ($throwException) {                                              
        throw new Exception('Internal Server Error', 500);            
    }                                                                   
}                                                                    
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If any problem with answer I showing an error.

I want to know:

1) How to understand that it was timeout error or something else?

$cmh = curl_multi_init(); // create only one descriptor
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If I send 5 request, 4 will be ok, and by 1 will be timeout()

2) How to unset only this one request in multi curl?

Thanks!