I have a error to pass the searchterm value in ENOM API calls

I declared the variable "$sld" in check the domain is available or not. The domain checking code as follows

public function domaincheck(Request $request)
{
    ini_set('max_execution_time', 300);
    //set_time_limit(300);
        $sld = $request['sld'];
        $tld = $request['tld'];
        $response = file_get_contents('https://resellertest.enom.com/interface.asp?command=check&sld='. $sld .'&tld='. $tld .'&uid=resellid&pw=resellpw&responsetype=xml');  
        $data = simplexml_load_string($response);
        $configdata   = json_encode($data);
        $final_data = json_decode($configdata,true);

     <!--Domain Name Suggestions --> 
      $response1 = file_get_contents('http://resellertest.enom.com/interface.asp?command=GETNAMESUGGESTIONS&uid=resellid&pw=resellpw&SearchTerm='. $sld .'&MaxResults=5&ResponseType=XML');       
        $data1 = simplexml_load_string($response1);
        $configdata1   = json_encode($data1);
        $final_data1 = json_decode($configdata1,true);
}

Here I declared the variable $sld for the first api url and i need to pass the search term value for $sld variable in the second api url (SearchTerm). If i pass the $sld variable in the url I got an error "searchterm is missing" Please suggest any solutions

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