Exec Addsubdomain and save file

When I exec script below, And php will show save file windows, How close it?
$cpanelusr = ''; //username cpanel
$cpanelpass = ''; //password cpanel
$domainroot = 'XXX.com.tw'; //root domain
$subdomain = 'TEST'; //sudomain
$xmlapi = new xmlapi('localhost'); //link cpanel (can use ip)
//create_subdomain($domain,$xmlapi); //
$xmlapi->set_output('array');
$xmlapi->set_port( 2083 ); //port cpanel
$xmlapi->password_auth($cpanelusr,$cpanelpass);
$xmlapi->set_debug(1); //output actions in the error log 1 for true and 0 false
file_get_contents($xmlapi->api1_query($cpanelusr, 'SubDomain', 'addsubdomain', array($subdomain, $domainroot,0,0, "/public_html/")));