无法连接live sql server？

I had the secured database sql server. I can't access the server using the php file connectivity.

The code

$myServer = "ippaddress";
$myUser = "XXXXXXX";
$myPass = "XXXXXXX";
$myDB = "XXXXXXX";
$conn = mssql_connect($myServer,$myUser,$myPass);
print_r($conn);
if (!$conn) { 
     die('Not connected : ' . mssql_get_last_message());
} 
$db_selected = mssql_select_db($myDB, $conn);
if (!$db_selected) {
    die ('Can\'t use db : ' . mssql_get_last_message());
}

And I tried this format of connect code also

$serverName = "serverName\instanceName"; //serverName\instanceName
$connectionInfo = array( "Database"=>"xxxxxx", "UID"=>"xxxxxx", "PWD"=>"xxxxxx");
$conn = sqlsrv_connect( $serverName, $connectionInfo

Every time I get an error:

page isn’t working" and "co.in is currently unable to handle this request.

Where I made mistake?