MS-SQL en mySQL connectie in PHP

MS-SQL:

$connectionInfo = array( "Database" => "TheDatabaseName", "UID" => "TheUserName", "PWD" => "ThePassword" );
$conn = sqlsrv_connect( $serverName, $connectionInfo);
if (!$conn) {
     die("Connection failed: " . sqlsrv_errors());
}

mySQL:

$connectionInfo = array( "Database" => "TheDatabaseName", "UID" => "TheUserName", "PWD" => "ThePassword" ); 
$conn = mysqli_connect($DBservername, $connectionInfo);
 if (!$conn) {
     die("Connection failed: " . mysqli_connect_error());
}