PHP学习：php使用sql server验证连接数据库的方法

<?php
$serverName = "(local)";
$uid = 'xxxx';
$pwd = 'xxxx';
$connectionInfo = array( "UID"=>$uid,
                         "PWD"=>$pwd,
                         "Database"=>"AdventureWorks");
 
$conn = sqlsrv_connect( $serverName, $connectionInfo);
if( $conn === false )
{
     echo "无法连接数据库.";
     die( print_r( sqlsrv_errors(), true));
}
 
$tsql = "SELECT CONVERT(varchar(32), SUSER_SNAME())";
$stmt = sqlsrv_query( $conn, $tsql);
if( $stmt === false )
{
     echo "查询错误.";
     die( print_r( sqlsrv_errors(), true));
}
 
$row = sqlsrv_fetch_array($stmt);
echo "登录的用户: ".$row[0];
 
sqlsrv_free_stmt( $stmt);
sqlsrv_close( $conn);
?>