PHP MS SQL Server数据库连接不工作

我正在尝试连接我的sql server 2012数据库，但它在我的php页面中显示错误

Connection could not be established.
 Array ( [0] => Array ( [0] => IMSSP [SQLSTATE] => IMSSP [1] 
=> -47 [code] => -47 [2] => An error occurred
 translating the connection string to UTF-16: No
 mapping for the Unicode character exists in the
 target multi-byte code page. [message] => An 
error occurred translating the connection string to 
UTF-16: No mapping for the Unicode character exists in the target multi-byte code page. ) ) 

我正在使用这个代码

<?php


$connectionInfo = array("UID" => "uid", "PWD" => "pass", "Database"=>"db");

$serverName = "(50.97.219.194\25000)";

$conn = sqlsrv_connect( $serverName, $connectionInfo);

if( $conn )
{
     echo "Connection established.\n";
}
else
{
     echo "Connection could not be established.\n";
     die( print_r( sqlsrv_errors(), true));
}


sqlsrv_close( $conn);
?>

---

我无法理解我的代码中有什么错误

能否输出SQL错误。Die实际上没有给出太多细节。它只是表明您无法连接，$conn=mssql\u connect（$serverName，$user，$pass）怎么样？