php 连接sqlserver方法

<?php

$type = $_GET["tp"];
$param =$_GET["prm"];

if( isset($_GET["tp"]) &&isset ($_GET["prm"]) )
{
    $userInfo=new UserInfo();
    if($type=="select" && $param== "all")
        echo $userInfo->SelectAll();
        
}

class UserInfo
{

    public function SelectAll()
    {
        $serverName = "192.168.1.8"; //数据库服务器地址
        $uid = "sa"; //数据库用户名
        $pwd = "1234?"; //数据库密码
        $connectionInfo = array("UID"=>$uid, "PWD"=>$pwd, "Database"=>"DB");
        $conn = sqlsrv_connect( $serverName, $connectionInfo);
        
        if( $conn == false)
        {
            echo "连接失败！";
            die( print_r( sqlsrv_errors(), true));
        }
        
        $res="";
        $query = sqlsrv_query($conn, "select * from UserInfo");
        while($row = sqlsrv_fetch_array($query))
        {
          $res.=$row[0].",".$row[1]."|";
        }
        return $res;
    }

}
?>