[求助]SQL SEVER 与 PHP怎么连接

<?
$connection = mssql_connect ("JUNJIE-F1B876E5","junjie","ma123456");
if($connection)
echo"成功";
else
echo"失败" ;
?>
运行后显示：调试错误：PHPDocument1 行 2 - Call to undefined function: mssql_connect()