求教连接数据库问题，win8.1(X64)+IIS+php5.5.23+sqlserver2008R2

曾经的王者

本人新手刚学习PHP，遇到连接SQLSERVER2008R2数据库问题，环境win8.1(X64)+IIS8.5+php5.5.23+sqlserver2008R2(x64)
PHP文件能成功执行，但是执行phpinfo()并未发现sqlsrv，执行数据库连接后提示如下：
3 [$ G( m  Z" ?# z6 H) J7 zPHP Fatal error: Call to undefined function sqlsrv_connect() in E:\wwwroot\php.com\test\2.php on line 11
$ R; I8 n1 q) l----------------代码如下---------------
<?php
3 a1 `( l$ |. D$serverName = "(local)";
  $uid ="sa";
  E' H& f# d8 h" v- Z" a2 @/ f  $pwd = "mypwd123";
& f# ^5 {; j% X6 A
$connectionInfo = array("UID"=>$uid,"PWD"=>$pwd,"Database"=>"phpdb");

- b4 z1 z/ Y1 w: P% |0 d( n) b$conn = sqlsrv_connect( $serverName,$connectionInfo);
  if( $conn == false)
8 |; L5 `  @5 b! o  {
, F! K1 q! ~- R4 S( A3 W* X, W- Y  echo "连接失败！";
die( print_r( sqlsrv_errors(), true));
$ Q2 l! F1 Z1 b. h* n4 o& f  }
?>
-------------------------------------------------------------------------
8 ~  [, N9 p4 @望高手指点迷津
3 @2 K/ z" `  c8 r* l+ t$ [
' X0 \- Y' n/ ?- u1 O* Rphp.net里下载php-5.5.24-nts-Win32-VC11-x64.zip
# p/ ~; {4 @: V' s# k* O$ P1 N5 P微软官网下载 解压SQLSRV32.EXE后，拷贝php_pdo_sqlsrv_55_nts.dll和php_sqlsrv_55_nts.dll 到PHP安装目录ext
并且修改了php.ini的配置文件extension=php_sqlsrv_55_nts.dll   
  extension=php_pdo_sqlsrv_55_nts.dll
& }0 s2 c: n  Q6 d+ xmssql.secure_connection = On