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：
PHP Fatal error: Call to undefined function sqlsrv_connect() in E:\wwwroot\php.com\test\2.php on line 11
; _- ?5 N% T1 C. `$ w* z----------------代码如下---------------
2 M# _& O, _6 {0 ~. e5 ^- g<?php
$serverName = "(local)";
" k. F6 t: Z$ g6 w6 t+ i# r  $uid ="sa";
( E6 @7 ]% H! W, B1 J. T  $pwd = "mypwd123";
( L1 f- ^) |. v6 q" z- ~
$connectionInfo = array("UID"=>$uid,"PWD"=>$pwd,"Database"=>"phpdb");

3 i4 V. k& e2 n9 }8 K2 n9 x$conn = sqlsrv_connect( $serverName,$connectionInfo);
' i! l; S( n5 A( q7 O4 m  if( $conn == false)
7 w+ z# I$ T5 ^' H  {
3 H6 i# Q# L: Y' b  echo "连接失败！";
- z( Q' e. N. Y+ \& \die( print_r( sqlsrv_errors(), true));
8 A: n! y* {7 j6 N  }
$ |9 Y2 p: `9 S2 k6 D" X?>
-------------------------------------------------------------------------
* p6 b: O9 s. t0 J  e% M望高手指点迷津
% m) d. q9 O6 t$ U
- `4 O! z3 N1 p0 Jphp.net里下载php-5.5.24-nts-Win32-VC11-x64.zip
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
  c3 d' E& F: _1 l, J并且修改了php.ini的配置文件extension=php_sqlsrv_55_nts.dll   
8 E& p% r/ h  o( [$ l& P6 c, f  extension=php_pdo_sqlsrv_55_nts.dll
7 B) S( |. P& Bmssql.secure_connection = On