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：
' K: e" L) ?1 T$ L8 u6 mPHP Fatal error: Call to undefined function sqlsrv_connect() in E:\wwwroot\php.com\test\2.php on line 11
----------------代码如下---------------
<?php
$serverName = "(local)";
* {  r0 X/ `( G: G& j; w  $uid ="sa";
) n5 ^9 s* c6 A4 t5 t) y# Y; }- f  $pwd = "mypwd123";
* W6 _# {. _; \* r3 {1 E, s
, a# Y" N6 c  m  {( K$connectionInfo = array("UID"=>$uid,"PWD"=>$pwd,"Database"=>"phpdb");
: k# w) R2 K$ J- \  y. v- ]6 a4 f3 J7 L
$conn = sqlsrv_connect( $serverName,$connectionInfo);
2 C; J$ v( x% |! I' c& F! u9 ~1 {  if( $conn == false)
% W  g/ c, {$ K, R) N2 m# `  {
) _1 v" a( I' ]% `5 c& N  echo "连接失败！";
die( print_r( sqlsrv_errors(), true));
) k' q# ?8 A. i4 p, `3 O; S+ L  }
0 `- A" z& {; N  U4 j4 N3 u?>
-------------------------------------------------------------------------
望高手指点迷津

7 l$ |8 p5 o: L* a% Lphp.net里下载php-5.5.24-nts-Win32-VC11-x64.zip
1 l- s- i3 ^1 s. K6 ^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   
: r7 V8 G% ?* T% \3 o& D. u8 r  extension=php_pdo_sqlsrv_55_nts.dll
mssql.secure_connection = On

4 W1 I$ ]8 f8 G1 X1 B# }