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
----------------代码如下---------------
. j, z3 x( y, f3 _+ v. Y<?php
$serverName = "(local)";
2 I, x, `( `* C) L  o* i5 k* [7 K( n6 E  $uid ="sa";
/ o- h* P/ y; Z+ U0 }1 ?  $pwd = "mypwd123";
4 D: A9 i! f, K5 N! O
& L3 C4 T. x/ |$ ~3 \) W! y4 c5 ?$connectionInfo = array("UID"=>$uid,"PWD"=>$pwd,"Database"=>"phpdb");

8 z! T2 v  S0 W$conn = sqlsrv_connect( $serverName,$connectionInfo);
6 C1 r$ Q1 N' ?6 M0 I1 n: J  if( $conn == false)
% S- z: u5 \8 h- O  {
  echo "连接失败！";
die( print_r( sqlsrv_errors(), true));
  }
?>
-------------------------------------------------------------------------
8 B9 y+ c# Q2 ^/ s4 N望高手指点迷津
; H1 J2 R9 h! Y. s2 f6 v( }; @
& R- P; d# |9 e' I) Tphp.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
; G5 D% T. S9 H1 a8 i4 a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
( ]+ a- ^+ g* X) smssql.secure_connection = On